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Old 03-11-2011, 07:52 AM   #1
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Default Newb to TC On Road Racing!

I picked up a nice FT TC3 roller for a very good price and I figured this would be a great entry into the novice 17.5 spec class racing. I put in a Novak 17.5 SS setup.

I am trying to figure out the age old question on gearing.

The IGR is 2.5 and the spur/pinion I am running right now is 72/25 or 75/25 I forget. Either way the FDR is not working with our twisty layout and a long straight. The FDR on my current setup is 7.20 or 7.50...I need it in the mid 5's.

Attached is the gear ratio chart from Associated. But I see nothing to gear in the mid 5 range.

Can anyone help a newbie out?

Thanks in advance!!
Attached Files
File Type: pdf tc3 gears.pdf (36.7 KB, 153 views)
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Old 03-11-2011, 08:01 AM   #2
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This should get you closer.
Spur gear / (divided by) pinion = #.##
#.## multiply by IGR (2.5) = Final

80/40 = 2.00 X 2.5 = 5

Side note: I always use 64 pitch spurs and pinions .
put should be same with 48 pitch. anyone confirm!

Gear to run cooler, if you're looking mid 5's then gear closer to 6 and then run for a few minutes and temp the motor...then work from there.

Welcome to onroad, and please have fun....remember the worst day of RC is always better than a good day at work, unless of course you're work as a bartender at a strip club
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every Action has a reaction.
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Old 03-11-2011, 08:07 AM   #3
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Numbers are the same, i think it's just the diameters and availability of the gears that's different between 64 and 48 pitch.

BTW, you may want to go as low as 4.5 or even 4.0.
You'll figure it out after a few weekends.
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Old 03-11-2011, 08:33 AM   #4
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Word of warning about gearing.

Always check the heat of the motor after 2 minutes too after you change your gearing.

As you are new into r/c, it would be costly and disheartening to ruin a motor - it is for anyone!

It is good that you are asking questions though, as there are plenty of them... 15 years of racing and I still find many of them to ask

Sounds like the gearing has already been covered, once you have worked out what gear ratio you need and if your budget allows, buy pinion gears one tooth bigger and smaller each side of your preferred ratio for a bit of flexability/tuning.

have fun
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