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Old 09-29-2008, 11:07 AM   #1
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Default 13.5 xxx-s gearing

i ordered a novak xbr/ex 13.5 sytem and i wanted to now what gearing to use with it.
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Old 09-29-2008, 07:17 PM   #2
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Default from novak site

13.5 = 4.5 from
http://www.teamnovak.com/tech_info/b...r_gearing.html

These gearings should be used as a starting point, but the motor and ESC temperatures should always be used to determine the final gearing.
Neither the motor (with sintered rotor) nor the ESC should be hotter than 160 to 175° F after a five minute run. If either temperature is higher than 160 to 175° F, the gearing should be lowered until both the ESC and the motor (with the sintered rotor) are under this temperature.
The cooler the ESC runs, the better the performance of the system.

if you were to go with 5.0 gear ratio
then you would have 128 spur 46 pinion, 118/43 108/40 90/33, 88/32
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Old 09-29-2008, 07:25 PM   #3
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if you ant to know how to find your correct pinion for the correct fdr's listen to this,

first find your internal gear ratio. once you have found that with a 13.5 motor you should run a 4.7-4.5 ish. now to do so you do this math.
(this is just an example) 88/44x2.0=4.5. (i didnt do the math just an example!)
spur (divided by) pinion (times internal gear ratio)=fdr
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Old 09-30-2008, 01:13 PM   #4
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i did the math and if i use a 86 tooth spur and a 35 tooth pinion it will give me a fdr very close to 4.5 i am going to get a fan for the esc so it will run cooler
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Old 09-30-2008, 02:32 PM   #5
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4.5 FDR is for the sintered motors. He ordered an EX system that has the bonded rotor.

My suggestion. Start 2-3 teeth higher than with a good brushed stock and move up from there, keeping an eye on temps. Try to aim for 150-180 degree temps.
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Old 09-30-2008, 04:53 PM   #6
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i have the sintered rotor upgrade comeing with it so the 86/35 gearing will be good
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