Lots of Wing and PRACTICE, PRACTICE and yet again PRACTICE.
Protland is a *** until you have done a few hundred laps and know
the limits of your car very well. Detroit is easier, since you can use
the wall to stay on the track - but that slows you down. A good lap in
Detroit is a 1:14.xxx, top laps are even faster. ANd learn to manual
shift if you don't do that yet - helps a lot on those two tracks.