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Old 11-07-2002, 08:14 AM   #1
is2scooby
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Default Definitive Post on ECU re-building Fuel/Ignition Maps

Aloha,

I've been poring over pages and pages of posts that were returned to me when using the term "ecu reset" and haven't been able to find an answer to this question:

Is there a definitive amount of time that needs to pass, or # of restarts, or miles that need to be traveled to have the ECU re-build an acceptable (read: no pulled timing!) fuel/ignition map after it has been "slept"?

I've read posts that say it takes hundreds of miles and weeks to re-learn acceptable limits, and some others that say 20 miles and 3-4 restarts at low boost and we're good to go.

Thoughts?

Mahalo,
Richard...

P.S. The practical application to the answer of this question will be very helpful to me as I plan on resetting my ECU to rid myself of any knock correcting "ignition advance pulls" my ECU may have learned in the past. I will then up the octane rating of the fuel I use (most likely with a good gallon or two splash of Toluene on a 1/4 tank of 92 premium) and see what kind of positive map my ECU can build for maximum performance in the 1/4 mile this Friday... The cooler weather and the promise of higher octane fuel have me hopeful in setting record times... *crosses fingers*

Mods: I apologize if this should be in the FFI forum - however I felt that the amount of datalogging that goes on with the members here in Engine Management & Tuning would be most helpful. If I'm in error please move the post to where it would fit best. TIA!
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Old 11-07-2002, 08:56 AM   #2
desiwrx02
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By unplugging the battery and draining its power, id imagine thats the best job you could do as far as clearing your ECU. Just hold down the brake after and your brake light will drain the power from the ECU. I believe Shiv was credited with that method.
Ajay
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Old 11-07-2002, 11:01 AM   #3
Jon [in CT]
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You obviously have no idea of what your timing advance knock correction is now and you have no idea of what your learned fuel trim is now. Monitor those two values and then report back how long it takes for them to stabilize at all load/rpm zones.
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Old 11-07-2002, 11:06 AM   #4
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i have never noticed the timing differnace .. then again i don't have delta dash .. thats about the only way to tell

on the other hand, fuel trim .. in my estimation takes at least 350-400 miles some times more
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Old 11-07-2002, 02:31 PM   #5
teiva-boy
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Well Richard, you only have a day before you head off to the track.... Better do it now and hope you travel to a lot of clients in the next day or so. See you tomorrow
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Old 11-07-2002, 05:04 PM   #6
is2scooby
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Quote:
Originally posted by Jon [in CT]
You obviously have no idea of what your timing advance knock correction is now and you have no idea of what your learned fuel trim is now. Monitor those two values and then report back how long it takes for them to stabilize at all load/rpm zones.
Thanks.

Last edited by is2scooby; 11-07-2002 at 05:19 PM.
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Old 11-07-2002, 05:05 PM   #7
is2scooby
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Quote:
Originally posted by Jaxx
i have never noticed the timing differnace .. then again i don't have delta dash .. thats about the only way to tell

on the other hand, fuel trim .. in my estimation takes at least 350-400 miles some times more
Thanks for your experience/input! That's what I was looking for!

Anybody else?

Mahalo,
Richard...
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Old 11-07-2002, 05:22 PM   #8
Jon [in CT]
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I've read (can't offer a citation) that the stock ECU's knock correction learning is fairly aggressive. I believe that knock correction learning IS the one learned parameter where you can "teach" the ECU that you've got "good" gas with repeated WOT runs. While it sees no knock, it advances timing (to a limit).
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Old 11-07-2002, 05:54 PM   #9
is2scooby
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Quote:
Originally posted by Jon [in CT]
I've read (can't offer a citation) that the stock ECU's knock correction learning is fairly aggressive. I believe that knock correction learning IS the one learned parameter where you can "teach" the ECU that you've got "good" gas with repeated WOT runs. While it sees no knock, it advances timing (to a limit).
Thanks for the helpful information!

I'm hoping to get a good knock correction factor by tomorrow night. I think I have my work cut out for me!
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