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Old 10-11-2012, 10:17 PM   #1
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Default vta gearing? help needed

i just picked up a used tc3 to try out vta racing and not sure were to start for gearing. im running the novak 25.5 on 2cell.
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Old 10-12-2012, 02:05 AM   #2
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I would start at a 3.7 and go from their, make sure you have a fan blowing on the motor.
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Old 10-12-2012, 05:45 AM   #3
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Check with your local track and see if they are running set gearing. Here, we're running 5.0 and the cars are plenty fast. This Summer, with open gearing, most were running 4.0. That seemed about perfect for this class.
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Old 10-12-2012, 12:00 PM   #4
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It is track size and layout dependent. 4.0 is usually a safe starting point. You also should not have to make any major modofications to run a 4.0 in a TC3. You are toeing the line at grinding some of the chassis webbing away under the pinion (to fit a larger one). The next mod to lower your FDR more involves grinding the motor cam so the motor can be closer to the driveshaft (smaller spur fitment). If you get that far, be careful of an on motor heatsink or fan rubbing the shaft.
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Old 10-12-2012, 12:24 PM   #5
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TC3/4's are a little difficult to get the FDR down lower for brushless, since the internal ratio is 2.5. You have to go with a pretty small spur. In 48 pitch gearing, I would suggest this spur since it is fairly easy to find and would be a good place to start:

http://www3.towerhobbies.com/cgi-bin...?&I=LXEY18&P=7

In 64 pitch, something in the 82-86 tooth range would probably be a good target as well. We run 4.2 in our local VTA since we run 21.5's. So, I run a 84/50 spur/pinion. Like this:

http://www3.towerhobbies.com/cgi-bin...?&I=LXYLH3&P=7

Note: You will likely have to grind the chassis supports under the pinion gear to allow the large 64p pinions enough clearance.

Last edited by redbarton; 10-12-2012 at 12:45 PM.
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Old 10-12-2012, 01:49 PM   #6
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jesse do a 81spur with a 47 or 50 pinion! thats what i got in my tc4! and there the same ratio!
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Old 10-14-2012, 09:45 PM   #7
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ok sounds like most people are running around 4-4.5 the chassis and motor cam are both grounded down from the prior owner so thanks on the tip about the heat sink. anthony is your car running hot with that gearing?
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