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Old 09-29-2008, 10:44 AM   #1
nib
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Default 17.5 gearing choice

i was trying to find a starting point for gearing in tooth # pinion and spur 48pitch for my tc5 on rubber tires short parking lot track with a 17.5 novak and a 5000 lipo any input would be great
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Old 09-29-2008, 11:00 AM   #2
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prob start around a 50mm rollout and watch the motor temp

no hotter that 160
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Old 09-29-2008, 11:27 AM   #3
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i was trying to find a starting point for gearing in tooth # pinion and spur 48pitch for my tc5 on rubber tires short parking lot track with a 17.5 novak and a 5000 lipo any input would be great

Most folks here, we recommend them start the Novak 17.5 at a FDR of 4.0, which for you using the stock spur gear, 87T 48P, will be either a 43T pinion and FDR of 4.04 or the 44T @ 3.95 and an upper temp limit of 170-175 degrees after a 5 minute run per Novak. We do have some folks depending on the chassis, go as low as 3.5 FDR.
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Old 09-29-2008, 11:31 AM   #4
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Hey, Ron. you planning on running stock sedan? Here is novak's gearing chart for their brushless motors.http://www.teamnovak.com/tech_info/b...r_gearing.html
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Old 09-29-2008, 04:58 PM   #5
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yep stock sedan in my future,thank you for the gear chart,im thinking of running 17.5 this weekend but i'll be running nitro sedan for sure no oval though cars broken plus no money after getting 1/5 scale mods
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Old 10-02-2008, 02:54 PM   #6
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Hey, Ron. you planning on running stock sedan? Here is novak's gearing chart for their brushless motors.http://www.teamnovak.com/tech_info/b...r_gearing.html
Great info. I built a spreadsheet for my car using the math at the bottom along with the internal ratio for my car. With 2 different Spurs, 78 and 85, I should be able to get my Touring car from just under 3.5 to 4.5 Final Drive Ration with only 8 different pinions. I calculated the rollout to be between 1.819 and 2.389 inches with the same pinions and spurs. Print once, tape it to my box and check my temps.
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Old 10-02-2008, 09:32 PM   #7
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I ran my Trinity Duo 17.5 last race meet geared FDR 4.1 was quite competitive, motor came off at 106f, using 2s Lipo and Sphere TC speedy.
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Old 10-03-2008, 08:56 AM   #8
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4.1 final drive, and only at 106f? that's impressive. you could drop to 3.0 or lower and still be at normal temps.
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Old 10-03-2008, 10:07 AM   #9
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Losi Type R here, running 118/53 for a FDR of 4.08 both a Trinity duo 17.5 on a Losi Xcelorin speedo, and a Tekin Redline 17.5 on a Tekin RS speedo were pretty happy at that ratio.

High 3.xx to low 4.xx should get you in the ballpark for rubber. YMMV for foams...
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Old 10-03-2008, 12:15 PM   #10
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you guys are talking crazy for me haha. I had my 13.5 geared at 4.5 forever, always came off between 155-185 depending on ambient temps. Now ive switched over to 17.5 and started as near as the Novak recommended 3.5 FDR. It was fast and competitive and coming off around 130-140. I was at 3.48 and went up another tooth on my pinion (geared 80spur/57pinion on my cyclone) and it was still coming off in the mid 140s.

Granted i use the LRP brushless/brushed heatsink motor fan thing. My friend with his xceleron 17.5 is geared at like 3.2 right now!
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Old 10-03-2008, 02:52 PM   #11
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with a 78 T Spur, 46 T Pinion and Chassis ratio of 2.059, I get real close to and FDR of 3.5, without modifying the car, I only have one more 64 pitch pinion left according to the Robinson web site.
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Old 10-03-2008, 03:20 PM   #12
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you guys are talking crazy for me haha. I had my 13.5 geared at 4.5 forever, always came off between 155-185 depending on ambient temps. Now ive switched over to 17.5 and started as near as the Novak recommended 3.5 FDR. It was fast and competitive and coming off around 130-140. I was at 3.48 and went up another tooth on my pinion (geared 80spur/57pinion on my cyclone) and it was still coming off in the mid 140s.

Granted i use the LRP brushless/brushed heatsink motor fan thing. My friend with his xceleron 17.5 is geared at like 3.2 right now!
Just so wer'e comparing apples to apples, I figure I should ask...

IS this rubber or foam you're running, and what sort of a track? I"m on rubber on a medium sized carpet track... If I went down to a big asphalt track i'd probably gear a lot taller... At Blue Diamond, we're gearing 10.5's at around 4.3 I'd think the 17.5's there would need to be in the low 3's, but no one runs 17.5 there...

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Old 10-03-2008, 06:09 PM   #13
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oh sorry. Medium to large asphalt outdoor track.
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Old 10-03-2008, 06:29 PM   #14
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is anyone running there 17.5 at 4.0 ~ 4.5 FDR ?
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Old 10-03-2008, 06:41 PM   #15
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is anyone running there 17.5 at 4.0 ~ 4.5 FDR ?
Only the slow guys that don't want their motor to get warm.



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