Hey guys,I'm seeing a lot of talk about causes understeer and oversteer. I just want to bring up a few things about understeer for now. First of all, the main causes of understeer on track typically comes from the drivers INITIAL steering input. By turning the wheel too quickly on the initial turn in,causes the front tires to slow their rotational speed that will cause understeer. Keep this in mind, grip in the tires only works when the tire is rolling.ABS for example keeps the wheels from locking up giving you max brake without lock up which would cause the car to skid instead of slow down. That point where we get max brake pressure and we are on the edge of lock up is what we call threshold braking in race cars. It is the technique we use in cars that DO NOT have ABS.So if you have ever had understeer and all of a sudden felt the front tires grip again,that is the moment your front tires started rolling again... Second of all, another common way that we create understeer is by over slowing the car on corner entry,which forces us to get back on the throttle which causes understeer as wheel. We typically don't ad throttle until we have reached or are about to reach the apex (exit of the turn)because we need to be able to unwind the steering wheel in order to not get understeer because we are accelerating. So.Let's assume you are doing everything correct and you are looking to ad performance to your car. Typically on a track for car setup we always stiffen the chassis no matter what surface we are on.Rally,Road Racing,Baja,whatever. Stiifening up the chassis reduces the amount of time spent waiting for the car to "Set" as we call it.Just think of a cup of water sloshing around and what we are doing is essentially freazing some of that water so there is less weight to slosh around and the cup/car becomes more responsive to our inputs. The suspension(Coilovers,springs,etc) however, are adjusted according to track surface. The bumpier the track typicallly the softer we tend to put the suspension to keep the rubber on the ground. The smoother the track the stiffer we can make the car in order to reduce weight transfer delays and get back to the power. I wish I could give you a black and white answer...Generally,for a street car like the sonic,it needs to be stiffened up significantly.
Conclusion: If you are getting understeer I would suggest taking some air pressure out of the front tires,soften up the front dampers or springs to start... also,slow down your initial turn in.(This is a small fragment of time) For that brief moment you begin to turn the wheel make it smooth,you can speed your steering up once you have transferred some weight to suspension. Hope this helps..
Ray