New Accel Self-Learning Module For Fuel Injected Harley-Davidson. Just Plug And Ride.

accelselflearningmoduleAfter 4 years of development and testing, Accel a division of Prestolite Performance, specializing in high quality ignition and electrical components for American made Harley-Davidson motorcycles, is about to release next week the SLM EFI Module. This self-learning technology compensates for changing loads, weather conditions and altitude while you ride. It automatically re-calibrates and optimizes after modifications you made on your bike,  such as exhaust pipes, intake, air cleaners, cams, etc.. Objective of this module is also to improve your mileage while increasing power and torque for both stock and modified applications and to reduce emissions.

Installation is just a direct plug-in connection to your factory Throttle Position Sensor, Crank Position Sensor & O2 Sensors. The module is named “Self Learning” because it acts automatically to compensate for changing loads, weather conditions and altitude while you ride. You guessed it, no more need for costly dyno tuning sessions or downloading calibration files to a laptop. The Accel SLM Module will also help your engine run smoother, eliminating the “bang & pop” associated with mis-programmed ECU due to the intake and exhaust modifications you made in your garage or shop.  and no need to re-flash the factory ECU; simply plug it in and ride.

Available next week at J&P Cycles (retail clients), Drag Specialties, Motorcycle Storehouse, Zodiac in Europe (dealers). More distributors coming soon. Accel Motorcycle Products.

119 Responses to “New Accel Self-Learning Module For Fuel Injected Harley-Davidson. Just Plug And Ride.”

  1. 1 A 1 cycles Jun 25th, 2009 at 11:26 am

    so how do you get a narrow band 02 sensor to do wide band theoughout the rpm and throttle range? im puzzled, the harley o2 sensor only feeds the ecu at partial load and steady state conditions…so how is it feeding the ecu? just would like to know

  2. 2 Grayhawk Jun 25th, 2009 at 11:53 am

    A-1 first time I have seen this product and have no details other than whats posted above but could it be just reading a range change and then a sending signal to/confusing the CPU to compensate similar to an early power commander ? But it would be something if a plug in would be better than a complete mapped set up thru-out the rpm range for a given unit but do not think so.


  3. 3 A 1 cycles Jun 25th, 2009 at 12:20 pm

    power commanders only know what you put in..analog map. x and y dimmenssions, throttle posistion and rpm. then by a given map changes the signal AFTER the ecu to the injectors, adjusting up or down percentage based signal to lengthen the pulse at the injector or to shorten it..if this thing really works i have a 30,000 dollar dyno for sale cheap.

  4. 4 Cadillac Joe D. Jun 25th, 2009 at 2:29 pm

    Hello…..Joe D. here. National Sales Manager for ACCEL Motorcycle Products. Here is an expanation that will hopefully answer your question.

    The SLM-01 and SLM-02 modules require the installation of a narrow-band O2 sensor for input data for the SLM module only,

    The factory ECU is not seeing the input signals from the O2 sensor when a SLM-01 and SLM-02 are installed with an open/loop ECU.

    The SLM-03 , SLM-04 , SLM-O5 which utilize the factories narrow-band O2 sensors as a input to the SLM module at all times from closed throttle to wide open throttle.

    The stock ECU that is equipped with narrow-band O2 sensors may use the input signals at certain RPM and throttle angles based on the factories pre set calibration files.

    The stock ECU is still seeing the input signals which are being generated by the narrow-band O2 sensors.The factories narrow-band O2 sensors are constantly producing output voltage signals which are seen by the the stock ECU and the SLM-03,SLM-04,SLM-05.

    These O2 sensor input signals are utilized along with the factories pre set calibration files which are determined by load and throttle angle along with the additional input signals from the MAP-sensor,TPS-sensor,CRANK-sensor,AIR-TEMP-sensor,HEAD-TEMP-sensor,and ION-sensing (spark-control).

    The narrow-band O2 sensors are still producing voltage readings throughout the complete RPM range from closed throttle to wide open throttle which at most times the reading may fluxuate from a RICH to LEAN reading or at times may be producing a LONG-term RICH or LONG-term LEAN reading which the SLM module is required to see as a valuable input read to the SLM module.

    The SLM module will work with aftermarket stand-alone ECU’s that are using factories narrow-band O2 sensors.

    The demand for a SLM module for use with wide-band O2 sensors has not been great enough to program a module and harness connector assembly for that application.The after market stand-alone wide-band O2 sensor ECU’s are stated as being self-tuning systems.

  5. 5 A 1 cycles Jun 25th, 2009 at 2:50 pm

    so to be self tuning you need to buy 2 new sensors? correct? not just plug this into your harley, its hard to decipher, so do you keep your harley o2 sensors and add two more on top of that? for front and rear cyclinders

  6. 6 A 1 cycles Jun 25th, 2009 at 4:28 pm

    and another problem with self learning modules is that an exhuast leak or intake leak will make the unit tune itslef out of range untill you are stuck on the side of the road, a preset program will not tune itself out of running ability..just being the devils advocate…please send me one so i can try it.

  7. 7 cadillac Joe D Jun 26th, 2009 at 6:24 am

    This uses the stock 02 sensors.

    The info from the 02 sensors is only part of the overall information the unit uses to “self learn”. An exhaust leak would not leave you stucon the road side. Plus, if you feared something like that happening:
    #1 – You must have one hell of an exhaust leaks and should mostly pull over before you burn a valve or something anyway.

    #2 – You can very easily disable the unit simply by unpluging the couple of “plug and play” connections and continue driving if you had some fear that it would leave you stuck…AGAIN, THAT WOULD NOT HAPPEN.

  8. 8 Rogue Jun 26th, 2009 at 7:16 am

    Does this unit work with Throttle By Wire Harley’s?

  9. 9 Jim C Jun 26th, 2009 at 7:40 am

    An automotive system uses a narrow band O2 sensor system that works very well-so why shouldn’t it be the same with a motorcycle. A car will run with a severe exhaust leak,tho it is not a self learning system. Like Joe said a narrow band O2 sensor still reads thoughout the rpm range. The only thing about the narrow band is that it can not compensate for a vehicle that is running way rich or lean.
    The bigger question is what is the price point?

