[jhautz]

I am assuming this is for a revo based on your name....

The reality is the motor is rated for 60,000 rpm, but running them at over 40,000 really effects the effiency and generates a ton of heat. If you are planning to get a neu motor, choose the voltage you are planning to run and select the Neu motor that will generate somewhere in the 35-40K rpm range on that voltage. That should gice you a nice reliable setup.

My personal recomendation would be to get the 1515/2.5 on 5s and call it a day. Trust me that setup will put a big grin on your face.

If you havent seen one of these setupos run on 6s be prepared. Its a TON of power. I bash my revo on 5s and can easily out accelerate and outrun my buddies LSP that has a Fully Moded Novarossi 28 in it. 6s just breaks parts in the drivetrain every time you run it ands will take a significant investment in the drivetrain to make it reilable.