gearing for my driving

[CharliesTheMan]

I have a 2.5 T-Maxx for those of you who don't know. It still has a mostly stock drive train except for a motor saver and fuel filter and exhaust is on the way. Anyway, about 85 to 90 percent of my driving is in the low to mid rpm range, and I would like to change the gears in the maxx to fit my driving style. This is one subject that I know nothing about yet, so it would be great for you guys to give me some suggestions on which gear is best to change and what size gears I should get to experiment. I was thinking that it was the spur gear that I needed to change, but as I said I'm open to all suggestions. If it was a 1:1 car, I would step the rear end up from 3.71:1 to 4.11:1 gears. Hope this helps you guys to understand what I'm trying to do. Oh yea, I have the stock wheels and tires on it now and I ordered a set of factory 3.3 wheels and talon tires, and I think the outside tire diameter will be about the same.

 

[NCNitro]

It actually all depends on if you want to increase bottom end or top end. Much like the example you gave of replacing rear end gears from 3:71 - 4:11 would give you more bottom end but you would sacrifice top end. Just as the 4:56 gears I had in my AMX launched like a raped ape, but top end sucked, I swithed to 3:73 so I could drive it around town a bit more.

On the Maxx start with the spur and clutchbell. If you want more bottom end replace the clutchbell with a lower tooth count, say go from a 20 to an 18 or 17. You could also put a larger spur gear i.e. go from a 70 to a 72 tooth gear. The exact opposite would increase top end at the loss of bottom end. i.e going to a clutchbell with more teeth, or a spur with less. on my Maxx I run an 18-72 set up and it's perfect for me.

 

[CharliesTheMan]

Thanks a lot, thats exactly what I needed to know. I don't need as much top end as I have now, because I hardly ever stretch it o ut and let it get wound up to its full speed as it is. I would rather not have that much top speed but have quicker acceration.

 

[NCNitro]

Then I would try a 17 or 18 tooth clutch bell. I believe stock is 20.