I have a 2005 with stock staggered wheels, stock sway bars and Ohlins DFV set in middle setting for street. As is, does this set up has a bit of oversteer?
Do you recommend adding an Eibach front sway bar to the setup? Thank you.

 

Have you set rear spring preload correctly ie 10mm +

 

Not sure about 10mm (1cm). The manual said 1mm for both front/rear which we set it at that.

 

I would drive the car on a track to see if it oversteers

 

Check if you got the latest instructions because they revised that 1mm preload to 9mm and then to 10mm for the "updated" kit with softer rear spring.

 

You guys are right...Now I remember. The front is 1mm and the rear is 10mm preload. That's where she sits now.

 

Tell me your spring rates,and I'll plug all your numbers into my suspension calculator and show you how your front rear bias has shifted compared to stock, and how ot compares to all other years stock setup.

You'll also see how natural frequency compares.

 

It's the Ohlins DFV 10k/8k. Thanks

 

Here is the static bias for your current setup, which is shown on the bottom row. Note your stock swaybars of 300F 311R & springs of 560F 448R have been input into the orange fields. The results for your car are all the fields to the right of the orange fields.

Your Natural Frequency is maintained at a comfortable (for a sportscar) range of near 1.5-1.75, yet you've maintained a decently higher front rate than rear (which is desirable for street comfort, to avoid hobby-horse ride over bumps. You want the front and rear to stop undulating at the same time, and since front hots bump first, it needs to be stiffer than rear to achieve this result. The longer the wheelbase, the more that front needs to be higher than rear. On our short wheelbase cars, just keeping front greater than rear by any appreciable amount is sufficient).

f you look at Overall Balance columns for stock 2004-2005, you'll see its 55.8%F to 44.2%R. Your setup has shifted the bias forward significantly, to something just short of CR bias. You've done this while also increasing the wheel rate significantly more than CR. So if track performance is your goal, you've done a fantastic job selecting components.

You are now at 58.9%F 41.1%R (a stock CR is 59.2%F 40.8%R).

Use this link. Edit the Orange fields to your spring and swaybars.

Front Spring 560
Rear Spring 448
Front ARB 300
Rear ARB 311

Suspension Calculator Instructions

Suspension Calculator

If you can read it, here are your results:

 

Really appreciate all your help Car Analogy (and everyone else).