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Old 08-22-2008, 06:56 PM
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shadow102
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Originally Posted by vazzo
Hi Guys

Im going to be running modified 6.5R Novak, do any of you run this motor and if so what gearing do you recommend, Novak state that 8.5 FDR is a starting point but I'm a little worried as I tried the 3.5 FDR on the 17.5 and thermalled the motor. Im running 48 pitch gears as well. I was thinking more like a 8.78 FDR which is a 90 spur and 25 tooth pinion. Would rather hear from the experts before I try this though. Ill be running the car mainly in the evening and sometimes during the day so I guess I will need both gearing options.

Cheers
Adrian
The reason why you thermaled the 17.5 and the reason you will thermal the 6.5 is your fdr calculations are off. It looks like you are calculating using the old 16t pulleys which gives you a 2.4375 internal ratio. Being you have a TC the 18t pulley gives you a 2.18 internal ratio
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