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Old 06-27-2010, 07:33 PM
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Tire size!!!

ok we know more meat meant a better launch but too much meat is robbing hp so how much meat is appropriate for around 400-450 or maybe even 500 horses in a 3000 pound car.

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Old 06-27-2010, 08:16 PM
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Experiment

It is difficult to say what tire type, brand and size is needed and it is usually by trial and error. In 1967-1971 we had a Junior Fuel dragster (C/FD) and had three pairs of Goodyear slicks. In our case, the track condition, temperature and the altitude at the strip influenced which tires we used.

If you have about 430-450 HP, I would pick out the widest and largest diameter that will fit in the wheel wells and go smaller if needed. That is if you have a rear gear in the 4's. Try to hit the RPM at whoch peak torque occurs about 50 feet from the eyes. I had 11"- 9.00 x 15 Goodyear wrinkle wall slicks under my '69 Firebird 400, 4-speed, Crane solid lifter cam, headers, a chambered exhaust system and 4.33:1 rear gears and it seem to be perfect combination. A guy gave the slick to me to me after he blew the only engine he had. I estimate my Pontiac 412 CI engine was pulling about 440 HP at 5500 RPM, at least of felt like it. I am sure there are more scientific ways to do determine the size of tires, but trial and error is best.... if you can afford it.
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Old 06-27-2010, 10:48 PM
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Quote:
Originally Posted by 77'Omega
ok we know more meat meant a better launch but too much meat is robbing hp so how much meat is appropriate for around 400-450 or maybe even 500 horses in a 3000 pound car.
I'm thinking you're working with a basically stock rear suspension and sheet metal, right? If so, use as much tire as you can safely fit inside the wheelwells- there is not anywhere near enough room for the tire's size to rob you of anything. What you want is the best 60' time you can get, bigger is better in this case.

You will want to optimize the wheel size to fit as much tire under the car as possible, w/o interference from the springs or fender lips. The fender lips can be rolled back to provide some extra room, there are spring and shock relocation set-ups that will allow for even more tire if it's needed.

Your X-body '77 Omega is similar to a Nova, HERE is a page showing what fit in a stock wheel well. There are numerous pages showing how to measure from the suspension points and fender lip to determine fitment of tires as well.

The tire's rubber compound and construction will have as much bearing on traction as the width in almost every case!!! Nothing hooks like a soft tire, and even a 12" wide tire- if the compound is a hard "touring" type- will go up in smoke w/o giving you any traction, so this is very important.

There are drag radials that are street legal or plan on mounting your race tires on a spare pair of wheels and swap them at the track or before you go on patrol. Drag tires have a shorter tread life, obviously. Save slicks for on-track use ONLY. Not only are they illegal for street use, they will be a real hand full in the wet.

If you have already moved the springs inboard or have tubbed it, then the size could become excessive if you used the biggest tire that will fit- but I'm thinking this isn't the case- correct me if I'm mistaken on this.
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