R/C Tech Forums - View Single Post - Ball diff pulley, different teeth on front vs rear theory.
Old 11-21-2010, 07:07 AM
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wingracer
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Front overdrive/underdrive is nothing new. It's one of the biggest adjustments to a 1/8th onroad car. Since we run foams, we mainly adjust it with tire size but different pulleys are available too. They have front one ways in them but that is not really the issue since we usually overdrive the front. It's not done for speed, it's all about putting all that power down off of the corner.

Bigger front tires or a pulley resulting in more front overdrive will reduce on power steering, better forward bite and stability.

Smaller front tires or a pulley resulting in less front overdrive will result in more on power steering and a SLIGHT improvement in straightaway speeds but is not noticeable and not really worth adjusting for.

The problem with doing this on your TC is that a 1 tooth pulley change may be too much. In 1/8th, the max adjustment range is really just 1.0 to 1.04 front overdrive. I suspect a pulley change will be more than that.

Also you are talking about spinning the rears quicker. What we in the 1/8th world would call underdrive. This will make the car quite lose on power off of the corners, one way or not. Also while this may SLIGHTLY improve straightaway speeds, the loss of front breaking and stability will slow you down FAR more.
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