went 12.61 but o2 sensor was not working correctly . not sure if the leaded fuel i put in ( 5 gallons , i was gonna spray it ) or what happend . maybe once i get it working again it will knock a nother tenth or two off .

basic combo 383 , vortec 906 heads stock valves , small cam , converted dual plane intake with elbow , stock gears , 10" converter

 

Nice times already way to go. What does your intake look like?

 

Not bad at all, i have a very similar setup to yours, info. is in my sig. I'm also curious about the intake.

 

i think the car will run 12.40's with the factory 3:23 gears and might run 12.20's with more gear. with more cam it would run 11's i am sure. once i get the o2 sensor problem fixed and confident in the tune i will consentrate more on my n2o tune and try and put the car in the 10's.

 

107 will go 12.4 or better once optimized. you may pick up more mph once you get some more gear in too. may even run better on 93 octane pump gas...

what size tire?

all these good running vortec headed motors makes me want to build one and put it in an s10 or something, lol!

 

Is anything done to the heads at all? Thats the comp 276hr14 cam correct? I went a 11.95 with some 1.6 rockers on that cam in a 350, although it did have better heads. If you get the tune straightened out/o2 issue fixed it may pick up a bit.

 

the cam is similar to that . i'll have to get my cam card but if i remember it is .500 on both lift , 220 @.050 intake 230 @ .050 exhaust , 114 ls , 110 ilc. On the heads i blended the bowl , knocked a little casting flash off a couple of areas , had the valve guides shortened and new springs/retainers/locks.

i wish it would have had the o2 sensor working correctly. normally i see high 790-low 860 mv and 80's% injector duty cycle (i run 30lb injectors). on this run i had an o2 sensor reading of 42 and injector duty cycle of mid 60's%.

the car left good but was laboring going downtrack.

 

Im sure the leaded fuel killed your o2. It doesnt take long at all. What fuel pressure do you run? I used 30s and was nowhere near that duty cycle even at only 35 psi. I always had pretty good luck tuning with the factory o2 at wot. Keep it around .850-.890 mv.

 

i run 40lb fuel pressure. i am commanding wot afr of 12.5>12.8 .
i was a little off on o2 mv range it does go upper 800's. i need to play more with timing more , on this screenshot i had it up too high just experimenting.

 

 

Looking real good Tater.

 

that car is super clean! gotta love a 91-92 formula!

 

thanxs guys . it looks alot better at night . but it is a pretty nice car.
if the rain stops i am going back out tonight , might even spray it a little