Originally Posted by
ponchota
Thanks Andy, I'm still trying to wrap my head around motor sizes and gear ratios too. I know KV better than T from helis and quads. From what I understand the lower the "T" like 4.5T is faster than a higher turn motor. Since 540s are predominantly using "T" what would be a good motor? I was guessing 7.5 - 10.5T motor but what does that translate into for KV? Also gear ratios, do I just buy a bunch of spur gear and change them out until the engine temp is good?
Yes, the lower the "T" is the faster motor. In the fastest class modified we use 4.5t motors and they are stupidly fast. I would recommend between 6.5 and 10.5. KV is not so important i this case as i think all 120A esc's can handle a 3.5T.
You stay with the same spur gear value you find is good, and then you just change the pinion wich is easier becuse it is fastened on the motor axle.
Cheers//