I don't want to sound too much like a "know it all" but let me simply explain the dynamics of over and under steer.
MOST front engine/rear wheel drive passenger cars suffer from understeer. The main reason is that most drivers are not able to control a loose rear end, another words, the rear of the car slides towards the outside of the turn. As a result of the above, Detroit purposly built in understeer, that is, when pushing the car hard into a turn, the front end skips and hops and you effective lose steering until the cars slows down.
Most rear engine cars, and this includes the Spyder suffer from oversteer. If you enter a turn too fast, the rear of the car tends to get loose, as is the case of a Porsche, VW or Spyder et al.
Usually with rear or mid engine cars, if you lift during a turn, that is, take your foot off the accelerator, the rear of the car raises thus taking weight off the car and several things happen. In the case of a Spyder with a swing axle, positive camber (the top of the rear tires tips out) sets in and the car rolls sideways on the tread, you lose adhesion and the car goes into oversteer.
When driving cars such as late VW's and late Porsche's, positive camber doesn't set in due to their independent rear suspension that keeps the tire parallel to the road, but the rear bias weight acts like a pendulum forcing the rear of the car towards the outside of the turn.
I hope this helps. Just remember, when driving the Spyder, enter your turns with enough momentum to maintain adhesion and try not to lift your foot off the accelerator during extremly hard turns. Other areas of concern include weight transfer but that is another issue. The reason race car drivers apex a turn is to minimize weight transfer. Less weight transfer translates to a straighter line of travel equalling more speed.
(Message Edited 9/3/2003 9:31:27 AM)