Thread: a little afc 2.2 tuning help?

just started doing a little bit of tuning on my car today. heres the mod list:

ported outled m90
ported lim to match
modded 1.9s
s&s headers
3.4 pulley
(and a jp double roller, but that doesnt matter)

im starting to get down my cruise fueling as its usually within 2 or 3 of zero, but going WOT im knocking up to 5* on the top of 2nd. my o2s are around 940 which i believe is slightly on the rich side, but not a bad thing for a street tune. the ltfts lock in around -12 when going WOT, but this doesnt happen until around 9k Hz on the maf.

any suggestions on how to get rid of my knock? -12 ltfts are pulling fuel, correct? so shouldnt i be running rich and getting rid of the knock already? im pretty sure with my mods that i should be able to run a 3.4 no problem, so whats up here.

i have no tuning experience and not very reliable access to a tuner. i cannot seem to get my ls1m to import scans on my laptop either, so im SOL there. i also dont plan on taking my car to the track and i just want to run kr free through the top of second because if im maxing out 3rd im going too fast for the street anyway.

Originally Posted by Bio248

just started doing a little bit of tuning on my car today. heres the mod list:

ported outled m90
ported lim to match
modded 1.9s
s&s headers
3.4 pulley
(and a jp double roller, but that doesnt matter)

im starting to get down my cruise fueling as its usually within 2 or 3 of zero, but going WOT im knocking up to 5* on the top of 2nd. my o2s are around 940 which i believe is slightly on the rich side, but not a bad thing for a street tune. the ltfts lock in around -12 when going WOT, but this doesnt happen until around 9k Hz on the maf.

any suggestions on how to get rid of my knock? -12 ltfts are pulling fuel, correct? so shouldnt i be running rich and getting rid of the knock already? im pretty sure with my mods that i should be able to run a 3.4 no problem, so whats up here.

i have no tuning experience and not very reliable access to a tuner. i cannot seem to get my ls1m to import scans on my laptop either, so im SOL there. i also dont plan on taking my car to the track and i just want to run kr free through the top of second because if im maxing out 3rd im going too fast for the street anyway.

I had those mods and them some. My O2's were around 960. LTFT were within 2. I still got like .7* of knock occasionally. The 3.5 was a better choice on my car when it was rockered.

well that sucks..i already have a 3.2 on the side that i wanted to use. hah.

Maybe you'll get lucky, since every car is different. Even with the XP, full intake, exhaust and the usual stuff, I can only run a 3.25 with a good AFR.