S14 Rear Roll Centre

[260DET]

S14 Rear Roll Centre

Firstly, is there any simple way to calculate the roll centre? My problem is with a transplanted S14 cradle setup, the rear ride height is too high but I don't want to adjust it down less than with the lower control arms (LCA's) sloping down a bit towards the wheels which would approximate stock I guess. As far as I know to raise the centre the cradle would have to be raised higher relative to the car which is not practical or else raise the LCA's inner pivot points or lower the outer.

First things first though, how can I work out the roll centre height?

[GTSBoy]

Hi Richard,

Roll centre is not "calculated" so much as drawn, by extending lines through pivot points and so on.  A bit of a pain in the arse actually.

Perhaps the other way to tackle this question is to rephrase it "how can I lower the car without changing the nearly perfect angle of the LCAs?".  To which the answer might be to direct you to GK-Tech's drop spindles for the rear.  You could/should go have a looksy at their stuff.  You can see the whole rear end kit here or just the spindles here.  The knuckles do kind of need some or all of the arms to get the best result.

Have a squiz at this thread too.  Some good stuff to look at.

Edited April 3, 2017 by GTSBoy

[260DET]

GTSBoy  That GK-Tech stuff looks pretty good, particularly like all the R&D that has gone into those rear suspension bits. Will be getting a set of their dropped tie rod ends for the project car.