i have a 355 procharged combo putting out 625 rwhp@6600 rpm and 515 ft lbs torque at 5300 rpms. My qtr mile time was a 11.00@129mph. I wouldve thought at least my mph wouldve been higher because of the hp. The car weighs approx 3500 with me in it. My rpms through the traps was 6650 rpm. I have a th400 with a 3.89 rear gear and 28" tall tires. The convertor is approx a 2800 stall. With the rpms/tire/gear it calculates to a 10% slippage roughly.
I dont have any experience launching the car what so ever as this is my first supercharged car so i know i lost a bunch of time as i only had a 1.744 60' time. Any suggestions would be greatly appreciated.
Well 129mph is enough power to go WAY faster then 11.00. Yes the 1.74 60' is real slow for that much power. The converter looks like it's absolutely killing it. It might be crossing the finish line a little under where you would normally want it, but it looks like it's down in the begining. If you pick up the bottom end, it might get the RPM up at the finish line enough to not need a gear swap...
You dont say how your launching it,is it foot brake I assume?
The stall of 2800 is too low in my opinion.
Boost is made at rpm your stall is to low for boost, right?
i was foot braking it and it stalls out about 2800. i have a transbrake but it doesnt stall much higher (3grand at best).
I called trans specialties and they recommended a 3500-3800 stall because a higher stall may be too much and i get too much slippage on the top end. I also recommended to go to 4.11 gears as well.
Sound to me like the gear change would help, your using a small tire and it would definitely see a difference in the 60ft.
But the higher stall and the trans brake would make a difference too.
Why not try a trans brake launch first before you make any changes and see if it makes a difference?
oh it def was spinning, my father estimated about 25-30 feet of spinning.
launch rpm was 2800 rpms foot braked looking at my data log, full throttle flashed to 3000.
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