Remember this setup that you said looked a little slow?
Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.83
Other Ratio: 1
Spur Tooth Count: 40
Pinion Tooth Count: 25
Total Voltage: 14.8
Motor KV: 920
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 1.6 : 1
Total Ratio: 8.33354 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 13616 RPM
Vehicle Speed: 27.95 MPH (44.9km/h)
Effective Speed Rate: 1.89mph/V (3.03kmh/V)
Effective KV Value: 920
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
That's because you were just running it in first gear!
Look at it go in 2nd!
Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.16
Other Ratio: 1
Spur Tooth Count: 40
Pinion Tooth Count: 25
Total Voltage: 14.8
Motor KV: 920
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 1.6 : 1
Total Ratio: 5.28246 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 13616 RPM
Vehicle Speed: 44.09 MPH (70.83km/h)
Effective Speed Rate: 2.98mph/V (4.79kmh/V)
Effective KV Value: 920
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Now let's use the 36 tooth spur and put it on 6S.
Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.16
Other Ratio: 1
Spur Tooth Count: 36
Pinion Tooth Count: 25
Total Voltage: 22.2
Motor KV: 920
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 1.44 : 1
Total Ratio: 4.75422 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 20424 RPM
Vehicle Speed: 73.49 MPH (118.05km/h)
Effective Speed Rate: 3.31mph/V (5.32kmh/V)
Effective KV Value: 920
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified
I'm sure the motor would give up the smoke before 73 mph. I don't think it can put out enough watts of total power without blowing the winding. Motor temps will determine it's limits though.
I'll be sure to put the motor cooling fan on this to help raise the bar. I think the 920kv motor will be best. It will make more torque than the 8 turn wind. The 920kv motor is also rated for more voltage from the factory.
Before I settle on choices, I'll do some more checking. I'll also get all 3 spur gears to allow for some fine tuning.
