Hi,
I'm a long-time TR6 autocrosser.
My suggestion would be to go to full stiff on the settings and then try to
back off 'till the car isn't completely tail-happy.
You are much better off with stiff shocks / springs in the rear than with
a big roll bar because with the roll bar you'll lift the inside wheel and
get wheel spin (unless you have a Detroit locker or maybe a Salisbury
type). I know this from experience. With a Quaife or open diff, you will
get wheel spin. I've done the big bar on my street TR6 (used to run that
car in SCCA FSP) and with the race car (SCCA F Prepared).
Stiff springs get you less body roll, less "squat" on take-off at the
expense of making the back a little bit more loose (depends on how stiff
the springs are). On rough courses, the car will be really tail happy, but
that's the tradeoff.
I hope this helps.
rml
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