| Author | Message | ||
     Mattmcc00 |
Pardon my ignorance but what is a TPS reset? and why do so many people talk about having to do it? I am considering the race ECM, doesn't seem to be any down sides to the race ECM only benefits, so why not (stock 2008 xb12x with rider comfort kit). but I am worried about the TPS reset? A | ||
| Froggy |
TPS = Throttle Position Sensor. It is what lets the ECM know how much you have twisted the throttle. If the TPS is not correctly set, the bike will run like crap or not at all as the ECM will not provide the correct amount of gas. A TPS reset only takes a few seconds to perform on 2008+ models, and it is recommended by a reputable tuner to perform the TPS reset every time you go to start the bike. | ||
| Union_man |
http://www.technoresearch.com/Manuals/Buell-TPS_Re set(Direct-Link).pdf | ||
| Mattmcc00 |
OK, thx that explains how to do it. simple really, but why? | ||
| Mattmcc00 |
will it not wet the plugs? | ||
| Union_man |
Beat you Froggy!!! Feels good! | ||
| Froggy |
I don't see how it could, no fuel is going into the motor when you are doing a TPS reset.
What are you talking about? | ||
| Union_man |
Nothin  | ||
| Ratbuell |
The throttle position sensor is a "volume knob" hooked to the throttle plate. The TPS reset tells the computer when the volume is at 0. Without that base reference, the computer doesn't know where your throttle actually is while you're going down the road (i.e. how far you are from 0). It uses throttle position as one of the main factors for determining fuel delivery, spark advance, etc. when you're riding, so a correct base value is required. | ||
| Mattmcc00 |
quote: will it not wet the plugs? -------------------------------------------------- ------------------------------ I don't see how it could, no fuel is going into the motor when you are doing a TPS reset. Didn't know if it would be injecting fuel in into the cyclinders with the key set to on and with all of that throttle turning ... guess not. | ||
| Ratbuell |
No fuel is going through the injectors unless the crank sensor senses rotation (or you have a leaky injector). | ||
| Johnboy777 |
Hey Mattmcc00, Are you planning on running the race ECM w/ the stock exhaust? Just curious. . | ||
| Rwven |
Johnboy, I'm running the race ECM with the stock exhaust. Works great. | ||
| Mattmcc00 |
Seeing as I cannot see any downsides to doing so, I figure why not! | ||
| Mattmcc00 |
So just to crystalise this in my mind, with the key set to ON, you can turn the throttle as much as you want with no risk of drowning the engine? | ||
| Johnboy777 |
""Johnboy, I'm running the race ECM with the stock exhaust. Works great."" As I recall (might be wrong though) the Race ECM has NO provision for the muffler valve operation ('cause the race can has no valve) - which means that it, the stock muff valve, would stay closed - which is very restrictive. If that is indeed is the case, I would think that wiring the muff valve open would help performance, as the race ECM was specifically tuned to the race muff, which is a more open (free-flowing) system. . | ||
| Rwven |
Johnboy, The EBR race ECM (for 08-09 XBs) operates the muffler valve and has the comfort kit fan protocol. The old race ECM that Buell used to sell did not have the muffler valve signal, to the best of my recollection. A fellow BadWebber (Portero as I recall) got an e-mail from EBR stating that the new ECMs were "smart" enough to detect the muffler valve servo and would not send an error code if you didn't connect it. It'll work fine with stock or aftermarket mufflers according to EBR. (Message edited by rwven on April 01, 2010) | ||
| Johnboy777 |
Thanks, Rwven , good info. . | ||
| Ironhead1977 |
Rwven, I am considering running the race ecm with the stock muffler. Can you tell any difference in running conditions? Also was it plug n play? (Message edited by ironhead1977 on April 01, 2010) | ||
| Etennuly |
MattmccOO, you can whack the throttle all you want with the engine off and the key on. No fuel will be delivered through the injectors, being without a carburetor there is no pump or squirter nozzles. | ||
| Ratbuell |
Johnboy - I ran my '06 with a race ECM and a stock muffler wired open for a few days. It was a DOG. It pinged, carried on, and basically ran like poop. The ECM had been in the bike for 10,000 miles, with a Drummer, and running OK (I pulled the Drummer because the noise was getting to me on longer rides). Put the stock ECM back in, hooked the muffler valve back up, and ran it without an outer airbox for a bit. The valve hardly *ever* opens. It opened from, say, 95% to 100% throttle, and that was about it. And the bike flat out SCREAMS now. "Restrictive"? Don't think so. It's more than backpressure at work. There's a reason the tuber race headers had longer primary tubes - exhaust is as much about tuned length as it is about backpressure. Wired open, the stock muffler is too 'short' to keep the bike happy. I'm not sure what's inside a Drummer, but apparently it's pretty similar (not only backpressure-wise, but length-wise) to a Buell race muffler. A stock muffler wired open is NOT. | ||
| Johnboy777 |
Hey Rat, My bike must be an anomaly – it did just the opposite. It ran like crap with the valve closed and screamed with it wired open. However I did fatten up my fuel maps some. I should put it on a dyno (just $50 here) to see where it is AFR-wise. John | ||
| Ejc |
I thought only the '06 needed the TPS reset. | ||
| Froggy |
You thought wrong.  | ||
| Mattmcc00 |
ok thx for the info. The TPS reset is really easy for an 08 so I did it. | ||
| Standingdeadwood |
Is the TPS reset the same for the stock ECM as it is for the race ECM? | ||
| Ratbuell |
Yep, process is identical. Only the fuel/spark maps are different from OEM to Race ECMs; same software, different values. | ||
| Bdub_uly |
I did the TPS reset on my "new to me" '08 Uly before it had been started today. Cranked it and it ran better than it ever had.  Took it for a 15 mile run and only thing was it had a slight bog off idle. Went out an hour or so later, did the reset again, cranked it and it runs like crap again!  Is this due to the fact that it was still warm when I did the second reset? Thanks bdub Central Texas |
