I increased suspension travel. The other two values were copied straight from the M3 GTR car.ini for Racer. They do look a little weird...anyway I reduced them signficantly to be more like those on the GT since I know that works, but the problem seems just to get worse. Now the speedo starts at around 118 MPH. Also the car is unable to drive over bump strips from the grass to the road - it gets stuck behind them. Very strange...