  10. 10 Mike Kiwi Tomas, Kiwi Indian Motorcycles Jun 26th, 2009 at 7:56 am

    Certainly no offense to anyone but every unit sold on the market that has been sold as self learning has come up deficient in some cases. We dyno many bikes that customers have bought a plug and play unit and none yet are as stated. By no means am I criticizing this particular unit however we as industry leaders need to address issues like this and be truthful. Likewise with all the exhaust, aircleaner and bolt on performance power increases promises that are not so. Most are bullocks yet we are left to explain to the customer why it came up far short. Maybe one day things will be plug and play but as long as empty promises are made dyno’s will be around for a while yet. As responsible Americans and mototcycle industry leaders we should be honest.

  11. 11 Jim Jun 26th, 2009 at 12:30 pm

    How does this differ from the Head Quarters Pro Tuner, can I ask, Joe?

  12. 12 joe d Jun 27th, 2009 at 7:14 am

    To Rogue – Yes, throttle by wire no problem. Go to to see more info.

    To Kiwi – For a guy that doesn’t want to offend anyone, you do a pretty good job implying that we are not being honest.

    This unit is not going to be everything to everyone.

    We state that clearly in the literature and instructions.

    The constraint with any of these “piggyback” systems is the ECU it is controling. If you put this on a totally radical application where the ECU is not adequate, the SLM can only adjust as far the ECU can go, hense, it isn’t going to compensate for such performance mods.

    In that case, you would need to go with a stand alone performance ECU. Something we have in development by the way.

    The SLM will be a complimentry component to most street bikes out there today with mild modifications..

    Send me your e-mail address and I will send you the literature if you like. Go to to find my contact info and call me anytime.

    Jim – The difference in the headquarters vs. SLM I do not know at this time.


  13. 13 A 1 cycles Jun 27th, 2009 at 8:09 am

    hey joe. rmember me from massachussettes, you worked for weld wheels, glad to see your still in the business, the original press release never said the unit wasnt for “totaly radical applications” but will work on “most street bikes” the harley ecu doesnt have a very big range of adjustment so if you increase your motors volumetric efficiency (v.e.) more than 15% and your riding in new england fall weather your going to very lean. but im sure your product is better than those little boxes with 3 trim screws to cover 6500 rpm. cant wait to try one.

  14. 14 Mike Kiwi Tomas, Kiwi Indian M/C Co Jun 27th, 2009 at 10:10 am

    Joe d, In no way do I want to imply that what you are selling is anything less than what your claims are. Clients spend in many cases some very good money for performance or bolt on products that claim to do great things but when the bike is placed on the dyno they do very little therefore the service techs are left to try and explain to the customer or justify billing their time to sort things out. Unfortunately in many cases many learn as you/plug and play modules do come up short of their promises. On the other hand manufacturers want to cut out the service tech/dyno guy but it still seem a necessary tool when it is not plug and play or when the customer wants proof of the results. Keep up the great work.

  15. 15 James (Kiwi) Jun 29th, 2009 at 3:14 am

    Hey Joe, (was’nt that a song or
    I sincerely hope this is a good product and does as advertised,but what is the RRP? if it is not too expensive as does as you say it will be a big seller

    James (kiwi)

  16. 16 James (Kiwi) Jun 29th, 2009 at 3:21 am

    Ps if you want one tested in the pollution and bullshit free air of New Zealand on a late model HD I would be keen.
    well maybe the bullshit free was streaching it a bit!!

    James (kiwi)

  17. 17 Cadillac Joe D. Jun 29th, 2009 at 8:28 am

    Hey Big Chief (Mike Thomas)…..we are simply saying that the dyno tuning is absolutely necessary to make the bike run good.

    However, for the person that wants to obtain every usable horse for their performance $$$$$$, they should of course put the bike on the Dyno.

    As we all know (or should know), their are numerous factors that can effect horse power and torque numbers to the rear wheel…………..even tire pressure, belt adjustment, etc.

    The SLM not withstanding, there are still many good reasons to dyno your bike if you are serious about performance.

  18. 18 WC Larry Jun 29th, 2009 at 6:13 pm

    What can you tell me about the Head Quarters Pro Tuner, how does it work? Where can I find out more about it?

  19. 19 Brad K Jul 1st, 2009 at 1:07 pm

    Where do you get these and what is the cost, I have called three so called dealers for it and no one even knows what it is??

  20. 20 David 2006 V-Rod Jul 9th, 2009 at 9:17 pm

    In the car word, the ECM takes inputs from the Mass Air, Throttle position, engine temp… sensors and opens the injectors to try to maintain a 14.7 air to fuel ratio. Then the O2 sensor is looked at as a feedback to see if it was rich or lean. The ECM constantly adjusts to get the perfect A/F ratio all the time. I can’t believe that my 2006 V-Rod had a “Dumb Fuel Injection system”. Dyno tuning is great for those specific conditions, but it is like being locked in to a certain set of jets in a carburetor. Will this device create a feedback loop that lets the ECM know if it is correctly managing the fuel injectors?

  21. 21 Hogmaster Jul 22nd, 2009 at 12:18 pm

    Just would like to comment here, I have been installing these units for for a couple of years now and have had great success with their performance. Recently I have also used camshafts matching certain specifications designed by the SLM people. Our Dyno testing showed 30 percent gains in performance and in most cases increased fuel mileage. 15 sets were installed last year and all customers are completely satisfied. I have urged them to post their comments here. this is a great product and doe’s exactly what it claims to do. Performance enthusiast and H-D certified technician
    since 1978 I have used so many so called remedies for the fuel injected Harleys and thankfully now have found a product my customers are happy with.

  22. 22 1 eyed rat Jul 23rd, 2009 at 8:38 am

    I’ve had the SLM EFI module and the camshafts installed by Hogmaster for about a year.The performance increase was better than I expected but right in line with what Hogmaster said it would be.The fuel mileage increase was a pleasent surprize.
    Most times you are promised one thing and it ends up falling short. I have a whole shelf lined with products that didn’t live up to the hype..These products delivered what they claimed and more.

