Pinion and heatsink ?'s

[suicideneil]

The diff ratio for the emaxx is in the drop down menu near the top of the calculator.
S, L and XL refer to the length of the motor, but that is for feigaos, not the neus. What voltage are you going to be running- here are a few guesses for your ideal setup:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 72
Pinion Tooth Count: 22
Total Voltage: 22.2
Motor KV: 1700
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.01
Spur/Pinion Ratio: 3.27 : 1
Total Ratio: 16.04196 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 37740 RPM
Vehicle Speed: 40.24 MPH (64.65km/h)
Effective Speed Rate: 1.81mph/V (2.91kmh/V)
Effective KV Value: 1700
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

6s seems like the best voltage for that motor. You really want a smaller spur than that though, other wise a huge pinion is required:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 66
Pinion Tooth Count: 20
Total Voltage: 22.2
Motor KV: 1700
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.01
Spur/Pinion Ratio: 3.3 : 1
Total Ratio: 16.17564 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 37740 RPM
Vehicle Speed: 39.91 MPH (64.11km/h)
Effective Speed Rate: 1.8mph/V (2.89kmh/V)
Effective KV Value: 1700
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

I think MOD1 gears would be better, failing that get some integy delrin machined spurs- they come in smaller sizes than the stock traxxas selection.

If you get a finned neu, a heatsink cant be fitted/isnt needed, but if you get a smooth can neu... they still arent needed, but any normal 540-550 motor type heatsink will work perfectly.