[Tommy]

Larry,
My Cobra is not a SPF, but I've spun it at least twenty times on various tracks. The simple, but worthless, answer to your question is that you likely demanded more of one or more tires than they could give. The usual suspects are entering turns too fast or exiting turns with too much power. The quickest way around a race track typically involves getting as close to loss of control as possilble without stepping over the line. The only way to avoid losing control on the track is to drive like you do on the highway and don't stray too close to loss of control. Of course that will give you a slow lap time and leaves me wondering why you'd go to a track to drive that way.

One of the safer ways to learn what you and your car can and cannot do is to participate in SCCA Autocross events. The speeds and venues are usually safe enough to allow you to step over the line and lose control without doing any serious damage. After you get comfortable at autocross, step up to faster track day events where the consequences of loss of control can be a lot higher.