  23. 23 Lugan Al Jul 24th, 2009 at 6:29 am

    Had a SLM EFI module installed on my 2002 Road King back in 2007. Previously was running a Power Commander with stock cams and 95″ kit and modified heads,stock headers and Samson slipon mufflers 90hp on the Dyno, ran OK, good power, bad gas milage and poping on deceleration. In 2007
    had Andrews 44g cams and the SLM EFI module installed everything else stayed the same.First thing I noticed was
    the torque out of the hole and power accross the hole power band and gas milage increase. The gas milage incease
    was much needed as especially riding out to Stugis every year. She road fine in the heat,cold, and at different elevation with out a cough or pop. Some day when I by a new bike 2009 or later the SLM EFI module will be my first
    accessory I will install.

  24. 24 BAGMAN2 Jul 25th, 2009 at 10:26 am

    I to have the slm tuner it is the bomb, my 01 roadking was running so lean i was thinking it would melt down in the hot weather, i to have slm cams and mild mods 88in it is everything they say it is and they back it, hogmasters you are correct, i go up hill grades with no drop in speed it calibrates look at your spark plugs before,then check them after 50-75 miles mine were white before now a nice tan color thanks hogmaster for doing the cams etc running great over 80 hp BAGMAN

  25. 25 K Nash Jul 28th, 2009 at 10:59 am

    My uncle called me and told me about Hogmasters slm efi module.He rides an 07 nightrain with the cams and module and loves it.So in order to keep the old fat dude (lol) behind me ,I talked to hogmaster and had cams and a module added to my o6 dyna wide glide.I already had reinhart exhaust.I also added a sreaming eagle air cleaner.What a difference!But I have had 2 problems that i’ve had to deal with(well maybe they aren’t problems)The first is keeping the front wheel on the ground and the second is my back tire is getting bald.But I can live with that as long as the old dude is behind me.I don’t take my uncle’s advice often but this time I’m glad I did.Harleys are pigs stock.But with the slm tuner and the cams they installed I’m smiling bigger that ever

  26. 26 BubbaRon Jul 28th, 2009 at 9:50 pm

    Hogmasters installed the slm efi module and cam shaft one year ago…All I can say is WOW my bike runs like a Raped Ape…I have a 03 road king with ape hangers. most look at my bike and laugh untill all they see is tail lights. Im a big guy so the front wheel only comes up once in a full moon or so…lol.. but burn outs are awesome. If you want real performance get this product.

  27. 27 Maggot Jul 29th, 2009 at 8:58 pm

    I was kinda skeptical at first when Ralphie at Hogmasters wanted to install the SLM and some new bigger cams on my 07 Softail, but now I don’t need sixth gear until I’m past 75 MPH. Needless to say, some of the boys were takin’ a real close look at me and my Softail, but except for the drag pipes, everything looks stock. Thanks Ralphie.

  28. 28 Charger Sep 1st, 2009 at 11:03 pm

    Hey I thought this product just came out? Was it pre-released to certian shops for testing? Who is Hogmasters do they have a website? This product sounds good!! Regards

  29. 29 Hogmaster Sep 4th, 2009 at 10:12 pm

    I have been testing theses units for a few years now. Greatest thing since buttered bread.
    Just finisned a CVO 103 2003 FLHTC cams and computer. It had a power comander and wouldnt run cold for anything. Since installing our conversion cams and SLM unit the engine performs great cold.
    Overall performance is fantastic. The owner will post his evaluation soon.

  30. 30 bryan Sep 6th, 2009 at 9:30 am

    Had my SLM installed a few weeks ago and finally got a chance to get out for more than ten minutes last weekend. I have an 04 softail standard, vance and hines longshots, .256 cams. I’m lovin this thing. After the cams were installed there were minor issues with harleys map program….those are gone, after cams installed I lost some fuel mileage… it back. Next step is SLM cams will let you know what happens after that.

  31. 31 Jim Sep 22nd, 2009 at 5:30 am

    Hi again Joe.

    Do you yet have any info on how this unit differs from the Head Quarters Pro Tuner? As it’s a device that is for the same purpose from a well known tuner, I’m surprised you don’t know the opposition, so to speak… MIne is a genuine inquiry – I am interested, but I’d like some sort of comparison.



  32. 32 Jim Sep 22nd, 2009 at 5:45 am

    WC Larry:

    The Head Quarters Pro Tuner sounds as if it works just like the SLM – connects in exactly the same locations, and it’s a similar sized little black box, and a similar price. If I understand correctly, it monitors the AFR at all times and keeps it to a predetermined value. Just Google to find out about it.


  33. 33 Hogmaster Sep 22nd, 2009 at 3:43 pm

    I Made cams for Doug at Andrews products. Nice people good stuff. Not familiar with his Pro Tuner but I have been installing these for 4 almost 5 years. These are an original design as far as I know the persons who wish to remain anonymous for legal reasons are the real brains behind this technology. I think this is an awesome product and use them quite frequently. Most of these responses are my customers who I have asked to post their experiences with the SLM. Who cares If they are similar! do HeadQuarters units give the same results? Not being Facetious but I have not known anyone who has used one.

  34. 34 Phil L Sep 24th, 2009 at 10:26 am

    I decided to go with the Accel SLM at the same time I had the AN big sucker installed on my 2009 Ultra. One week later I replaced the standard mufflers with Rinehart slip-ons. I now have about 1K miles on the bike after installing the upgrades and I am seeing some discoloration (yellow / gold / brown) on the exhaust pipes between the heads and where the pipes combine. The throttle response is vastly improved but I am concerned about the long term affect of running leaner/hotter.

  35. 35 Phil L Sep 24th, 2009 at 10:35 am

    Apart from the concern with discoloration (noted above), I am getting some “coughing and popping” sounds on deceleration that I did not notice before and wondering if others have had this experience after installing the Accel SLM.

  36. 36 Hogmaster Sep 24th, 2009 at 4:41 pm

    Phil, How many miles were on the bike when you installed the SLM? Have you tried to disconnect and reconnect your battery? Sometimes you need to do that to clear previous memory in the ECU. I have installed many of these units and never any too lean. I have bikes on the street with big motors with compression and cams with no lean condition issues. Gold on and exhaust pipe is not a real concern they all turn color unless they are coated internally. Gold is not blue. Blue would be a concern.

  37. 37 Rich Sep 24th, 2009 at 6:55 pm

    I would like to commet on the SLM. I had it installed about two months ago. It works just as good as I was told it would on my 2009 FLHTCU. I have put over 4,000 miles on it so far. It has great response to the throttle with out any delay. It also gives me greater gas mileage compared to other FLHTCU’S that I went on trps with they were the same year as mine. It also seems like the bike runs a little cooler. If anyone is thinking of getting one I highly recommed doing so. I ride with a group called the P.O.E.T.S. and alot of them are going to get the SLM put on there bikes too.

