Re: Box frame??
Personally I don't think boxing it will help all much. The shear strength you will be adding is in the same plane as the existing frame. The twist would be corner to corner (aposing frame rails), not along the same frame rail. With out a cage you will always have some of that.
Most people mistake frame twist for axle rotation. Put a big anti roll bar in the rear and that will be fixed.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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