Whatever you have and can afford to run!
In reply to Allan :
In the "affordable to walk away from after wadding up" category there's not really a car that doesn't need some upgrade in the cooling or brake system. Cheaper cars always have compromises when you're hard on them.
Something I would add that's missing from the above is: choose a platform you love and think is cool.
It's a lot easier to build, service, maintain, tune, and debug a car if you think it's cool.
When I got into racing, I chose a 190E 2.3-16 Cosworth. Not the most practical choice, but I loved the platform and enjoyed messing around with it for over 10 years. Even if I wasn't the fastest guy I didn't really care because I was having so much fun.
Now I've moved on to the E30 M3 and it's the same story. I could have gotten a Spec E46 for half the money ... but who cares? To me the M3 is cool 😎 and the E46 just isn't something I'm passionate about. Easy choice.
The answer to any "what's best" clickbait thread is: Best means different things to different people.
As a track junkie and instructor for the past 25 seasons the cars I most often see being used at HPDEs are Miata's, mustangs, Caymans and E36 and E46 BMWs. Do not track a car you are still making payments on😁. Also research the known weak points on each chassis and drivetrain and correct them before going on track.
Upgrade the driver's skill before upgrading the car. So many newbies bring a heavily modded car to their first track day. This is a slow and dangerous way to learn.
Rather find a car that is dead nuts reliable so you can maximize your seat time. Cost of consumables and aftermarket support are key.
Lastly, I prefer low mass, RWD cars that carry equal weight on all 4 corners so you can learn how to trail brake and throttle steer; that is the fastest way around the corners.
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