Quote:
Originally Posted by Topless
... 270F/370R and it was *just enough* spring to reduce roll and make quicker transitions while still having full grip on corner exit.
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I agree with Dave. ^^^ I also campaigned a BSX Boxster and posted 16 Time Trial wins and 2 track records.
I've driven Boxster's on the street and the race track with stock, 200, 270/370, 450/500, 650, and 800 spring rates. As others have said, there is no single perfect spring rate, because the springs have to match the rest of the components, setup, etc.
For any
street/road going car, I would say that the BSX setup with 270/370 springs (the Bilstein PSS9 spring that comes with the shock) is a great trade off between stiffness and compliance.
I've driven thousands of street miles (and 100 races) on the 450/500 springs in my Spec Boxster and this setup is incredibly awesome when the roads are nice and smooth, but its generally too stiff for sporty street driving because the roads are often too rough resulting in a loss of traction, especially under hard braking and hard acceleration.