  38. 38 Phil L Sep 24th, 2009 at 7:11 pm

    Hogmaster – thank you for your comments. I had roughly 7K miles on my Ultra when I had the upgrades installed, including the SLM and, yes, I have disconnected the power from the battery twice since I had it installed (to connect battery tender leads and a security system). Based on your comments and others, I am not going to worry about the discoloration. Any thoughts on what I can do to eliminate the decel popping?

  39. 39 Hogmaster Sep 25th, 2009 at 10:20 am

    Phil, It is possible you may have an exhaust leak. I would check the muffler clamps to make sure they are tight. remove the brackets behind your saddle bags and see if the mufflers move on the head pipe. I have found this to be a problem and I use sealer on the connection permatex hi temp exhaust sealer works very well.

  40. 40 Hogmaster Sep 25th, 2009 at 10:41 am

    Phil, One other thing.Tr y closing the throttle quickly on deceleration.
    Injected engines respond differently than carburetor engine rolling the throttle back can cause a slight popping. You can do this before checking the exhaust.

  41. 41 Richie Sep 26th, 2009 at 9:00 am

    Ralph installed an SLM on my 2001 Softail before I went on my annual trip to Sturgis. I have 211 cams,Screamin Eagle heads and Rhinehart exhaust. What a difference. The engine not only performs flawlessly but it even seems smoother. My fuel mileage improved and . my oil stayed clean longer. The engine even sounds better My brother had Ralph do his 103 as soon as we got back .
    A few of my other friends have also had the SLM’s installed since. I had Many trips to Harley and the dyno with my race tuner they never got it dialed in like this. Im their new best salesman.

  42. 42 Phil L Oct 1st, 2009 at 6:50 pm

    Hogmaster, I am getting ready to have the SE204 camshaft installed on my 2009 Ultra Classic, which will be a good test for the Accel SLM. Since no mapping will be required and I have a set of the quick install, adjustable pushrods, how much time is normally required for an experienced mechanic to complete the camshaft installation?

  43. 43 Hogmaster Oct 2nd, 2009 at 11:38 am

    Phil, The 204 cams are .508 lift nice bolt in cam. If you read some of The earlier posts here I have been installing camshafts with the SLM module for a couple of years now .Accel has 6 of 10 different profile camshafts specifically designed to work with fuel injected twin cam engines. We have had 30 percent plus gains and still retain good fuel mileage. They have a specific grind for the 96″ engine.
    .535 lift with a 33 degree intake closing great for improved torque. The 204 cams close at 34 degrees and have more duration this will give you a later power band with torque in a higher RPM range. A heavy bike needs its torque down low to provide more pulling power. To perform this job with the adjustable pushrods your looking at approximately 4-5 hours depending on the exhaust. No dyno time required. We do cam installations more than anything else in the shop. Cams are going to give you the biggest performance gain combined with the SLM and a good set of pipes you’ll think you you gained a couple cylinders. SLM cams are 4340 billet steel ground on a CNC Landis machine that costs over a million dollars. This is the most accurate piece of cam grinding equipment in the world and the operator has over 30 years experience. Best piece money can buy. I highly recommend them.

  44. 44 Hogmaster Oct 2nd, 2009 at 2:51 pm

    Phil, what I forgot to mention the SLM cams are all American steel and made right here. Product of the USA.

  45. 45 Phil L Oct 2nd, 2009 at 4:47 pm

    Hogmaster, thank you for your comments (as always). The 204 cams were installed today and I cannot believe the improvement in acceleration. And, the sound is awesome. Question: how long does the SLM take to readjust to the change with the cams? I have only driven the bike home from the dealership (15 miles). It accelerates great and the bang and popping I was getting before the cam installation on decel is GONE. I suppose it could have been a leak in the exhaust (as you suggested) that was corrected when they reinstalled the headers. The only negative that I have noticed (at this early stage) is some hesitation in throttle response from a dead stop. I am wondering if the SLM is still trying to adjust to the new system. Any thoughts? Have any of your customers experienced the “hesitation” immediately after installing cams?

  46. 46 Hogmaster Oct 2nd, 2009 at 10:20 pm

    Phil, Im sure your pleased with the performance of your Bike with cam installed. That is what these Twin Cam engines need to reach their potential. We really haven’t had customers complain about throttle response. Give it a few miles and see if it improves. Throttle by wire bikes are typically s bit slower to respond because of the nature of the unit. If you do dyno your bike let me know what kind of numbers you get with the 204’s. I wish we could have got you a set of the SLM 96″ cams. Have fun and watch out for Cops.

  47. 47 Hogmaster Oct 7th, 2009 at 10:01 am

    Phil, Did you get some miles on your bike?do you like it.

  48. 48 Phil L Oct 8th, 2009 at 4:59 am

    Hogmaster, the cams are great but I am still having issues with the SLM when accelerating from 0% throttle. Accel is trying to resolve the issue.

  49. 49 Hogmaster Oct 9th, 2009 at 12:27 am

    Phil, I have installed many sets of Cams with the SLM modules I havent had any issues with throttle response. What did the installer think of the performance. something as simple as a set of spark plugs could be an issue. 4164 autolite’s have been my plug of choice. What about the popping is it gone? There are a lot of things that could throw off a tune up. I would check the compression and drain the crankcase to see if there is an abnormal of oil in it you should only get a few ounces. More than that could be another problem. A compression test is the best way to determine if their is a real problem. Go to they have a trouble shooting section that will show you how compression effects your engines performance. I wouldnt be to quick to blame the SLM swapping it may not solve your problem. I would like to help you with this problem. I have complete confidence in this product and a few years experience installing them on a variety of combination’s Keep me informed

  50. 50 Phil L Oct 9th, 2009 at 5:30 am

    Hogmaster, thank you for your ongoing interest and offer to assist with the problem I am having. Basically, I am getting a “flat spot” between 0% throttle and 1,500 rpm. I am going to take my bike back to the HD dearlership that installed my cams to run some checks (as you have suggested). Thanks again. I will keep you posted.

