Quote:
Originally Posted by Gunman
It's a matter of adding or reducing the mechanical grip on one end of the car. More grip on one end, will affect the balance, ie more grip on the front will cause oversteer, aka loose. More grip on the rear will make the car understeer, aka push.
In very general terms, going softer on the spring will add mechanical grip, going stiffer will reduce it. This is disregarding the pitch change, weight transfer change, etc.
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It's worth noting that none of this lives in isolation - every change is in relation to everything else in the system. Change spring rates significantly and you probably need new dampers.
It's possible to reduce rear traction simply by going insanely stiff on the rear damper compression setting, but it rides horribly (over 13 years I lived with that!) Increasing spring rate has a similar result to rear traction, but does very different things to ride (and eventually overpowers the damper.) Then there are setups like CSG has reported with the Tein SRC and 10/12k (F/R) spring rates and reports of a ride more comfortable than stock being achievable...
IIRC up through '14, stock BRZ front is ~2700k, rear ~3500; FRS front ~2300k, rear ~3800k.
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