So Serum do you think that the twist-55 can go head to head with the high end brushed motors like the 9T and the 8T since it is almost as powerful as the Basic 5300? what speeds is it capable of? Also is this gear ratio suitable for the motor/esc in a touring car: 6.40:1?

I really have got no idea about the quality or the specs of the twist-55 motor. If it is as powerfull as the 5300 as you say it is, you don't need to worry about speed. 65mph would be easy to achieve then.. though it would be insane.. are you planning on running lipolys, or 6-7 nimh's?

The twist 55 is similar to the hacker c40 (smaller rotor than the lehner, so less torque, but quicker acceleration). That motor can compete with a 9 turn brushed motor.

What I know is that the hacker C40s is 600 watts rated, but the twist 55 is 750 watts which means its a bit more powerful. What I truly want is a speed around 45-48mph at 7.2 volts. And once again, do you think that the 6.4:1 FDR is reasonable?

The ratio is kind of tall, actually. 8:1 or 9:1 is more along the lines of where I would start for the FDR.

Do you use the same FDR for the 5300 motor? like 8:1 or 8:9

I would START with this ratio and adjust from there, based on performance, heat, runtime ec.

What speeds do you get out of these motors at 7.2 volts? my tb evo 4 shakes like crazy when I pull the throttle to 40% at 7.2 with the ratio I've mentioned and ofcourse with out making the wheels touching the land.

Mike, what is best for the K.T-55 motor: 8 mhz or 16 mhz? I want a guess from your mind. I think your guess will not disappoint me at all.

My guess is 16khz. I hope to not disappoint!

What reasons support your guess? and ofcourse whether your guess is right or not it doesn't mean that it will disappoint me for real. Its only a guess in the end. Thanks any way buddy.

I hope you guys are talking khz's instead of mhz?

Just do as discribed in the manual; use the setting that keeps the setup the coolest..

The reason for my guess is the higher rpm of the motor. Generally, these high rpm motors like higher a switching frequency. The only way to really know is to try both ways.

Okay, whats the whole thing about switching frequencies? what's the work of this function? And I'm sorry for turning things upside down. It is truely khz and not mhz. Thanks for correcting me Serum.

It is a bit hard to explain, but that frequency is needed to build up the signal. It are all pulses, and a combination of quick short pulses acts like 1 large puls.

It simple is the speed the controller have got to create one large pulse. That is why higher frequency allows you to run the motor in a higher rpm range, because the faster the motor turns, the shorter the pulses need to follow up/combine. Thought the higher the frequency, the more your controller has to work...