what does the ecu learn after you reset it?

[pillzor]

as title says, i understand the ecu relearns certain things after you reset it and i was just curious too see what they all are.
is it just fuel / air mixtures ?

 

[speed_freak]

it can also learn shift times slightly. driving the car really hard after resetting tunes the shift to change a lil later in the rev range and vice versa

 

[Vee-ard]

it can also learn shift times slightly. driving the car really hard after resetting tunes the shift to change a lil later in the rev range and vice versa

No, it doesnt... What people always fail to understand is that the ECU is constantly updating itself. If this were true, It would do this without needing to be reset first. What you're talking about is probably all placebo effect.

The only way the shift points would really change, is if you had a tune like I do, a greenfoam one, where he sets the shift points in the memcal to be firmer, more aggressive and hold gear longer.

 

[Cursed CX8]

iv been told there are small gains to be had, last time i re-set the ecu i ****ed my shift points and the shifts went back to being weak and sluggish like before i had it tuned.

After a week they went back to normal.
Thats pretty much my only input

 

[VSPantha]

I've always been told that after you do the reset, start the car and hold it at 3000rpm for the first 8 seconds so it can do the air/fuel mixture calculation. Not sure about the shift points... I thought that they were coded into the memcal and couldn't be altered by resetting?
This might be a question for Greenfoam to answer

 

[hako]

You don't need to reset the ECU or have a tune to alter shift points - just press the power button and that delays the shifts same as a tune.

 

[-Guy-]

You don't need to reset the ECU or have a tune to alter shift points - just press the power button and that delays the shifts same as a tune.

The power button doesnt have the same effect as a tune. If so, why would people be wasting money on getting their car tuned? When you get a tune it makes the car have a bit more grunt and also delays the shifts..The power button only delays the shifts and gives a little bit more power. Does not do the same thing as a tune though.

 

[pillzor]

well case in point, after putting delcos memcal in my vs goes harder in economy than it did in power when it was stock.

 

[aceventura]

The power button doesnt have the same effect as a tune. If so, why would people be wasting money on getting their car tuned? When you get a tune it makes the car have a bit more grunt and also delays the shifts..The power button only delays the shifts and gives a little bit more power. Does not do the same thing as a tune though.

If you read Hako's post correctly he is saying that if all you want to do is change the shift points then press the power button, not change your tune. A tuned memcal changes many other parameters as well as the shift points.

In any case, I agree with Vee-ard - I would doubt that shift points are learnt.

I've always been told that after you do the reset, start the car and hold it at 3000rpm for the first 8 seconds so it can do the air/fuel mixture calculation.

This may be correct, but I have watched the engine parameters on startup, and it takes ~1 min for the car to enter closed loop mode, and it would need to do this to change any air/fuel mixtures in a sensible way.

Again, like Vee-ard said, the ecu is constantly adapting, albeit slowly (as I think it averages old and new information in some way), so it will learn this as you drive. My feeling is that you should only need to reset if you change something in the engine that will change performance.

 

[delcowizzid]

it will learn fuel ratio's to get it perfect at cruise will learn IAC steps to keep good idle and will change shift pressures untill it changes gears at its preset shift times in the tune if its slipping into gears the ecu will change pressure untill it changes gears withen a set time and vice versa if its changing to fast but it can only adjust so far