It's been a while since I tested it, but I got a 2:18.742 with the F40 at the Nürburgring GP/F (using the DS3, not my G27), compared to a 2:15.673 in the F430 and, more tellingly, a 2:16.727 in the 288 GTO. I thought it was awful then and the F40 seasonal reinforced that... though I've heard some people suggest that the F40 seemed worse than usual at that seasonal, for some reason. I might need to re-test the car now that I've got a G27 and I'm more experienced with it. Could help. (It didn't seem to be helping my McLaren F1 times, though.
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I got a 2:34.542 when I tested it. I was happy just to successfully make it around the track and get a valid lap time. And that's SH tires. Absolutely nightmare of a car.
While tires in the '80s weren't what they were today, I still don't believe the real F40 is as horrible as the GT6 model of it would suggest,
as some people were saying over the F40's seasonal thread. I could be wrong, though—the fastest car I've ever driven was a few C5 Corvettes.