I bought two of the new cars. The RX500, and the '92 NSX.
All I did for tuning before these races was to lower the cars all the way, then up 5 ticks. Then I changed the diff to add more braking sensitivity. I always do that to MR cars.
Both of these cars are well balanced. The NSX is fast off the line, but the RX500 is fast (once it gets going), and feels really light and very nimble.
9th to 3rd
11th to 3rd