I got some tips from a guy I raced online.
He taking a look at where your weight bias sat, first of all, then accordingly stiffening the rear spring rate at least .5 more than you do normally to offset the weight of the engine. Also do about -.5 degree of rear camber more than you normally do. I usually run 0 camber, so this just put me at -.5.
Once I continued to refine these suggestions, I saw all the tail happy, snap-oversteer tendencies disappear, leaving only a turbocharged cornering monster.
It might also be helpful to add that I usually run my compression rates around 8 and extension rates around 4 or 5 to keep from bouncing around and unsettling the rear end. For the stabilizer bars, I either run 4 all around or 3(f) & 5(r).
For LSD, I run 40/40/20.
My SW20 MR2's, MR-S, Opel Speedster Turbo and R390 GT1 Roadcar all responded really well to this approach. My Proto Spirro is very fast, but is still slightly tail happy & has snap-oversteer, but its drastically reduced. I find myself drawn to the turbo MR2 the most. Its broad powerband and torque make it out-accelerate NSX, FRS/BRZ and I even beat one STI off the line.
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