fasterthanyou
Registered User
motor: 93 SC, ported big valve heads, mild .550 lift cam, ported late model with MP plenum, PP 75mm tb, stock intercooler/piping, stock exhaust manifolds, 60lb injectors, 4r70w trans, stock FPR.
issue: runs rich at all times.
**injector slopes are set at about 57.xx for the high slope and 64.xx for the low slope with .000014 injector breakpoint. (only huge changes in these slopes seem to affect my AFR) if i leave it at the stock injector settings it runs rich at around 11.4AFR at idle. the slopes i listed have the car idling at 13.4AFR at idle and very very rich while cruising and wot. anything above 70 for the high and low slopes dont do ANYTHING towards the AFR.
**Injector offset vs voltage. I cut the stock values in half, this seemed to help a little...but sometimes it wouldn't help at all. it would run stoich for about 2 seconds after cutting the injector offsets in half but then would go rich again. I set the offsets to .10 for anything above 12 volts and it still ran rich. about 13.5 at idle.
I'm running the stock maf, the only way I can get the AFR near perfect is by subtracting 15% to the entire curve. If its at all possible, I'd like to keep the maf curve stock since its a big factor in accurate load calculations(correct?). My short term fuel trims are way off base. when I go WOT they are at 20%, somtimes 18% but pretty much stuck at 20%
can anyone offer any advice?
issue: runs rich at all times.
**injector slopes are set at about 57.xx for the high slope and 64.xx for the low slope with .000014 injector breakpoint. (only huge changes in these slopes seem to affect my AFR) if i leave it at the stock injector settings it runs rich at around 11.4AFR at idle. the slopes i listed have the car idling at 13.4AFR at idle and very very rich while cruising and wot. anything above 70 for the high and low slopes dont do ANYTHING towards the AFR.
**Injector offset vs voltage. I cut the stock values in half, this seemed to help a little...but sometimes it wouldn't help at all. it would run stoich for about 2 seconds after cutting the injector offsets in half but then would go rich again. I set the offsets to .10 for anything above 12 volts and it still ran rich. about 13.5 at idle.
I'm running the stock maf, the only way I can get the AFR near perfect is by subtracting 15% to the entire curve. If its at all possible, I'd like to keep the maf curve stock since its a big factor in accurate load calculations(correct?). My short term fuel trims are way off base. when I go WOT they are at 20%, somtimes 18% but pretty much stuck at 20%
can anyone offer any advice?