What's your opinion on reseting the ECU?
 

[url]https://www.i-club.com/forums/showthread.php?s=&threadid=12978[/url]
check out this thread and let me know whether or not you think its a good idea...
i think it should help free up some power if you drive your car like you stole it after the reset...what about you guys?

As everyone else is also going to tell you, the entire purpose of the ECU is to "train" the engine to avoid detonation. As running rich is less dangerous than running lean, it is obvious that after an ECU reset, your car will run rich. Running rich does make more power (and eat more gas). However, the ECU is a learning system -- it WILL eventually train itself back to the previous level. In the meantime, you have thrown away months and months of valuable data that was preventing detonation in your motor, only to end up back at the same place you were in the beginning.

Pointless "mod" not even worthy of being called as such. The ECU is an extremely sophisticated and well-engineered device; defeating its purpose by manually resetting it (even disregarding the fact that it WILL retrain itself eventually) is just silly. If you can't stand having a computer run your air/fuel mixture, install an APEX and blow your engine block through your hood on your own dime.

I wouldn't do it IMO.

I think a reflash for better mapping is good. It seems as though your trying to fool the ecu for a while, by just reseting it. Technically you are back to 0 miles and you have to break in your ecu again. I think that the reason for the 1000 mile under 4000 rpm is not only for the engine internals but for the ecu as well

Well what would you say to someone who hasn't redlined much or driven too hard and is about to reset the ECU and drive it like s/he stole it? If he was always on good gas and was thinking about using Vishnu's quick ECU learning trick, I'd say it might be a good idea to go ahead and reset it.

Does anyone else buy that guys idea of removing the intake silencer to gain 10-15hp?

[QUOTE][i]Originally posted by meilers [/i]
[B]As running rich is less dangerous than running lean, it is obvious that after an ECU reset, your car will run rich. Running rich does make more power (and eat more gas)[/B][/QUOTE]

running rich makes you lose power actually..

^yeah

If you have been driving your car like "a grandma" then resetting your ecu will reset everything it has learned from you previous driving habits and conform to your new one's.

The ECU in the WRX reacts quickly to changes so instead of reesetting the ecu I would just start driving more aggressive and after several runs the ecu will have adjusted. Doing this keeps the values that the ecu has learned for knock protection. But allows the ECU to play with the timing values.

My impressions on how the ECU reacts to knock is by developing a value through trial and error. If you reset the ECU the computer will have to redevelop this value and by doing so some knock/detonation will happen during the learning process. Come to think of it the only time I would reset the ECU is after a tank of crappy gas or when adding a new mod.

ECU's have come a long way from early model ECU/PCMs. I remember in my mom's minivan that it would take two weeks for the ecu to learn that I was driving it. After my girlfriend has been driving my car for a few days I get in it and I can't tell that she has been driving it because the ECU can adjust so quickly.

just my .02

-skooter