What size slicks?
Looking for a little advice on what slicks I should start with.
'66 Chevy II Four link and tubbed Blown 355 SBC 500 ft/lbs @ 3000 RPM 630 HP @ 6100 RPM TH400 with Trans brake 4:11 in Ford 9" I have an extra pair of 15x15 wheels. Hope to get it on the track this Spring. Thanks in advance Steve |
Maybe it will help if I narrow it down.
Should I go with the widest slicks I can fit under the car? Is there a point with a SBC that I am just adding unsprung weight? |
The final RPM that you are willing to turn at the finish line will be the deciding factor on the diameter. The 4.11 gear is going to need a short tire to give your mouse much leverage off the start line. a 100" roll out tire. For instance if you think you are capable of say 137 MPH in the Q. with your 4.11 gear and an auto trans with a good converter and a 100 roll out tire your RPM in the traps should be near 6240. If that sounds low RPM for your motor then you might look at a shorter roll tire. I use this rule for guessing RPM differences, for every inch change in tire roll out the final rpm will change about 75 RPM +or- a few. If you think that your hot rod is going to eclipse 137 MPH say, 145 then your RPM with the 100" tire might be 6600RPM in the traps. I am sure that you are seeing a trend here on the tire question now. The tire roll out is the paramount variable, this issue usually leaves you with a narrowing tire choice for widths and compounds. I run a 3 speed trans in my 7 second door car and of course the more tire patch you can get under the car the more forgiving the traction. When you end up with a little tire in roll out the only way to recapture the foot print is by width. If your car is not restrictive in the wheel tub area and you are a bracket racer. Most folks go for the width so you don't have to have a perfect start line every time to get out of the box. Don't run tubes in your slicks to keep the mass down and to be safe. Get what is available for roll out and get the wide one would be the best advice one could give you until you know exactly how fast your car will run the Q. your tire roll out the second purchase will be more clear once you run something of a known roll and get a result. Borrow a buddy's to see what your car likes then you will have more info to get that expieremental purchase behind you. Your 4.11 gear may be the next issue you might look at if you had say 4.56 you could look at larger diameter tires or be able to RPM with out buying shorter tires yet if the RPM's I stated are low for you.
Sorry about the bad spelling. You make your own luck, the better the info you are working with the better your luck. Have fun and Good luck |
Id run the biggest tire you have. I think your SBC will pull the 4.11 since your running a turbo 400. That low first gear in your trans will make up the difference. A SBC with a blower will leave harder than a moderate BBC without a blower. 500ft of torque is nothing to laugh at even if it is a mouse motor. JMO
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Will a 32 x 14.5-15 slick work on a 15 x 15 wheel?
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Originally Posted by ssym
Will a 32 x 14.5-15 slick work on a 15 x 15 wheel?
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Any particular brand recomendations?
I've used just about every tire brand out there, hoosier, M/T goodyear, phoenix. I've had good and bad luck out of most but the Phoenix FX tire seems to last longer, hook harder and be more consistent (run-out) your thoughts here TopspeedLowet? Thx, Cp |
I found that a Hoosier 28" Pro Dot race tire with supposedly the same specs as a Mickey Thompson, was actually 1 lb per tire lighter, and 1inch of tread wider, so I switched to Hoosier.
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Originally Posted by cepx111
Any particular brand recomendations?
I've used just about every tire brand out there, hoosier, M/T goodyear, phoenix. I've had good and bad luck out of most but the Phoenix FX tire seems to last longer, hook harder and be more consistent (run-out) your thoughts here TopspeedLowet? Thx, Cp Sorry that I did not see that you asked my 2 cents. here's a buck I hope this helps out :) |
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