Some thoughts on ARB's.
Stiff front bar = More understeer and more weight transfer
Soft front bar = Less understeer and less weight transfer
Stiff rear bar = More oversteer and more weight transfer
Soft rear bar = Less oversteer and less weight transfer
If the front end of the car is understeering into the corners, soften the front bar to get the turn in you want.
If the rear end of the car is loose and stepping out in the back (oversteer), soften the rear bar.
Donít try to dial it out by stiffening the front bar.
You may fix the problem (stiffening the front bar transfers more weight to the front and reduces the loading on the rear tires) but now you may find the front end is understeering as a result.
If the car is rolling too much when you cornering and lacks responsiveness, you want to stiffen both ARB's proportionately to not disrupt the oversteer/understeer characteristics.
A stiff car (stiff springs, stiff shocks, stiff ARBs) transfer weight faster, which means they require less aggressive steering inputs to change directions.
The car is more responsive and takes steering faster but if the car is too stiff the car will understeer on corner entry and can be twitchy, slide around a lot, and be difficult to control over bumps and surface undulations.
A soft car (soft springs, soft shocks, and soft ARBs) transfer weight slower, which is bad for roads that have a lot of quick cornering.
Generally speaking, ARBís that are too soft make the car sloppy and slow to respond on steering.
PH1 GTV's with ARB drop link mounting point to front wishbones have thicker (stiffer) ARB's then later cars with ARB's connecting to the shocks.