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Discussion Starter #1
i have a 95' c.p.i. v-6 vortec engine and i just changed from stock tires (205/75/15) to a new set of rims and tires. the tires are now 235/45/17 with 17x8 rims. with this hamper my engine performance or enhance it. will i have a quicker start and a lagging high end or just the opposite? thank you to anyone that can help me out!
 

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Vs. the stock tire height the new tires will be off by 10%. RPM will be higher 10% at the same speed, top end speed will be down 10% and the same for speedo error. Its very close to gearing up .31. Which means the final drive ratio if you have 3:08'2 will now be 3:39, or if you have 3:42's then 3:73's for comparision.
 

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Resident Mechanic
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hmmm.....so what would be the best tire size fore 16x8 rims for good acceleration, and not lose that much top-end speed?:bash:
 

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Resident Mechanic
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hehe dont exactly have the money to try out 82 different types of tires sizes :D
 
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