  51. 51 Jim Oct 12th, 2009 at 6:37 am

    Joe, does the SLM adjust timing, or just the AFR?

  52. 52 Hogmaster Oct 12th, 2009 at 3:11 pm

    Hi Jim, I know a little about these units. I have been using them for a few years now. Information from the SLM sent back to the ECU is evaluated and possessed the ecu will make the timing changes according to the information it recieved. Yes essentially it doe’s.

  53. 53 Jim Oct 13th, 2009 at 1:38 pm

    Thanks Joe.

  54. 54 Hogmaster Oct 13th, 2009 at 7:50 pm

    Your welcome Jim.

  55. 55 Gary Oct 16th, 2009 at 3:43 pm

    I was wanting to see if anyone has used this setup with a procharger supercharger? I just purchased one for my 09 Streetglide and i dont want to use the power commander supplied with the lit. Thanks

  56. 56 Gary Oct 16th, 2009 at 3:44 pm


  57. 57 Hogmaster Oct 18th, 2009 at 7:19 pm

    Jim, Are you planing any other modifications to your engine? I have used the SLM with Nitrous and had excellent results. Are you planing to do a cam change for the supercharger? What heads do you have are they stock ? How many cubic inch 96,103 or 110. A camshaft specifically designed for a supercharger would make a huge difference. I can help you out with a good cam choice. That is my field of expertise.

  58. 58 Hogmaster Oct 19th, 2009 at 12:20 pm

    Im Sorry, Gary

  59. 59 Gary Oct 19th, 2009 at 3:05 pm

    Everything is stock except for the pipes. I plan on doing some V&H Monster Ovals slip ons. I want to do a cam but for now im going to leave it all stock. The supercharger is for 10 lbs of boost. Will the SLM work with this setup? Thanks Again

  60. 60 Gary Oct 19th, 2009 at 3:06 pm

    96 Inch

  61. 61 Hogmaster Oct 21st, 2009 at 11:40 am

    Gary 10 pounds of boost is a lot for a stock motor. What elevation do you live at? A 96″ Twin Cam engine has slightly over 9-1 compression. I would think 10 pounds of boost at sea level would put your static compression ratio too high for pump gas. You may want to talk to the Pro Charger people about that. There are a few good camshafts that would work well with the SuperCharger and could help with detonation. I would suggest replacing the stock cam.

  62. 62 Tom Nov 15th, 2009 at 6:38 am


    I´ve just put in the SLM-04 tp my 2007 SteretBob, but the self diagnostoc lamp is permanently flashing read and green and I thought it should be off after a few flashes?!?
    Any idea what the reason could be?


  63. 63 Tom Nov 15th, 2009 at 7:19 am

    Sorry.. forget my last post..
    I have read the installation sheet again and everything is fine now.
    I thought the controll lamp on the SLM should stop blink, but it´s the factory FI–Light and this is working fine..
    And after another 90 sec. the LED on the SLM is changing to blink green only when it comes to local loop mode 🙂

  64. 64 Hogmaster Nov 16th, 2009 at 1:09 pm

    Tom How do you like the SLM? The SLM will always flash. After open loop you’ll only flasn green.

  65. 65 Tom Nov 17th, 2009 at 1:23 pm

    As you may probably know, it´s not the best time in Germany to go out for a test ride 🙂
    Hopefully next weekend, but even after starting the engine and let it run a few minutes it sounds better than before with the V&H Fuekpak.
    I´ll send another post after I did my first run, ok?

  66. 66 Tom Nov 19th, 2009 at 7:12 pm

    I had my first ride today and it felt much beter than the Fuelpak 🙂
    Excellent performance …
    No misfire anymore, but still decel popping.
    Do you think this must be an exhaust leak then?
    But than this must be where the exhaust is fixed to the engine because I have the V&H big shots..

  67. 67 Hogmaster Nov 23rd, 2009 at 12:58 pm

    Tom, Did you install new exhaust gaskets when you changed you pipes? Are there connections at the mufflers ? make sure everything is tight. The only time I have experienced decell popping there has been an exhaust leak.. Hogmaster

  68. 68 Tom Nov 24th, 2009 at 12:58 pm

    OK, I´ll ask my dealer. he has installed the big shots..
    Thanks Hogmaster

  69. 69 Hogmaster Nov 24th, 2009 at 2:03 pm

    Tom one other thing, Haave your dealer check the gaskets on your air cleaner also. An air leak at the intake could also cause decell pop. I assume you may have a S/E aie cleaner.
    Good luck. Hogmaster

  70. 70 Tom Nov 28th, 2009 at 9:44 pm

    hmm.. good idea. I have a Forcewinder installed, but this was already before I installed the V&H. So I assume that the possible leak was with the exhaust..

  71. 71 Hogmaster Nov 30th, 2009 at 2:16 pm

    Tom, You could have had an intake leak that did not effect it as much with the stock exhaust.

  72. 72 Wookieman Dec 2nd, 2009 at 3:40 pm

    Guys, i found this on the ACCEL Website, thought you might enjoy it. BTW, it works great on my buddies bikes. I have a Honda w/carb, but I think they will making the SLM for Metric Applications?

  73. 73 Wookieman Dec 2nd, 2009 at 3:41 pm
  74. 74 wilks3 Dec 8th, 2009 at 2:27 am

    Called Accel to see when unit will be out for 2010 Dynas, as H-D changed the plug at O2 sensors in ’10. Guy said Feb, can’t wait!

  75. 75 Kevin Dec 24th, 2009 at 9:40 am

    Listed below is my build. Is in progress. Will not be upgrading further, unless major failure.
    Do not really want the PowerCommander, but limited due to FBW.
    (PowerCommander is a good unit but I would rather keep the closed loop)
    The ThunderMax is still on the 45 days until release (since summer).
    I did not know Accel had the SLM until I searched for plugs and wires.

    Due to multiple items being modified: Would I require an upgrade map (SERT, etc) prior to installing the SLM05?
    I like what I read about the SLM, but would like more information.
    Is the AFR programmable?
    Is there a MAP installed in the SLM?
    If I just plug into current ECU would it be too lean on start up?
    Other information would be appreciated on steps required concerning SLM and my build?

