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fuel trims and afc settings

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Cirus_93TSI

15+ Year Contributor
658
0
Jun 30, 2003
Glen Burnie, Maryland
i finally got a new knock sensor and can tune my car now, but im having a little trouble with the afc settings.
what i want to ask is, if my low fuel trim is somewhere between 60 and 139% does that mean my idle is ok?
because im running 550s and a 2g mas w/ lower honey combs removed, and a walbro 255 w/stock FPR(an afpr is next on my list, but i wolnt have it for a month or so), and to keep my low fuel from pegging at 139% i have to set the afc to between +27 and +29 at idle. and even then it stays at or above 130%.
should i set my fuel at idle higher to get the low trim down closer to 100, or do you think that is too much fuel? would resetting my ecu help, and if so should i keep my current settings of reset the acf to zero when i reset it?

and also, how can i tell where to set my TH points? i know they arent wuite right by how my car feels when cruising, they are at 30 and 70 now. im wondering how to tell or feel weather i need to lower.raise the low or lower/raise the high. everything iv found about it has been pretty vauge.
 
Get an AFPR and put your lower honeycombs back in. The lower honeycombs should richin it back up. You dont need to take the honeycombs outta the mass. Put them back innnnnnnnnnn
 
christ, why does everyone assume i have the honey combs, i dont. the car had the 2g mas without hony combs and afc when i bought it, if anything im going to buy a 1g mas and go with that, but i want the extra airflow.

so back my question, if anyone can actually answer instead of stating the obvious fact i need an afpr and their opinion about my honey combs.

is the low fuel trim being between 138 and 61% an indication my ecu is able to compensate enough to make my car idle ok? because it constantly pegs at 139% if a set my idle below +28(w/550s).
does anyone know what the stock injector pulse width is? because my car feels like it idles better if i can get the injector pulse at idle up from 2.31 ms to 2.5 something ms, but it doesnt like to stay there and always dropps back to 2.31 by the time i park my car for the night.

also, how do i tell weather my th points on the acf need to be lowered or raised, and which one needs to be adjusted. my midrange accel doesnt feel all that good, although playing with them iv gotten it good enough to be driveable, it was just trial and error. and it feels very slow if im below 4k rpm.
 
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