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Whats typical gain going to 15x3.5 skinnies and 15x10 rears?

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Old 10-14-2011, 12:49 PM
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Originally Posted by Dirty Vegas
Most wheels and tires aren't that much lighter. I've been doing a lot of research before I buy a new setup for my jalopy. My stock 5 spoke 16 inch Camaro wheels should weigh between 19-20lbs a piece, so we'll call it 80 total. My 255/50/16 ET Street Radials weigh around 29lbs a piece, and my front tires are some cheapo Falken 235/55/16's that are probably around 35lbs each. 208 total lbs in wheels/tires. New combo -

Hoosier Drag Fronts - 11lbs per 22lbs total
Hoosier Drag Radials - 24lbs per 48lbs total
Weld RTS Fronts - 10.2lbs per 20.4lbs total
Weld RTS Rears 15x8 - 13.49lbs per 27lbs total

Total new wheels and tires - 117.4
Which saves 90.6 lbs and should be worth a tenth.

Your other gains would come from less rolling resistance due to the narrower front wheels. As far as rotational vs. static weight, it doesn't really matter. You're only really losing 22lbs from the drive axle wheels and tires. If you wanna multiply that x4 =88lbs it would come up with your tenth that way as well. Removing unsprung weight would make more of a difference than rotational. Hope it helps you make a decision.
Pretty damn good logic you got there dirty. That jelopy seems to run just fine lol
I think ill save my money for now. Its just not worth it for me at this point.
Thanks man.
Old 10-14-2011, 02:54 PM
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Originally Posted by Dirty Vegas
Most wheels and tires aren't that much lighter. I've been doing a lot of research before I buy a new setup for my jalopy. My stock 5 spoke 16 inch Camaro wheels should weigh between 19-20lbs a piece, so we'll call it 80 total. My 255/50/16 ET Street Radials weigh around 29lbs a piece, and my front tires are some cheapo Falken 235/55/16's that are probably around 35lbs each. 208 total lbs in wheels/tires. New combo -

Hoosier Drag Fronts - 11lbs per 22lbs total
Hoosier Drag Radials - 24lbs per 48lbs total
Weld RTS Fronts - 10.2lbs per 20.4lbs total
Weld RTS Rears 15x8 - 13.49lbs per 27lbs total

Total new wheels and tires - 117.4
Which saves 90.6 lbs and should be worth a tenth.


Your other gains would come from less rolling resistance due to the narrower front wheels. As far as rotational vs. static weight, it doesn't really matter. You're only really losing 22lbs from the drive axle wheels and tires. If you wanna multiply that x4 =88lbs it would come up with your tenth that way as well. Removing unsprung weight would make more of a difference than rotational. Hope it helps you make a decision.
I am pretty sure any weight you take off off rotational mass is worth more ET wise than any other kind of weight reduction. Because the engine takes less power to turn those things.
Old 10-17-2011, 05:20 PM
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Originally Posted by IH8FORD
I am pretty sure any weight you take off off rotational mass is worth more ET wise than any other kind of weight reduction. Because the engine takes less power to turn those things.
Agreed to an extent. A heavier flywheel/clutch is better for certain drag racing applications. Bodies in motion tend to stay in motion. Like I was saying in that last post, you're only taking 22lbs off the drive axle going to dedicated race wheels and tires. And that stupid 4x for anything rotational is just that, stupid. Oh, and I'm all goofed up on cold medicine.
Old 10-21-2011, 08:04 PM
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According to chet herbert it's 1lb rotating is worth 3lb dead at wheel speed. At engine speed 1lb is worth 15lb dead.



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