Hello,
I am a proud owner of a 91 firebird (100,000miles)with the 305 tbi (auto). I added hedman headers and dynomax exhaust, k&n Filter, performance automotive superchip, 3:42 open diif, Hypertech igniton module. I was wondering want my 1/4 mile time might be since I don't have a track near my house. Thank you in advance!!!

 

Hey welcome aboard!

The gears and exhaust have really waken your car up and you should be anwhere from high 14's to low 15's. There are many factors which prevent a totaly accurate geuss. I would put the stock chip back in and ditch the superchip. Off the shelf chips are a stab in the dark when it comes to what each individual car needs. Chances are you are running slower with it than with the stocker.

 

I would say mid to high 15's judging from my step by step bolt ons. Stock your car like mine probably runs low 16's so with proper traction, I think .5 would be a close guess.

 

well my best time was 14.79 @ 91.xx MPH with the mods in my sig minus the probuild tranny, 2400 stall, and Edelbrock TBI intake, just to give you and idea of what is possible with very good traction.