Any of you transformed a cherished longtime automotive possession into a full time race car?

Case in point...say you have a relatively nice sports car that you've owned for several years. You've maintained it faithfully, rebuilt things as they've worn out, upgraded performance accssories, etc along the way.

It was once a daily driver but now it's being used as a weekend toy and occasionally for a track day. Because of the age, mileage, etc. it will never be a rare collectible...at least not in your lifetime. But it's still worth pretty much what you originally paid for it.

At wgat point and how do you decide it's time to make it a dedicated track/IT car?