I made a tuning for le mans 700 ,that works quite nice.medium turbo charger,racing gear set to 310 max,differential 5/60/30 , full downforce on the rear and almost 200kg ballast to get a 50\50 weight balance.Without tuning it was spinning like crazy but now it sits quite tight on the road and is fast on the straights.Corners well.FM4 last easy 3 laps.Maybe FM3 would work as well,had only one race so far.