    Crankshaft Trued, Plugged, and Welded
    Left Case Timken Conversion
    Pistons Wisco
    Cylinders 107” Revolution Performance
    Cam Andrews 54HG & Gear Kit
    16/42 238 .555 .165
    43/15 238 .555 .158
    Pushrods Crane Adjustable Chrome Moly
    Rocker Arm Roller Rockers Crane – Stock Ratio
    Feuling (Combo Kits) #7074 – CamPlate, Oil Pump, Lifters
    Exhaust Thunderheader #1054B (2 into 1 Long Style)
    Air Cleaner K&N 63-1122
    Clutch HD Heavy Duty Spring
    Heads Dewey heads. (Pocket Port) 86cc
    Spark Plugs Accel Y2418P
    Plug Wires S/S Ferro-Spiral Core
    Ignition (Zippers ThunderMax, PowerCommander or SLM05)

  76. 76 Hogmaster Dec 30th, 2009 at 3:01 am

    Sorry Kevin I have been out of town for the Holiday. Can you email me back at the Dewey is a friend of mine. He no longer owns the shop. And I am the person who configured the 54 cams when I was working for Andrews Products. The 54’s are mine.
    They were the last cams I done before I left. The 32’s and the 54’s. What is you static compression?
    Those 54’s will work good up to 10-1. What altitude do you live at?
    This is how the SLM operates.
    Information from the SLM sent back to the ECU is evaluated and possessed the ecu will make the timing changes according to the information it received.

  77. 77 rob gutz Jan 25th, 2010 at 11:40 am

    hi hogmaster where can i buy your cams made to go with the slm module? and is their an application for my bike? 1999 FLTHCUI has intake air cleaner v & h pro pipe and mild h.d.s.e. cam and dobeck perfomance ign. module. will this improve what i have and yesi know i will have to exchange ign. modules out. thank you for any available links advice or info. rob gutz

  78. 78 Butch Feb 14th, 2010 at 12:02 pm

    All I know is that I’m saving up to buy one of these! From all I’ve read, this sounds EXACTLY like the type of unit I’ve been waiting for. Can’t wait to buy one and try it with the drag pipe slipons I’ve added to my stock XL1200L Sportster.Then when I can afford it, I’ll try adding the stage one air intake.I’m excited about this!

  79. 79 dave97flhri Feb 21st, 2010 at 3:59 pm

    does this help with all the promlems with the early M&M efi’s ?

  80. 80 Hog Wild of Temple Mar 1st, 2010 at 12:56 pm

    We installed an SLM module on a 96 Evo because there was not a wide selection of fuel management systems available for the early Magneti Marelli bikes. In order to use a Power Commander, the ECM would have to be upgraded to a later model so it was too expensive to be practical.
    After a base run on the Dyno, we installed the SLM and rode it about 50 miles. When we put it back on the Dyno, we saw about 25% increase in HP & torque along with a much better AFR across the board. The HD Classic was like a totally different bike. The throttle response was greatly improved which made it much more enjoyable to ride.
    We have since installed several more SLM modules and have been impressed with the results on modified bikes as well as stock bikes. The dyno graphs show increases in HP and torque so it is not a matter of “it feels a lot stronger and faster”. Bottom line, the SLM lives up to its claims and is quite impressive.

  81. 81 Concreteguy Mar 28th, 2010 at 4:31 pm

    Hi Hogmaster, thanx for all your responses I was on the fence about an slm but not now. I have an 09 roadglide and wonder if I can get the 96 cams for it and what else would I need. Already have se air intake and goin with bassani pipes with slm which I will install. Thanx in advance

  82. 82 Hogmaster Apr 7th, 2010 at 10:36 am

    Contact me thru my Email and I will get you what you need.

  83. 83 Hogmaster Apr 7th, 2010 at 10:37 am
  84. 84 Concreteguy Apr 18th, 2010 at 8:24 pm

    Hey Hogmaster, thanx for the reply and email. I am however at a complete standstill with the bike being that it has been on a lift and in parts at the dealer. Seems that when its hot it makes a banging noise till the clutch is engaged. Had to wait a week for clips or some insane thing, bike has only 600 miles on it. One question I did have though. When I srarted it once it revved real high then came down. Is that normal or some kind of malfunction. Also I wired directly to breaker pane as instructions were way wrong about wiring harness hot both color and location. Is that ok? Thanks Rick

  85. 85 Travis Johnston Apr 23rd, 2010 at 10:03 am

    I have a question in regards to the SLM for my 09′ FXDB. I have put a Vance & Hines staggered short shot set of pipes and a Kuryakyn hyper charger on. I first used a V&H fuel pack to tune the bike with no success, after learning about the SLM i switched, To be honest the SLM is still not working great it has a stutter when holding it at speed (rpm) although it did take care of the decel popping. Is there anyone who has had this problem or even better anyone who knows how to fix it?

  86. 86 Paul G. - ACCEL Motorcycle Apr 23rd, 2010 at 3:40 pm

    Hey Travis, lets see if I can help you with this. I want to run through a few things just to make sure, so bear with me. You have an 09 Dyna, and should be using an SLMO4 correct? You should also be using the switched power source located at pin # 13, which is a white/black wire. Also, please disconnect the battery and double check your connections. I have seen a number of customers that make the correct connections, but the pins on the inside of the weatherpak connectors get bent/crushed, the bike will still run but not effectively. The SLM module needs a minimum of 50 miles to “learn” the combination of components on the bike. Make sure you have driven the bike this many miles and in varying conditions, such as highway miles and street miles. Let me know if any of this helps, you can also reach me at Have a good weekend!

  87. 87 Travis Johnston Apr 24th, 2010 at 11:01 am

    Hey Paul,
    I am using the slm04, with it connected to pin #13. I am going to disconnect the battery again and double check all of the connections just to be sure that the pins are not bent/crushed. I was riding the bike into work this A.M and actually noticed that the engine light is staying on all of the time now..? I will have time to ride tomorrow and get some miles on it so was planing to disconnect and start fresh then. thanks alot for the help. I’ll let you know how it goes!

  88. 88 Tom Apr 25th, 2010 at 5:44 am

    I still had problems with decel popping. And strange vibrations through acceleration.
    Last week I asked my mechs to check everything like leaks in in and outtake etc.

    They found nothing, but they found an error P0122 TPS1 Low.

    After disabling the SLM everything went to normal without that error (of course.. its running to lean…).
    With the SLM active, the error is popping up after a short period of time..

