| Author | Message | ||
     Raven41 |
Hi all, just a quick question on an issue that has been bugging me for some time now. Have my 07 ULy about 2 years now and all was fine and dandy until it started to suffer with the dreaded exhaust rot. So one stainless can later (stealth exhaust - uk based which I believe is similar to a drummer) improves the look of the bike but not the throttle response. As you can imagine without fiddling with the fuelling it ran poorly at lower rpms. So after some research have installed an ebr ecm (for a stainless drummer) and k&n filter.Also got a tps reset done at my local HD dealership. This improves things a LOT but there is still a tiny bit of hesitation around the 2500 - 3500 range, as if its running slightly lean. When ripping up through the gears, no problem at all. My understanding is, as its a race ecm I cannot perform a tps reset myself or alter the fuelling in any way. Also find the tickover is more erratic as it constanly jumps around the 1000 - 1200 range. Are all these symptons part of the race ecm's character and one learns to live with them or is there a way to further fine tune things... | ||
| Djohnk |
For the 1000-1200 range jumping it sounds like you just have to mess with the idle adjustment a little. My '07 is very sensitive to idle and will do that jumping if not in the right spot. Carry around one of those hex-head screwdrivers with you for a couple rides and adjust the idle (behind the air scoop). Some people have the mis-conception that the TPS calibration and idle adjustment are in some way the same thing, but they are in fact separate issues. Once you find where it likes, make note of it. Mine likes it a little lower than spec. Note: I believe after '07 Ulys you no longer have that manual idle adjustment. Buell came up with some other electronic solution. | ||
| Teeps |
'08 and later XBs have an IAC (idle air control) valve. It's a measured air leak for the purpose of maintaining a "proper" engine idle speed. | ||
| Uly_man |
Raven41. It sounds like you have looked into this very well and done all the right things. The Stealth can is a great bit of kit and I use one on my 10 bike. And yes the fueling needs doing on a 06 bike with ANY can including a Remus. Next bit. The fueling will not be perfect with this can using the EBR ECM as was NOT mapped for it. The "tiny bit of hesitation around the 2500 - 3500 range, as if its running slightly lean" may be correct for that reason. Depending on how bad you find it you can either "drive" through that RPM point or fix it. Next bit. If it was me I would get TunerPro, re-fit your OEM ECM and save the map. Then re install your EBR ECM and copy each page using screen shot and then printing them out. Re install your OEM ECM and then use the EBR ECM numbers and see what happens. You can not damage the OEM ECM doing this as if it does not work right then you can flash the old prog back to it. If it then works like the EBR ECM you can then start to tune out any problems IE Add a few points in the map to add fuel as needed. I always found that the fluctuating idle on my 06 bike was caused by a bad TPS reset and MUST be done on changing the ECMs. It is critical on the 06 bikes IMO. | ||
| Teeps |
Uly_man, I agree with your last sentence. Which begs the question: Do you do TPS reset with engine cold or at operating temperature? | ||
| General_ulysses |
My 06 Uly had occasional low rpm stumbles and pops. Resetting the TPS did not fix it. Resetting the AFV value seemed to correct the problem. My bike is all stock though, other than a K&N filter. Sounds like you have more mods, adding to the complexity a bit. Still, give he AFV reset a shot and see what happens. | ||
| Djohnk |
If they did the TPS sensor and idle adjustment cold at the Harley Dealership (like they often do), your idle is off a little IMHO. It's easy fix on the '07. Play around with the idle after your rode it for awhile, find where the bike likes it (mine likes idling around 1000 RPM and if it's a little high it starts creeping up at stoplights when the engine is hot). Adjusting the idle won't fix your other problem though. | ||
| Raven41 |
Thanks guys for you input, some good suggestions there. Djohnk, I will have a go at adjusting the idle myself when I next have the bike out. I was under the misconception that this would alter the tps but a relief to hear it can be done. Ulyman, tbh I dont think I would have the necessary computer skills to do as you suggested with Tunerpro and i would be afraid I could mess up either one or both ecm's I think, as you state, it was done with the engine cold whereas back with standard ecm I did my own reset when engine was up to operating temp. My local HD dealer didnt fill me with confidence on his knowledge of/interest in Buells and may head elsewhere for future work. Tbh had no real desire to start this tinkering with the bike and was happy enough with the performance/sound of the stock machine. Just that damn rusting can would d drive me nuts on what was an otherwise spotless bike. Have often though of getting it ceramic coated and bringing it back to stock. Having said that Uly man I agree with you, the stealth can is a serious piece of kit and great value compared to remus. Am very happy with the fit and finish on it. | ||
| Froggy |
The way the TPS reset works is you back out the idle screw till it is completely closed, then you press the button to tell the computer "this is position zero", so it knows how open or closed the throttle is relative to that point. From there, idle on a bike that doesn't have any issues should be around 1050RPM at 5.4% throttle, and you can tweak it a bit without hurting anything but if it is too low it can be difficult to start, and too high will cause the engine to hang at around 2000rpm when coasting. | ||
| Uly_man |
The reason that the TPS needs to be re-set on the pre IAC bikes is because, for one thing, it "drifts a little" over time. Possibly due to movement of the idle adjuster cable. The AFV (Adaptive Fuel Value) adjusts the fueling and adds or removes fuel over the fuel map due to riding conditions. The upper and lower ECM prog numbers for this are about 80 to 120. Zero is 100 would be normal and above or below is due to conditions. If it was to stay at the higher or lower limits ALL the time then you would need to look into the situation further. Otherwise do not worry on the AFV. The TPS on the 06 bikes MUST BE DONE CORRECTLY or you will get that idle creep and/ or the idle jumps up and then takes a time to go back to about 1000 rpm. It is tricky to get right and may need a couple of tries to get a good result. Or at least that is what I found on my 06 bike. |
