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i had this posted in the general section but id like to see what you say hutch:

i have a 355 procharged combo putting out 625 [email protected] rpm and 515 ft lbs torque at 5300 rpms. My qtr mile time was a [email protected] I dont understand how it is this high? I wouldve thought at least my mph wouldve been higher because of the hp. The car weighs approx 3400 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 trans is a th400 and the convertor is approx a 4000 stall.

the slip is as follows:

60' 1.744
330 4.773
1/8 7.202 @101.19
1000 9.311
1/4 [email protected]
 

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The lower the slip percentage, the better. Anything under 10% is good. My converter slip is around 4%.

Your slip based on
28" tall tires
3.89 gear
127.43 mph
6650 rpm at finish line

calculates out to 10.55% converter slip. 4.10 gears would probably be a better choice.
 

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are the tires 28" tall radials or 28"tall slicks? if they're slicks , then wouldnt you have to factor in for growth? a slick will gain several inches of rollout at speed.
 

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You've got 10.4% slip, which ain't that bad.. I had a converter that slipped 10.8% , and it was a monster all the way thru..

When you're slipping, you are multiplying torque.. Up to a point !!
 
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