    They did some resets and after a reset the engine is running well until the error came back again 🙁

    They actually have the same problem on 2 dynas, 2007 and 2008 modells.

    Any idea how to solve?

    Otherwise my dealer wants to replace it by another system 🙁

  89. 89 Tom Apr 25th, 2010 at 5:49 am

    Hi Travis,

    sounds a bit like my problem..
    Have you checked the errorcodes?
    Maybe you have the same error I´m having actually?

  90. 90 Kevin Apr 29th, 2010 at 4:50 am

    I am in no way affiliated with Accel, just a customer. I have a 2008 FLHT and the list of modifications is under Kevin (Dec 24). The SLM05 instructions advised to have the bike tuned due to multiple modifications prior to installation. While I had been told the SLM05 would adjust and a separate tune not necessary, I decided to have a custom map created (116/103) using the Super Tuner. I rode the bike for a couple of weeks after the tune. Highway 41mpg, City 37mpg. Installed my SLM05 and rode about 400 miles. Bike went back on the dyno, just for a compared run (obviously different days and conditions) 117/102. Highway 46mpg, City 42mpg. By the way city driving is twisting the throttle and smiling.

    Installation was fairly simple, instructions good, but would like to have some of the wire lengths extended, especially the throttle position sensor between the male and female conntections. My K&N air cleaner kit exposes both connections since the wiring is so short and not able to be tucked up and under the gas tank. Due to the wiring length I placed the unit in the wiring harness on the gas tank. The SLM05 unit’s plastic edges are very sharp and cut into a preexisting wire. With that in mind would like to see the unit with slightly rounded edges.

    Stock I would get roughly 48mpg highway and twisting the throttle left you wondering if you would accelerate. Now the bike has power and with the SLM05 connected still economical.

    Internet research reveals most comments about products tend to be negative. Just wanted to say I am happy with this unit.

  91. 91 Paul G. - ACCEL Motorcycle Apr 29th, 2010 at 8:38 am

    Thanks for the positive and informative feedback. Your comments are well received here at ACCEL and we will take a look at the few issues you stated here. I will speak with our engineer about the wire length and the positioning of the SLM module on your ’08. Thanks I will post some info about this once a solution is determined.

    Have any pictures of this bike?

    Paul G.

  92. 92 benny d May 17th, 2010 at 10:26 am

    i would like to say i have a 2007 1200 sportster and put the slm on it and it runs so much better i get good gas mileage thanks accel

  93. 93 John May 20th, 2010 at 4:01 pm

    Hey Paul I am posting this per your recommendation.
    I installed the SLM 04 on my 07 Dyna and like the other poster my check engine light came on. When I checked the diagnotics it also was showing the P0122 code (open/low TPS). I did the same thing; connected back up my stock connections and the codes would disappear. So I exchanged the unit thinking it was faulty. I installed my 2nd one and noticed it was doinig the same thing. I have checked my connections and nothing is bent, I was very careful. I also have a different problem which I will get to in a second.
    So when I first start the bike, the check engine light comes on, then turns off after approximately 4 or 5 seconds. When I check the diagnostics it is the P0122 code. I can clear it out, but as soon as I start it again the check engine light will come on again, go off, and throw that code. When I ride the bike runs great. Best it has ever run. So the check engine thing wasn’t bothering me too much. The other day I was riding on the freeway and noticed when I exited and came to a stop light the bike idled at a higher rate than normal. I would estimate around 1500 to 2000 rpms (no tach). After about 15 – 20 seconds it went to a normal idle. I didn’t pay too much attention to it, but today I was doing some freeway riding and got stuck in some construction. I noticed that when I would pull in my clutch the bike would continue to idle high. This was an issue because I never was able to stop long enough for it to go to normal idle. When I exited the freeway and stopped at a light it continued to high idle for about 15 -20 seconds then went back to normal idle. It then ran fine in city traffic, when I would pull in the clutch it would go back to normal idle. The idle just seems to stick when prolonged riding, in city traffic I have no problems.
    Could someone give me some help on this problem?

  94. 94 John May 20th, 2010 at 7:10 pm

    Looks like there are 3 of us now showing the same code. ?????

  95. 95 Frank May 29th, 2010 at 5:50 pm

    I have a SLM on my Dyna as well and my bike runs great! You might have a ground issue?

    A bad TPS can cause drivability problems such as hesitation (high-low idle). The sensor’s resistance changes as the throttle moves, causing the return voltage signal to vary. No change or skips in the output would indicate a faulty TPS sensor.

    Hope this helps.

  96. 96 John May 31st, 2010 at 4:23 pm


    I have still been using the SLM. I went out and bought a new TPS just to eliminate that as the issue. My bike’s check engine light still comes on after starting for about 3 seconds then shuts off. A diagnostic check shows the P0122 code and when I clear it it comes back. BUT, the bike is running awesome!!! Tech support over at Accel has been top notch and they are looking into the TPS code thing. It doesn’t matter what happens I will continue to use this product. I was using another piggyback system and was constantly trying different maps and the bike never ran like it does now. My mileage averages in the mid to upper 40s and the performance is so much better than the other system, eventhough the other system ran richer.
    I opened it up to see how well it would run and it ran smooth all the way up to 110mph. I stopped accelerating due to wind, but I’m sure it would have went past 120mph with the amount of throttle I had left.

  97. 97 Gary Jun 2nd, 2010 at 8:21 pm

    I don’t have the money for new cams or high cost exhausts so I am stuck with screaming eagle air cleaner (ventilator) and kerker slip ons. Will the accel SLM do me any good?

  98. 98 Gary Jun 2nd, 2010 at 8:22 pm

    I forgot to add that I have a new 2010 FHLR road king

  99. 99 Posilokd Jun 8th, 2010 at 9:56 pm

    Has anyone put this SLM on a marrelli(sp?) injected Evo yet? Im looking for a programmer badly. And a SLM with a O2 seems like the best idea to get around this poor early HD injection system.

