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Old 06-06-2002, 03:09 PM   #1
aleks_rs
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Member#: 19217
Join Date: May 2002
Location: San Francisco, CA
Vehicle:
2001 Impreza 2.5RS
Red

Question ECU reset after intake install?

I've had my RS for about a year, circa 25k miles. Finally got a Ganzflow, which is coming in the mail. The install instructions recomend reseting the ECU. However, my ECU has learned quiet a bit in the last year. For example, I raced my friends 300ZX recently (non-turbo), and while I didnt beat him, we were nose-to-nose. About 6 months ago, this same Z was leaving me in the dust (I've run my car over 100 on the freeway almost on a daily basis lately, so that must've done it). I have no engine upgrades done right now. SOO, should I reset my ECU and loose all the good things it's learned? Anyone have any experience with this?
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Old 06-06-2002, 03:49 PM   #2
Jademonkey
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Member#: 9213
Join Date: Aug 2001
Location: My grandma was 6' 6"
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2000 RS
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Bottom line...you don't have to reset your ECU. But it's recommended to take quicker advantage of your new intake. Your ECU will eventually learn, resetting it just speeds up the process.
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Old 06-07-2002, 12:50 PM   #3
gypsymoth
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01 Silver 2.5 RS
04 Silver WRX STi

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The ECU is pretty smart. Over time it will learn new tricks and give you more HP. There is no need to reset it. The ECU will continue to learn.

As for all the remarks about the ECU learns quicker if resetted . . . I'm not so sure . . . considering that it take 3000 miles or so for the ECU to become fully effective.

Is 3000 miles quicker? 3000 miles is a long way. Can an un-reset ECU learn the same tricks in 3000 miles? I would think so.

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Old 06-09-2002, 11:41 AM   #4
BugBomb
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99 OBS & SUXASS
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Default Re: ECU reset after intake install?

Quote:
Originally posted by aleks_rs
For example, I raced my friends 300ZX recently (non-turbo), and while I didnt beat him, we were nose-to-nose. About 6 months ago, this same Z was leaving me in the dust (I've run my car over 100 on the freeway almost on a daily basis lately, so that must've done it).
The ECU does not "learn" or adjust settings at WOT, which is what I assume you were using while racing. The open-loop fuel maps do not change, ever. The ECU simply picks a pre-set map based on sensor input. Go search the internet for "open loop" and I am sure you will find plenty of websites that state this. Whatever differences you noticed would have to come from somewhere else, like driver ability, gas, or any number of variables.

Maybe we should have a segment in the N/A FAQ about WOT and open loop.
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