Some useful info i found about ARB's on the AltezzaClub Nz:
ARB's are the spring steel bars that connect across from wheel to wheel. They are mounted on the chassis across the car also, both at the front bar and the rear. They allow both left & right hand suspension to move up and down together without having any effect. Hence they do not disturb the normal spring rates or make the ride stiffer.
However when the car rolls as it goes around a corner, the anti-roll bar pits the inside wheel going down the suspension arm against the outside wheel going upwards, and tries to hold the car flat. If you have massive sways, the inside wheel will be lifted off the ground and the sway have no more effect.
Surprisingly, the bigger the sway, the less grip the car has on those wheels. So a big front sway bar means more understeer, which is why the manufacturers run them like that! That's why some people only changed the rear, because they like a car that does not understeer.
You can buy after-market stiffer sways, usually rated by their thickness and the % greater stiffness over stock. Two factors affect stiffness, the diameter/type of steel, and the distance from the pivot point to the mounting eye. Most manufacturers use % stiffer over stock.
TTE red Front 28mm diam, effective lever arm 225mm
TTE red Rear 17mm diam, ELA 90, 105, 120mm (adjustable with three holes)
EIBACH are re-badged TTE & have the same specs as above.
TRD Sportivo Blue front 28.6mm
TRD Sportivo Blue rear 16.0mm
TRD Yellow Front 30mm +49%
TRD Yellow Rear 19.1mm +99%
CUSCO Front 30mm +140%
CUSCO Rear 16mm +125%
L-TUNED Front +49%
L-TUNED Rear +99%
HOTCHKISS Front 32mm +56% & +61%
HOTCHKISS Rear 19mm +144% & +227%
TANABE Sustec Front 30.4mm
TANABE Sustec Rear 18mm
HKS Front +130%
HKS Rear +116%
ARC Links Front +216%
ARC Links Rear +146%
Last edited by Dan
on Mon Aug 13, 2007 3:41 pm, edited 2 times in total.