  100. 100 BENNY Jun 15th, 2010 at 10:13 am

    I love the slm had pc3 had flat spot with it and low milage heard about slm got it my bike came to life now i get great gas milage i have a 07 sportster low and now i injoy riding it thanks accel

  101. 101 poki Jun 21st, 2010 at 5:40 pm

    does anyone have an answer for the intermittent high idle at stop, with regards to an slm installation.
    06 dyna with slm 04. thanks

  102. 102 bigg Jun 21st, 2010 at 9:39 pm

    hello. i have a 98′ road king. and i’m having the trouble that you’ll are talking about. i was told to get my bike remapped. my co-worker told me about this product. im thinking of using it., but i noticed that i don’t have any o2 sensors on my pipes. “PLEASE HELP !!! “

  103. 103 poki Jun 22nd, 2010 at 12:55 pm

    john, did replacing the TPS solve your idle issue?

  104. 104 neil cooney Aug 19th, 2010 at 11:41 am

    i own the blue deuce that you took pictures of after installing your accel plug wires ( great product) thanks for your help my email is thanks again

  105. 105 Hogmaster Aug 21st, 2010 at 10:50 am

    Bigg, You’ll need to install an oxygen sensor bung in the rear exhaust pipe the can be purchased from any muffler shop for around $5.00. You have to weld it approximatelt 3 inches out of the cylinder heads exhaust port. make sure it is positioned so it will not hit the transmission top. Any welding shop can do the job for around $30.00.

  106. 106 Roger Holmes Aug 23rd, 2010 at 8:01 pm

    I purchased a slm05 a few months ago for my 09 ultra. I also installed a set of thundercones and a screamin eagle aircleaner. Fuel mileage went up by about 6 miles to the gallon in town and out of town. It runs strong and sounds great. I highly recommend this product. It was a complete plug and play also.

  107. 107 Mac Oct 27th, 2010 at 7:03 pm

    Is this thread still active?
    What is Accel’s solution to the PO122 and the high idle?

  108. 108 poki Oct 28th, 2010 at 5:21 am

    check jon’s may 21 post

  109. 109 Jason @ ACCEL Motorcycle Oct 28th, 2010 at 7:54 am

    First off I would like to apologize for not answering these sooner. This is an old thread that I didn’t realize was still active. I am the new motorcycle tech and product specialist here at ACCEL. I am happy to say that the SLM program continues to grow. We have recently updated our SLM application list to cover the 2010 Touring models as well as all of the 2011 applications.

    Tom, John, and anyone else experiencing the P0122 error code. This is not a typical condition and I would like to replace your units. Please return them to me @ 10601 Memphis Ave #12. Cleveland, OH 44144 attn Jason Ellison.

    Neil, it was nice meeting you at Sturgis this year!

    Bigg, the O2 sensor and bung are included in the kit.

    I appreciate all of the feedback, good and bad. If anyone needs more information you can contact me directly.

  110. 110 poki Nov 1st, 2010 at 2:48 am

    jason, r u for real? is the p0122 error code related to the high idle problem i’ve been getting after my install? thanks

  111. 111 Jason @ ACCEL Motorcycle Nov 1st, 2010 at 8:23 am

    I don’t believe that the high idle problem is caused by the SLM.

    Regardless, if your having error codes we will replace your unit.

  112. 112 Fats Jan 30th, 2011 at 12:29 am

    Not sure if this thread is still active, but if it is, does anyone have any feedback with the SLM on 2010 touring bikes? I’m trying to weed my way through jungle of piggy-backs for my 2010 FLTRX.

  113. 113 Hogmaster Apr 2nd, 2011 at 11:17 am

    I’m still here installing these units and camshafts for my customers in Chicago with great success. I wouldn’t use anything else.

  114. 114 Steve Apr 16th, 2011 at 2:24 pm

    I’ve experienced the p0122 code and high idle on stockand modified bikes and have been able to clear up the issues by using injector cleaners.

  115. 115 David May 18th, 2011 at 4:11 am

    The po122 code can be cleared by cleanig all of the sensor’s if a sensor is dirty or foweled it will send a bad reading then you get the po122 code

  116. 116 Charley Jun 11th, 2011 at 7:17 am

    I have a 2007 FLHRC with a stock 96 engine to which I recently added Rinehart True Duals, a Stage1 Breather, SE adjustable push rods, & Accel Cams & SLM04 as recommended by Hogmaster. I couldn’t ask for better performance, & there are no ill side effects from the modifications, other than my highway gas mileage has dropped to 36 mpg and I can’t seem to get any better than that. When I purchased the bike, the original owner told me he had a dealer do a remap of the ECM to a 103 cu. in. map. I thought maybe the 103 map was causing the SLM to overcompensate and send more fuel to the cylinders, causing the bad mileage, so I spoke to a dealer about remapping the module to a Stage 2 map for the 96 cu in engine to see if that would help. The dealer said that without knowing the valve timing of the new cams that would not be possible. He said they could DYNO it and get back to optimum performance, but that is $800. When I bought the cams, they came with no specs as to lift, duration, valve timing etc, etc. Does anyone know what this is for the 96 in SLM cams? I am tempted to just unhook the SLM & see what the mpg does without it in the equation, but am concerned that with the free breathing of the engine, that it might run lean and cause the new exhaust to turn blue or damage the engine. Should this be a concern? Any good advice would be appreciated.

  117. 117 darryle holt Dec 16th, 2011 at 9:08 pm

    is there any way i can contact “hogmaster” a mechanic which comments on this site,as i would like to know what cams he is talking about with 34 degree closing on the intake and 535 lift . my email is

    thxs darryle

  118. 118 Bodean Dec 19th, 2011 at 5:23 pm

    I read on the install instructions that if cam has more than a 520 lift, would need to run another controler to get ECM adjusted then add SLM. I’m doing a 97 inch big bore with Screamin Eagle Stage II heads and will go with the Woods TW-5G cams which have a 575 lift. Right now my 01 Ultra with the MM injection is running the stock 88 inch jugs and heads with the S&S 510G cams and a FI2000R Auto Tune module. Wondering if the SLM will work with this upgrade, should i run the Cobra Auto Tune for a week or so and then switch to the SLM, or stay with the Cobra. Went to Sturgis this year and bike ran bad at higher elevations so hoping this SLM with it’s O2 bung can adjust my fuel for the higher altitude and help me get better than 29 mpg while in the mountains. If HogMaster could help me figure this out, I would be very greatful. Living in Southern Illinois i don’t have to worry about elevation variable to much and that’s why the Cobra FI2000R Auto Tune.

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