Brushless setups. HELP!

[lincpimp]

Your diff ratio is wrong. The 8t has 10/43 ratio. So 4.3 diff ratio.

This helps your suggested setup, I think it will be fine with the kit gearing...

Differential Ratio: 4.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 48
Pinion Tooth Count: 13
Total Voltage: 18.5
Motor KV: 2200
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 3.69 : 1
Total Ratio: 15.87692 : 1
Tire Circumference (inches): 18.22 inches (462.82 mm)
Total Motor Speed: 40700 RPM
Vehicle Speed: 44.23 mph (71.05 km/h)
Estimated Adjusted Speed: 42 mph (67 km/h) - 6% loss
Effective KV Value: 2200