These were the steps I went. My car came with 285/345, Swift R springs, Stock shocks and Sway Bar. Car was understeer.
1. Rear Eibach Sway Bar in. From middle setting first and to stiffest at the end. Car was mild oversteer under power and neutral/understeer when lifted. That was a good improvement.
2.Handling still not so good in straight line and corner. I changed to coilover set with spring rate 900 and 550 and got rid stock shocks. (I don't think spring are stiffer than Swift R) I use my car daily so I did not go stiffer spring. Shock upgraded is the key here. Good improvement. Car was stable and confident in turns.
3.While in processed of 2., I changed tires to R888R which were stickier than PS4. When in turns, car still leaned pretty good. I changed to Whiteline sway bars. Right now Rear only with middle setting. Whiteline is stiffer than Eibach. Middle setting is stiffer than Eibach stiffest. After some miles I will try Whiteline in the front, I think front at softest setting should be good enough.
Reference car that I try to make GTR come close a bit. My garage queen, 996 turbo with 2wd conversion. GT3 suspension upgrade. KW Clubsport Coilover. AKA poor man GT2.
If you want to stay with PS4 and stock shock, Eibach might be ok and cheapest route.
I'm planning to buy Eibach sway bars because I want to have sharper handling FEEL.
will they really make a big difference?
and for those who are using Eibach Sway bars,
do you guys use the stiffest setting to have the sharpest handling feel?
Edited by aroonkl, 21 April 2021 - 07:24 AM.