What bushings are in your control arms? Flexible bushings (i.e. rubber or urethane) require a little more negative pinion angle than solids. Also, what is happening to the tires? Are you blowing them off? I would assume so with a 120mph trap speed! hehe
If you are using all solid bushings and the air bag, I would suggest a pinion angle of -1 to -2. With rubber bushings you might have to go as low as -4.
Andy
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88 coupe
91 LX NMRA Pure Street 5120
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