Guesses to power and quarter-mile times on a S2 3800SC/4T65 combo with these simple mods:

VS Cam
3.4 Pulley
Sinister Tune


How much smaller (average, i know every car is different) of a pulley can you run than a 3.4 with that cam?

Maybe a very low 13 second or high 12 and not a lot smaller pulley with just the VS cam unless you are going with an intercooler or maybe a good in car tune and scan. Dan

What tires? I use 215/60-14" Mickey Thompson ET streets

I can throw some real world #'s at you.

I do 12.8x when ambient air temp is in the high 50's
I do 13.0x when ambient air temp is in the low 70's
I do 13.2x when ambient air temp is in the high 90's

My 60ft is always 1.8xx and traction in a non issue

My car:
Pump gas
Stock Cam
3.4 Pulley
ZZP tune

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1986 SE 3800SC/4t65eHD (12.871@104.96) I'll Sell it if you like
1985 GT 3800SC (swap in progress)

quote Originally posted by IROCTAFIERO: Guesses to power and quarter-mile times on a S2 3800SC/4T65 combo with these simple mods: VS Cam 3.4 Pulley Sinister Tune How much smaller (average, i know every car is different) of a pulley can you run than a 3.4 with that cam?

I have about the same setup as you until I changed to E85 this spring. 12.5 at 105 is about what you will run.

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84 NB, 3800SC, E-85, VS Cam, 3.0 Pulley, 4T65E-HD, HP Tuners, AEM Wideband, Regal GS Gauges, S-10 Brake Booster. 1/4 mile -12.05 at 111.7mph

I went 12.75 @ 107mph with that exact setup. I had a 60ft of 1.77 as well. If you can get a good launch in you will hit 12's all day. I had stock gears in the transmission too.

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