Thread: right combo?

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Originally Posted by glennsexton

Your S10 probably weighs in between 3200 and 3500 pounds. A six second (I’m assuming 1/8 time) time is in the 9.5 seconds to high 10 second ¼ mile time. 3200 pound car would need about 535 horsepower at the wheels and a 3500 pound car will need real close to 600 horse.

There are 2 ways to talk about horsepower, at the flywheel, which is the normal way of talking about horsepower, and then there is horsepower at the wheels, which is a whole different story and the one that's used in online formulas for figuring E.T. and speed at the dragstrip. At the wheels takes into consideration all the losses through the torque converter, transmission, driveshaft, u-joints and differential, axles, wheels and tires. You can normally figure on a loss of about 20%, so for instance 600 hp at the flywheel would equal 480 hp at the rear wheels. If you need 600 hp at the wheels, then you need 750 hp at the flywheel and you have surpassed the strength of a production Chevy 350 block. You'd be driving over the crankshaft before you got to the end of the track due to pulling the lower end webbing out of the block.
http://dndracing.com/blog/blog/blogp...nk%20Motor.jpg

Originally Posted by glennsexton

When you’re talking these kind of times, all sponsored tracks will mandate adherence to IHRA rules and it can get real expensive real quick. You’ll need to get a copy of Safety Foundation Incorporated (SFI) requirements as everything from your harmonic balancer (SFI 18:1) to your driver restraint system (SFI 16:1) needs to comply.

What you need is an NHRA Rulebook, it has all the SFI requirements in the back of the book. And by the way, SFI stands for SEMA Foundation, Inc...... SEMA stands for Specialty Equipment Marketing Association. Summit has 'em for sale.....
http://www.summitracing.com/parts/sum-nhrarb/overview/

A lighter car, such as a 2500 lb car, with 580 hp at the flywheel, will turn the 1/8 mile at 6.00 E.T. (visualize a VW bug, full of lightening holes and with a 383 mounted up front). You could build such a motor for about $5000-$6000. Then figure $650 for the torque converter, $1500 for the transmission and $2000 for the rear suspension, diff, gears, axles and locker. A good cage would be at least $1500. Here's where it gets expensive.....6.00 in the 1/8 mile equates to 9.60 in the 1/4 mile. Get your rulebook and look at all the equipment you will need to go 9.60.

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