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Old 06-06-2005, 02:59 PM   #1
deluxsti
Scooby Specialist
 
Member#: 84313
Join Date: Apr 2005
Chapter/Region: NWIC
Location: Boise, ID
Vehicle:
04 Aspen STi

Default a/f learning and maf scaling

i just installed my perrin fmic and perrin big maf system.

and i got the a/f correction down to .78 at idle, but when im driving it climbs to 14.84 (i assume that is maxed out) then falls to around 7 or so when i go wot in the higher rpm's which is once it is out of closed loop. does this mean that i need to adjust the maf calibration more?? i have read that a af correction will bounce around alot when the maf is too low, but how do you know when you have gone too far in increasing the maf scaling?

i am using cobb street tuner
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Old 06-06-2005, 03:46 PM   #2
darksands
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Member#: 75122
Join Date: Nov 2004
Chapter/Region: SCIC
Location: Im in a glass case of emotion
Vehicle:
2005 Impreza WRX
Crystal Gray

Default

AF correction will bounce around when you accelerating and decelerating. Try to keep it at a constant load and a constant RPM when tuning the MAF. If your going uphill and then downhill, readings will be off.
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Old 06-06-2005, 04:22 PM   #3
x99percent
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Member#: 27108
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: Detroit-ish, MI
Vehicle:
2004 STi
2004 A4

Default

I have no experience with the ST software, but here's my guess, based on BigMAF experience with the UTEC:

Use the scaling to get things close (small A/F corrections) while at a cruise, and then make adjustments to the fuel map to make things proper at idle.
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