Originally posted by NANAKO
Do you guys know where I should start with gearing for a 9T mod for the EVOIII? Thanks~!
Gearing the TB Evo III for modified racing:
Ok here is what i have discovered.
1. Stick to 64 pitch gears (0.4 module is the same), you will not fit bigger than the supplied 96 spur gear onto the car, 112 and up appear to be too big. This calculation is based on 64mm tire/wheel diameter.
(there is no chance of fitting 86 or 90 tooth 48 pitch gears they are too big, anything smaller is not suitable). 81 may fit??? i did not have one handy.
2. A good starting ratio for a 9 turn would be 23 - 24mm roll out. This would involve using a 96 spur with a 29 pinion, i have set my car up with this combo...so we know it fits.
This is the starting ratio i use for most race meets (depending on track), i use this ratio with my 414 and Corally C4.1.
I would normally end up gearing up taller...but the above mentioned ratio is a good starting point. I's also recommend sticking with 64 pitch as the gears appear smoother and the car is quieter.
If you want a copy of my rollout chart for the 414 or TB Evo grab it via this link... (right click the link and choose "save target as")
Ratio / Rollout Chart