atb

Not true. There was a certain 6 speed 928 that utilized negative castor in the Mask Races of 2002 held in the foot hills of Montania de la Muerte. I understand the car took the championship. I guess negative castor works fine for drag racing in reverse, just ask Carlos Hernandez.

123quattro

Idiot's guide to suspension settings:

Caster: the more you add, the more feedback you get through steering. Also makes the steering heavier. 5* is in the ballpark.
Camber: adding more keeps the outside tire square to the road during cornering. 2.5* is in the ballpark.
Toe: street cars have mild toe in. adding toe out will make the car very darty, but will also turn in like crazy on initial turn in.

john gill

Thanks for all that , I have ended up keeping the early lower arms with the later rest of , using shims to gain clearance and adjust camber from the upper a arms .
Should work well , finished it all off today , did someone I hear mention that narrower springs and perches are available for these cars ?

That would create a lot more clearance over stock .