nib

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

RaceAce701

iTrader: (87)

prob start around a 50mm rollout and watch the motor temp

no hotter that 160

ercwhtsd

iTrader: (1)

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.

Foxxrocket

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

nib

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

liljohn1064

iTrader: (17)

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.

nexxus

iTrader: (315)

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.

Foxxrocket

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.

Red Rashondik

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...

Syber Serulean

iTrader: (28)

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!

liljohn1064

iTrader: (17)

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.

Red Rashondik

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...

Red

Syber Serulean

iTrader: (28)

oh sorry. Medium to large asphalt outdoor track.

SteveJa

iTrader: (17)

is anyone running there 17.5 at 4.0 ~ 4.5 FDR ?

Matt Howard

iTrader: (6)

Only the slow guys that don't want their motor to get warm.



Hi Steve!