[nativepaul]

Ok I think I see what is happening here. The buggys speed is limited by the gearing and the motor is unloading, as it unloads its kv goes up and the cells put out more volts resulting in higher rpm and speed.

I guess thats why Brian used 1.2v/cell in his example, (loaded kv and unloaded V aproximating a medium load at a gear restricted top speed)?

In Serum's example, is his motor starting to unload at 60kph continue unloading untill at 71kph in no longer has any power to accelerate.

If he has room to do 71kph would he be better off, putting on a biger pinion so he doesnt start unloading untill 71kph to improve his 60-70 acceleration? or is it best to compromise that high speed acceleration to get to 60 qiucker?

Too much speed and you sacrifice acceleration and can get high temps.
Too much acceleration is wheelspin and a drop in speed for nothing.
Too much temps and everythine else becomes unimpotrant.

There must be an ideal compromise between speed, acceleration, and temps, 40mph was a noobs wild guess. Where do you with your experiance think it should be?

I know nothing of the limits of an 1/8 4wd buggy. What is the speed of a buggy that is totaly limited to traction, (and im guessing all buggys will have a similar finite limit) with a given torque (XL size motor, geared to suit). For example, if I was to gear a buggy for 10 mph, full throttle would give me wheelspin untill 10mph.
Would it do the same geared for 20? 30? 40?

Can anyone with experiance with an XL and mamba max (useing electronic brakes) tell me what loaded speed I can get, before I risk cooking something?

I think im learning a lot, but it's just a noobs crackpot theorys untill someone confirms or disputes them, or I prove or disprove them.
Paul