help me pic an outrunner for my max project

[Semi Pro]

so i need some advise on a project truck im working on. im planning a center mounted out runner on a t-maxx chassis but im getting hung up on how big of a motor i need.

the goal is a lightweight MT that runs on 3 cell at the track and can top speed and bash on 4 or 5 cell

so the lighter the motor the better

there is room for a motor that is 44x80mm with a 5mm shaft

so i found this
http://www.hobbycity.com/hobbycity/s...less_Outrunner

is this the right way to calculate direct drive?

Differential Ratio: 2.8461538461538462 t-maxx diff
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 1
Pinion Tooth Count: 1
Total Voltage: 11.1
Motor KV: 500
Tire Diameter (inches): 5.9
Tire Ballooning (inches): 0.1
Spur/Pinion Ratio: 1 : 1
Total Ratio: 2.84615 : 1
Tire Circumference (inches): 19.16 inches (486.76 mm)
Total Motor Speed: 5550 RPM
Vehicle Speed: 35.39 mph (56.84 km/h)
Estimated Adjusted Speed: 34 mph (54 km/h) - 5% loss
Effective KV Value: 500
KT constant: 2.7 oz-in/A


or will this be enuff? or will it over heat?
http://www.hobbycity.com/hobbycity/s...s_35-48_900Kv_

if you know of a better outrunner for this project please post me a link

and any other advise is welcome

thanks for the help