P.S.I.cho

ok, i just got the car off the dyno about a week ago 574 hp 490 ft lbs, at idle its rich from 1-5k rpm its perfects from 5k-6.5k it drops way lean off the chart, heres what i got:
331 stroker, 9.3:1 compression, 65mm maf, 75mm TB, trick flow trackheat R intake, d-1sc procharger @10lbs.
ive been told a few different things and i have mixed opinions im just trying to gather ideas on what to check next, my fuel pressure is a constant 49 psi never drops, diablo sport tuners are saying the tune is good and to check for a larger MAF, i was told by another guy that maybe the 02 sensors are too far or too close to the motor with the L/T headers. but i think the 02 should be in correct spot so for now im gonna try to stay away from that one, what about a 90mm MAF or is that not going to help anything? any other ideas? and if 90mm would be better who makes one for a 1995 GT im having troubles finding one.

since people didnt read my other post...ill add 42 lbs injectors, 255 in tank pump

93 LX FiveO

ur maf is waaaay small

what kinda fuel pump u got and what injectors?

P.S.I.cho

42 lb inj and 255 lph in tank pump

capri_83

What size injecters???? need more info....

2 kwik

I use a hand built 105mm on mine.... what a bitch it was to get the sample correct.....I have a kenny bell maf if you want it..cheap

Joel5.0

Bad tune......although the MAF is now a restriction.

P.S.I.cho

ya 65 mm = about 2.6 inches and i belive the rest of the piping is 2.5 or 3 inches

2 kwik

seems to me you are pegging your maf....you need more control so invest in a Tweecer RT,PMS or the like

P.S.I.cho

ya i found something else kinda intresting ill post a link what do u think about this im gonna call them tomorrow and maybe call procharger to get their opinion too, if i get this new MAF it should correct it, can be tuned for 42 lb injectors, and the procharger. this maf makes sense to me because the outlet blows through the MAF on a procharger system charging the MAF, on a vortech or powerdyne the MAF is on the inlet side so this would be require check this MAF setup out let me know your thoughts http://www.jdsperformance.com/index....m&inmake=0

samseed101

+1 on pegging the meter. That would be my guess for leaning out at the top. As far as being rich at idle, all you have to do for that is lean out the lower portion of the MAF transfer.

That MAF that you are looking at is exactly what I have. I switched to teh 3" Protube blow through MAF and it's awesome! Easy to tune and great accuracy.