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Originally Posted by phoenix
I'm not sure I agree.
With wheel frequencies this high the tyres give less grip when accelerating, braking, touching kerbs or rumble strips and in bumpy corners - problems which are eliminated by lower wheel frequencies. We find, therefore, that anti roll bars are the best way to increase roll stiffness without compromising the job that the springs primarily have to do.
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What sort of car do you work on Phoenix? Does it have a third spring?
For roll your set, but what about pitch? If you have stiffer springs you can run a lower chassis ride height without bottoming under brakes. It's hard to say one is better than the other.
If you have stiffer spring, you can lower ride height (and COG) and the lowered COG may make up for the loss in tyre compliance due to stiffer springs.
Dropping the springs and adding more bars will mean a higher ride height (unless you run a lot of anti-dive and risk killing front tyres). Also don't forget the effect bumps can have on the ride component of ARB's. You don't want the ARB having too great an effect in the braking and turn-in zones if it's especially bumpy.
And also, don't rule out using different ratio's front to rear. At a track like Catalunya, Phillip Island etc, you might want a relatively stiff front bar for the long corners, so you only need softish front springs. At the rear however, a stiff bar will hurt corner exit balance, so a lower bar and using stiffer springs to hold the car up could be in order.