Quote:
Originally Posted by 2000_Black_RT10
The reason you want a IRS to squat is to align the halfshafts horizontally with the diff and the axle spindles at launch, if anyone disputes this.. they don't know what they are talking about.
Otherwise, if the halfshafts are at an angle upon launch, there is more stress on the u-joints due to the resultant angle of rotating force / moment = u-joint breakage.
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I agree with your theory, but weight transfer will naturally tend to make the rear squat. Unless you can control travel without inducing wheel hop, reducing rear spring tension to induce additional squat may allow the halfshafts to travel past the magical stress reducing centerline anyway. My drag racing experience with the Viper is still in it's early stages, but the car seems to be very predicatable with the factory ACR spring rates. No wheel hop or any rear steer associated with a soft rear set up. Drag radials without upgraded half shafts may also be problematic. There are a few long term drag racers here who may chime in on set up.