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on a Fox chassis is the squat/anti-squat sensitivity changed by the use of a torque arm? Is the torque arm angle factored into the equation along with the lower control arm angle? What is the range of the "optimal" control arm static angle?
 

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on a Fox chassis is the squat/anti-squat sensitivity changed by the use of a torque arm?
Yes. The instant center changes location, so anti-squat changes.

Is the torque arm angle factored into the equation along with the lower control arm angle?
The lower control angle and the length of the torque arm are the important factors. See diagram below.

What is the range of the "optimal" control arm static angle?
It depends. In a slow speed, tight turn setting like autocross some degree of roll steer (greater static angle) will help. In a high speed setting with bigger turns this could lead to rear instability. So it depends what your goals are.



Here is a good discussion on TA / IC / anti-squat relationships.
 
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