Quote:
Originally Posted by dkreidel
I don't have my F10 M5 yet, but do have extensive high speed driving experience with an un-governed and tuned e39 M5. That car would hit 310 +/- kph depending on the day, but the car wasn't really stable and confidence inspiring much above 260 kph. The draft from other vehicles, cross winds, gust and very small road irregularities would cause chassis unsettlement...and angst.
I had the car in DE for some time and generally held it to < 250kph as it always seemed in control at those speeds. i did have access, though, to another E39 M5 through M engineering that was really pinned to the ground at speeds >250 kph, so it is possible to drive very fast safely. The M development car was not much fun driving around the streets of Bad Homburg and Munich; it really was most comfortable on a track.
I think aero, both body and under chassis, coupled with spec tires and suspension are the keys to driving safely - but don't forget the uncertainties of public roads and your own capabilities.
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Thanks for the input, I have also experienced some of the points you mentioned. I was once racing from a roll with DSC OFF and at 211 km/h (remember this exactly) the car started swaying left and right because of dust on road and a side-wind. I'm being inclined to sticking to DSC ON for all speeds above 150 km/h, it's arguably single most valuable safety feature to avoid losing control of the vehicle.
I also guess one should think twice before making modifications to aerodynamics and suspension of the car with respect to potential compromises at high speeds. Has anyone experienced positive/negative effect of lower springs at high speeds?
I believe testing of stock cars at high speeds was shown in this video.