Thread: right combo?

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Hmmm I’m not sure exactly where this is going;

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.

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.

To go that fast, you need a design that incorporates a lot of engineered parts, not least of which is your chassis and an S10 would be one of the last base platforms I’d even consider. Most people who run these speeds in sanctioned bodies have completely engineered chassis and spend a lot of money.

Your drive line – as described so far – is not capable of sustaining this performance.

Your engine – as described so far – is not capable of producing the necessary output. It’s a lot easier to get the horsepower you’re looking for in a big block or at a minimum, a stroker motor. I have been party to couple 383’s that run mid 10 seconds, but they’re real expensive – one of which started with a Dart block that was $2,000 – just for the block. These were 11:1 engines with aftermarket aluminum heads and mechanical roller cams. One used a Victor Junior manifold and a Demon carburetor. It was not street friendly at all but it did push a 1967 Nova with a modified B&M TH400, 4200 stall and 4.30 read end (3150 pounds w/fuel and driver) to a 10.66 ¼ mile.

If you’re thinking less than $10,000 for engine, $5K for chassis modifications and another $5-7K for drivetrain you be disappointed. Some may tell you they can go fast for less, but I’ve never found a rule compliant 10 second car that doesn’t cost a lot of money.

Just my 2 cents,
Glenn

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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Originally Posted by techinspector1

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/
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I'm always learning! Thanks, Tech - you probably wrote a lot of this manual, eh?

Originally Posted by glennsexton

I'm always learning! Thanks, Tech - you probably wrote a lot of this manual, eh?

Yes Glenn, some of my verbage is still in the NHRA Rulebook. I don't ever talk about it, because it's too hard for the average guy to believe that a dumbass like me ever wrote something for NHRA.

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