corneileous
RCTalk Champion
Hey guys, just to take out a lot of the guess-work of figuring out what a good spur/pinion combination is now that I have a new motor mount that allows for more options, what's a good combo? What do you guys use?
I started out with a base 2.5:1 ratio using a 15T pinion and a 38T spur and although its good, my converted Revo 3.3 on 4S just doesn't seem to have the speed as my pretty much stock Maxx running the same battery and it feels like it has a little bit too much torque because without the wheelie bar and even with 500K weight diff oil in the center diff, it will flip itself over on it's top if you're not careful. Plus, even with fairly hard running in warmer weather, my motor, which doesn't yet have a heatsink or a cooling fan, will only get up to barely 115 degrees so I'm pretty sure the motor can handle a lot more higher-gear tuning to get some more speed out of it because you would think that even though this truck is heavier, with the Hobbywing Max8 G2 ESC and larger 1/8th scale 2550Kv motor, it should run circles around my Maxx.
I haven't yet ran it yet after doing this because its over a hundred degrees yesterday and today and will be for the next week but yesterday after I put on my new motor mount, I had a 16T pinion that replaced the 15T pinion so according to my math, the 16T/38T combo brought my ratio up to a 2.37:1 ratio from the 2.53:1 ratio it was at with the 15/38T.
If I can find one on Amazon, I'm kinda thinking I'd like to try a 17T pinion with the 38T spur that would raise it even higher to a 2.23:1 ratio. Or, I could buy the 18T pinion I did find, and put that on with my 40T spur and get almost the same ratio which would be 2.22:1. Thoughts?
Oh, and I might add that I run the bigger and heavier 6.4 or 6.5 inch Traxxas Talon EXT tires as well. The transmission is virtually the same as stock except for that it has been converted to forward only and has first gear deleted.
I started out with a base 2.5:1 ratio using a 15T pinion and a 38T spur and although its good, my converted Revo 3.3 on 4S just doesn't seem to have the speed as my pretty much stock Maxx running the same battery and it feels like it has a little bit too much torque because without the wheelie bar and even with 500K weight diff oil in the center diff, it will flip itself over on it's top if you're not careful. Plus, even with fairly hard running in warmer weather, my motor, which doesn't yet have a heatsink or a cooling fan, will only get up to barely 115 degrees so I'm pretty sure the motor can handle a lot more higher-gear tuning to get some more speed out of it because you would think that even though this truck is heavier, with the Hobbywing Max8 G2 ESC and larger 1/8th scale 2550Kv motor, it should run circles around my Maxx.
I haven't yet ran it yet after doing this because its over a hundred degrees yesterday and today and will be for the next week but yesterday after I put on my new motor mount, I had a 16T pinion that replaced the 15T pinion so according to my math, the 16T/38T combo brought my ratio up to a 2.37:1 ratio from the 2.53:1 ratio it was at with the 15/38T.
If I can find one on Amazon, I'm kinda thinking I'd like to try a 17T pinion with the 38T spur that would raise it even higher to a 2.23:1 ratio. Or, I could buy the 18T pinion I did find, and put that on with my 40T spur and get almost the same ratio which would be 2.22:1. Thoughts?
Oh, and I might add that I run the bigger and heavier 6.4 or 6.5 inch Traxxas Talon EXT tires as well. The transmission is virtually the same as stock except for that it has been converted to forward only and has first gear deleted.