ok. i want some SERIOUS advice

[suicideneil]

12:1 FDR? that does sound rather high for a large MT type vehicle- and only 28,000rpms on 12cells. Im no expert, but that sound like an under powered & overgeared setup... I could be wrong though.

[lincpimp]

Well, since I own Metalman's old revo with the sliper/diff setup I may be of some help.

Now I have one issue, the motor that Mailman sent me is supposed to be a 7xl, but according to BrianG's calc and my radar tests it must be an 8xl. In any case here is the speed calc with an 8xl and 46/20 gearing:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 2.2
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 20
Total Voltage: 14.8
Motor KV: 2084
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0073
Spur/Pinion Ratio: 2.3 : 1
Total Ratio: 14.40154 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 30843.2 RPM
Vehicle Speed: 36.64 MPH (58.85km/h)
Effective Speed Rate: 2.48mph/V (3.98kmh/V)
Effective KV Value: 2084
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

I am currently running 40/20 gearing and while the motor stays cool, the mm is very hot, as are the 5k batts I am using. The 46/20 kept everything much cooler. The lehner 1950 may be able to handle the higher gearing better than the feigao. I have had Griffinrn mod a mm for me and I need to install it and see how it does with this combo. I also have a pair of 4000 14.8 lipos to replace my pair of 2s 5k lipos. So 8k mah compared to 5k should help with batt temps. It is a good setup and the slipper/diff make the steering very good. Also has a low CG, so it is more stable.