Gearing?

[jasonw]

Can somone please read me the gearing for dumbys book? Smaller pinion and larger spur= more tourq corect?

[Grizzbob]

Well, that's a yes & no. Yes, a smaller pinion & or bigger spur will mean better acceleration, but it has NO effect on how much torque a motor produces. Just think of it in numbers, when you take the number of teeth on the spur, divide it by the number of teeth on the pinion, & then multiply it by the outdrive ratio of the transmission. So for example, on a TC3/TC4, you take a 100 tooth spur divded by a 32 tooth pinion you get 3.125, & multiply that by the transmission outdrive ratio which is 2.5, so you get a final drive of 7.8125, now if you go down 1 tooth on pinion, your final will be 8.064(100 divided by 31 x 2.5 = 8.064), & with the numerically higher ratio, your car will accelerate more easily, while the numnerically lower ratio will give a better top speed(& this all assumes your tires are always the same in diameter, but that's another formula that we can go into later)..... :cool:

[jasonw]

How do you find out the outdrive ratio? More specificaly I am trying to regear an RS4 MT "All belts" if that makes a diference.

[Grizzbob]

Hmm, not sure about that one, but if you have an owner's manual, the outdrive ratio might be in there somewhere....