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Drive Ratio's

tacker
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hrd-hr30 Grand Master

hrd-hr30

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Posted
Guys i have search the forum but could not locate the answers i need.

What i am looking for is the ratio of 4th gear and the diff ratio of a R32 GTR so i can see how far out my speedo reads with the 18" wheels on.

regards

4th gear 1:1

final drive 4.111:1

but all you need to work out speedo error is the difference in rolling circumference (or revolution per km or whatever else) of the 18" tyres compared to a 225/50*16.

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tacker Mentor

tacker

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Posted (edited)
4th gear 1:1

final drive 4.111:1

but all you need to work out speedo error is the difference in rolling circumference (or revolution per km or whatever else) of the 18" tyres compared to a 225/50*16.

Cheers mate i will work it out from here, again thanks

so therefore rpm/gearbox ratio/diff ratio x wheel circumfrence ( in metres ) x 60 = kph

7000/1/4.11x.00208x 60= 212kph and not the 200 the speedo was showing while at 7000rpm and 4th gear.

Edited by tacker
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