Forum: HoseHeads Sprint Car General Forum (go)
Moderators: dirtonly  /  dmantx  /  hosehead

Hi all,

Just have a question on wheelbases and diff ratio differences.

Can someone explain the main differences between a 86, 87 and 88 inch wheelbase, 39, 40 and 41 inch motor setbacks for handling and set up?

Also, I have read somewhere a discussion on 4.11 and 4.86 ratio diffs but cannot find it. There was a difference in the way the car performed with a different ratio R&P.

Can anyone help me out with some info here?

Cheers

The longer the car is the more it wants to go straight. Short wheelbases turn easier and transfer weight front to rear better, but are more of a handful. Driver preference, ability and track size/speed come into play. Bigger faster race tracks with sweeping corners usually necessitate a longer car.

The more rearward the motor is, the more weight it puts on the rear tires, the tighter it makes the car. Also the more rearward, the shorter the torque tube, the more it lifts up the back of the car when you step on the throttle and lowers it when you stand on the brakes. 40" is standard. Limited sprints with heavy motors up front or light drivers in the rear & less power tend to lean shorter especially for smaller slicker tracks.

4.11 vs 4.86 doesn't affect performance much outright, just what quick change gear choices you have a little bit. Most people don't think it is that big of a deal. http://www.bsb-mfg.com/BSB_Current/new_10gear_chart.htm

 
 
 
They don't even know how to spell sprint car 
much less chromoly...http://www.ycmco.com