I've got in varying stages of completeness the following dirt ovals.

Eldora
Williams Grove
Oswego
Bristol

The last two have Paved and Dirt versions as they trucked in tonnes of clay!

Non mandatory updates to the '57

Place collider.kn5 in the cars's folder and the two ini's in the car's data folder.

New collider in an attempt to reduce being sucked into the wall on contact.
Stronger brakes with adjustment if you need to turn them back down.(and line locker for burnouts)
Larger range for Toe adjustments.
 

cant drive the Corvette, it just wanders all over the road, like my wheel starts to oscillate...

That is wheelspin. Back off, really the thing is a pussy cat.

Williams Grove

sprintcarwinglesssprintcarvintagesprintcardirtmidgetdirtlegendsdirttrucksf1stockcars

  Can't join 'race sever' but can join 'practice server' including in a Mustang. Is my chosen skin on the server?

Eldora, an anticlockwise dirt oval, in under 15 seconds without ever turning left.* Stay tuned.

*subject to hyperbolic exaggeration.