| Author | Message | ||
     Goatsac |
I recently got an S3 and am having running issues. Specifically it is surging/jerking at constant power settings, felt more in the low range. After much reading I think the maps need to be changed. I am not sure what was done to the ECM prior to my getting the bike but I know it has a Supertrapp muffler and a forcewinder intake. Anybody able to help? | ||
| Akbuell |
Sounds like a classic symptom of a lean mixture. The intake and exhaust changes may contribute to that. Might do to check and make sure the intake seals are not leaking first. If they have been in for 2-3 years or more, they are probably due to be changed anyway. Then if the symptoms continue, think about maps changes. Hope this helps, Dave | ||
| Goatsac |
Akbuell, I will check this out and see if changing the seals helps. At the least, it can't hurt. Thanks. | ||
| Impala |
I can email you a map if needed too. | ||
| Kalali |
You'll need the ECMSpy software and the cable to load the maps. | ||
| Goatsac |
I have the cable and software, but no maps to load. Impala - I would appreciate it! goatsac@gmail.com | ||
| Hootowl |
When you say "low RPM", what do you mean? The cams in the S3 are such that the engine really isn't happy below 3K, and common wisdom is that you should never ride around below that. If you still have the the stock map, by all means replace it, but be aware that it may not solve all the low RPM issues. | ||
| Mnscrounger |
Before you remap, check for fault codes in the ECM. Also try replacing the engine temperature sensor if you haven't already. It's a common part to fail. I've done two on my S3 in 4 years. When they fail, I get symptoms very similar to what you describe. The S3 one is listed by the Buell dealers as a "kit" for the S3 for around 85 bucks. (part #32564-99YC, super ceded to part#P1278.k) It's also available at American Sport Bike. I also confirmed with the manuals that the XB sensor is the same part for both bikes in fitment and R/T curve, but with a slightly different connector (part #Y0605.K)that one may be cheaper and easier to get, and its the one I'm currently running in mine. Good luck | ||
| Serialk |
Don't know what map you have Impala but I remember I kept a screen shot of my X1 Race Map before I started to explore ECMspy   If yours looks like this and still runs like crap then I would start going through a checklist. Dont throw parts at it. ecm spy will tell you if the engine temp sensor is faulty. fire the bike up and spray WD40 or brake clean to test for a intake leak. Test to see if the piece failed first before replacing it. surging can be caused by a number of things. Without seeing it or riding it, diagnosing a running issue online is a shot in the dark... I would do the following diagnosis checklist on a surging problem and test and fix/replace the problem Battery connections tight. grounds tight Correct base ECM map Engine temp is responding on ecm spy while running Intake seals Exhaust seals Check fuel pressure. A failing regulator or pump can cause a surge A bad 02 sensor could cause low rpm stumble/surge Its just a process of elimination. It may not be anything I just listed but its a start. start with the basics and take it from there. Don't waste your time throwing parts at it. Take the time diagnosing it and replace the part that you know is faulty. (Message edited by serialk on December 07, 2013) | ||
| Firemanjim |
Serial, I hope you modified that rear map!! Look at how much fuel that has at 1200 rpm!!!! Front way more normal!. And am betting that S-3 has some real wonky map in it as I have had about 4-5 tubers lately with some really odd mapping around 3-4000 rpm, a bad lean spot. | ||
| Kalali |
Fireman, are you saying there is too much fuel or not enough? As you know each exhaust/intake combination requires a different map. I looked at mine and my maps are about 5 points richer almost across the board with an SS2R and Forcewinder. And it pulls like a freight train from idle to red line. My bike lives at sea level. | ||
| Firemanjim |
When you look at a fuel map it should show a logical and for the most part, smooth progression up the throttle position/RPM range. If you look at the rear map posted it has more fuel at 1200 rpm (really---who is at 100% throttle at 1200 rpm and why would you need so much fuel???) than it does at 2500----and even those are high compared to front cylinder map. The max fuel available in this system is 255 bits, and on bikes I tune this is rarely necessary, but look at the rear cylinder at 5000 RPM---254, nearly maxed out. | ||
| Kalali |
Thanks. Your point is well taken. I guess I really don't pay too much attention to areas which are outside of any realistic riding conditions. My focus is generally on the area around and including the closed loop to make sure the transition is smooth and linear. I suppose some of those outlier points could be touched if the throttle is snapped open at lower RPM areas. Good input. | ||
| Mnscrounger |
I gotta get me a copy of ECM spy one of these days. I've gotten to know the bike well enough I think I'm ready to at least hook it up to see what's going on, but I'm probably not brave enough to make any changes....yet. | ||
| Kalali |
I think ECMSpy is a must for anyone who owns an older model Buell, especially an FI tuber. It makes you feel you're connected directly to the heart of the beast... |
