I am really puzzled by my small car build with balloon tires (55976). I tried swapping between an XL and an M (PF) motor, both geared down (up?) to about the same torque (I tested by how sleep a slope it can climb), both motors virtually run the car at the same speed.
I would have thought with the same torque output (just about 3-4 cogs of different sizes in both cases till the differential) the XL would give me much higher speed, at least 1.5 times if not twice, but to the contrary it looked to me like the M motor runs a hair bit faster.
Any ideas guys? I know this is a bit generic, but what could it be?
- there are frictions but in both of my cases they should be roughly the same
- the XL motor is quite a bit heavier
- the IR receiver (v1) has limited output or my batteries don't? (6 AA kind), there is only one more M motor (for steering, so it is off during my test) on the IR receiver, IR receiver attached to the battery box directly
- I am using 2 u-joints for the drive axle instead of a cv joint - could that make so much of a difference?