Originally Posted by skalogre
Well, Nordschleife would qualify as a fast track with high speed sweepers, no?
The Ring does have a couple of high-speed sections, but there are also a lot of technical sections, which is one reason why car companies that care about performance test there.
Weight isn't necessarily less of a disadvantage for high-speed tracks --- it depends on the rest of the car, how it's designed, and how you're driving it. In slower sections where you have a lot of transitions, weight can slow you down by affecting how quickly the car transfers weight, but high-speed sweepers are also affected by weight since you can generate large lateral loads in them. The tires have to react against those loads, which are proportional to the weight of the car. And if you have to brake for a slow corner after a high-speed straight, your brakes will be affected by the weight since the kinetic energy you have to dissipate will also be proportional to your weight.
But there are lots of things you can do to make a big car nimble, so big doesn't necessarily mean clumsy. I once got a ride around Buttonwillow (a very technical racetrack) in a bone-stock E65 745i with 4 people on board, and we were passing solo E36 M3s shod with R-compound tires in the advanced group. The AC and traction control were on because no one could figure out iDrive to turn them off.
For another example, the Nissan GT-R is very heavy (about 4000 lbs), and outperforms sportcars many times its price. Check out the graph in this article (which is also a track map of Buttonwillow):http://www.roadandtrack.com/assets/d...ct_OnTrack.pdf
The article itself is:http://www.roadandtrack.com/article....rticle_id=6594
The most incredible thing about the GT-R was that it carried 5 MPH more through the esses and the bus stop (the part between Cotton Corners and Riverside) than either the Porsche or the Corvette. That is totally ridiculous for a car that's 800 to 1000 lbs heavier! Having driven this configuration of the track, I know that those sections are very technical and require great handling, so while weight is important, so is the rest of the car.