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Old 08-24-2006, 09:31 AM   #1
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Gear Selection

I need help with gearing my car. I am currently running 50T, 54T spur gears, and 20T, 24T pinion gears. I have good top end speed, but need some better off the line acceleration. Can anyone help me with my senario or help me understand what it would do if I put a larger or smaller gear in. Any or all help will be greatly appreciated. By the way I have a tamiya tg10-mk.2, but I believe the principles will apply to any car.
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Old 08-24-2006, 09:40 AM   #2
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i you want more acceleration decrease pinio teeth and increase spur teeth. This will, however, have lesser top speed. If you want more top speed do the opposite, more pinion teeth and lessert spur teeth. Final Drive Ratio = (# spur teeth/#pinion teeth) x internal drive ration
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Old 08-24-2006, 09:44 AM   #3
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Quote:
Originally Posted by Rootman17
I need help with gearing my car. I am currently running 50T, 54T spur gears, and 20T, 24T pinion gears. I have good top end speed, but need some better off the line acceleration. Can anyone help me with my senario or help me understand what it would do if I put a larger or smaller gear in. Any or all help will be greatly appreciated. By the way I have a tamiya tg10-mk.2, but I believe the principles will apply to any car.
Try to use 50T/56T spur gears, and 24T/18T pinions. You'll get quicker acceleration.
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Old 08-24-2006, 11:19 AM   #4
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Quote:
Originally Posted by fritzD
i you want more acceleration decrease pinio teeth and increase spur teeth. This will, however, have lesser top speed. If you want more top speed do the opposite, more pinion teeth and lessert spur teeth. Final Drive Ratio = (# spur teeth/#pinion teeth) x internal drive ration
So if I decrease the pinion gear/increase spur gear for more off the line acceleration, this really shouldn't effect my top end speed because that will be in second gear. Just the top end in the first gear. Right?

How do you determine internal drive ratio?
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Old 08-24-2006, 11:41 AM   #5
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Quote:
Originally Posted by Rootman17
So if I decrease the pinion gear/increase spur gear for more off the line acceleration, this really shouldn't effect my top end speed because that will be in second gear. Just the top end in the first gear. Right?

How do you determine internal drive ratio?
Usualy changing one tooth on the pinion is like changing two teeth on a spur. I would try just changing one tooth on the pinion first. One tooth on the pinion should be a noticeable change. You also don't want a huge change when it shifts from first to second gear. Your engine might not like it very much.
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Old 08-24-2006, 11:44 AM   #6
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To increase acceleration : Smaller Pinion and/or bigger Spur

To increase top speed : Bigger Pinion and/or smaller Spur

Changing Pinions have more effect than spur ( maybe twice the effect ).

Another thing to check is centax spring, clutch shoe, spring tension.
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