How to...

Old 02-04-2004, 03:43 AM
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Default How to...

Hi all...i'd like to find out what factors determine which motor and pinion to chose given that the spur is 98T and internal drive ratio of 2.435. Thank you very much.
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Old 02-04-2004, 03:54 AM
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Default Gear selection

What motor are you using? Determine the final drive ratio first, it is different for different number of turns in motor.

For example, for me, the final drive ratio is about 6.5 recommended by novak for my ss.

Since your internal drive ratio is 2.435, then you can use this formula.

2.435 x 98 / no. of teeth on pinion = 6.5

No. of teeth on pinion = 2.435 x 98 / 6.5
= 36 teeth
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Old 02-04-2004, 04:07 AM
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ok...but what factor determine the final drive? i've a 35T pinion running on 10 turn single quad magnet modified. was told my present set up will burn my motor very soon.
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Old 02-04-2004, 08:55 PM
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Default Drive ratio for 10 turn

If u are using 35t pinion, your final drive ratio is close to 6.5.

This is too high, you should gear it lower ~ maybe between 8 to 9 final drive ratio.
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Old 02-05-2004, 02:24 AM
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oh..ok.
is it high fd = low number and vice versa?
high fd is for wat? high speed or high torque?
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Old 02-05-2004, 04:04 AM
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Default Drive ratio

Actually I am kind of confused when I use high and low for final drive.

Anyway if ur final drive ratio is smaller e.g the number is slower, the speed is faster but less torque.

If the number if higher, the slower and higher the torque.

Gear between 8 to 9 should be OK for a 10 turn motor.
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Old 02-05-2004, 07:02 AM
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thanx bro for the info. i;m still running in the motor. fd is about 8. max throttle output 30 %. can already feel the rush...cannot wait to go 100% full throttle...so hows ur car? set it all up already?
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Old 02-05-2004, 04:37 PM
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Default My Pro 4

Still fine tuning it, will be going down to BK tomorrow on Saturday.

Hope to see you in action there.
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Old 02-05-2004, 08:35 PM
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Default Re: My Pro 4

Originally posted by leekayliang
Still fine tuning it, will be going down to BK tomorrow on Saturday.

Hope to see you in action there.
me in action?hahaha...hope to play there too when i'm free....
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