anyone know how to reduce the amount of understeer that's built into our stock suspension? I want to give the car more agressive handling charachteristics. Right now it's got the stock WS6 package

 

In general (for any car). Increase rear stabilzer bar diameter. You can also decrease front swaybar diamater. (increase rear roll stiffness to increase oversteer, or decrease front roll stiffness to increase oversteer).

 

Increase spring rate (especially in front) to reduce weight transfer rear to front and then good shocks and struts to control the higher rates -this is GOING INTO THE CORNER

THROUGH THE CORNER can be balanced by larger or smaller bars as Tom has indicated above This is more for fine tuning. Shocks can further be adjusted to control body roll via rebound settings

 

another fine tuning (very fine tuning) method for adding oversteer is to increase rear tire pressure or decrease front pressures. I can feel a 1/2 pound difference in my Spit. The effects of a 1/2 pound are amazing on a well tuned racer.

Agood2.8. It seems that increasing front spring rate would increase understeer due to increasing roll stiffness? I have never tuned a 3rd gen for race duty.

 

Tom, stock spring rates are too soft for the front outside tire to plant and turn the car inward. They mearly absorb the extra weight rolling over onto the front of the car as it tries to grip and consequently compresses pushing the car straight with no grip until the *** end is so high and unloaded that it then comes around wildly. any car will eventually turn if you stand on the brakes hard enough. Heavier springs make the car bite sooner- too heavy and the car glances over bumps and losses traction. (and ride comfort)

Note: rear spring rate need to be raise along with the front rate for a balanced setup- Don't just go larger in front.

 

Ok I get it. I'm just not used to working with stock stuff.
thx

 

Put a wonderbar on. It really improved my ws6's handling. It makes turning a lot tighter too. + it's fun knocking passenger's heads off the window.

 

I've got a wonderbar. I've been talking to a buddy at the shop that races his IROC. He's got Ground control springs on his car with the adjustable spring perches. He's got 850# springs in the front of his car. What's the WS6 spring rate? How about the stock non-WS6 springs?

So a stiffer spring ( mainly front, but rears too for balance) and a bigger rear swaybar will help alot. Got it. How big of a rear swaybar? I've got the 24mm ws6 now. Should this be matched to the front for balance like the springs or does it matter?

 

The spring rates really depend on what you plan to do with the car. You don't want to go too stiff if this is a driver, it will get annoying. I am not familar with Fbod spring rates. As for the rear bar, this is something that is trial and error. I have not experimented with Fbods but any car will respond in the manner I described above. Bigger rear bar causes more oversteer.

My advice after realizing you have stock springs: do the spring upgrades then see if you want more oversteer. Keep in mind, if you add a bigger front bar, you will increase understeer.