I was looking through lap times of different production cars, and there are some wildly out of place cars doing ring laptimes, some cars are faster than they seem they should be, while others are slower than they should be. Which got me thinking how some cars truly get tested in showroom condition, and others get the “marketing” treatment to produce a laptime a showroom car would never touch, solely to sell more cars. Then I found this article that talks exactly about just that.
https://www.thedrive.com/porsche/11012/nurburgring-times-dont-matter
I don’t really see Spa as being all that different. Lots of elevation, mix of high and low(er) speed corners, so fairly similar. Nordschleife has lots more corners, and is bumpier, but the big difference is the length (and number of corners). A small bobble in a single corner & you’ve blown your lap. Those bumps at the Nordschleife make it so much easier to make a mistake, and all those corners give so many more opportunities for mistakes+ any one mistake will kill your lap… So, times at Nordschleife tend to favor cars that are really fast, but reliably so (or at least have big enough pocketbooks to give them enough chances at a good lap). There are some cars that are insanely fast, but more difficult to drive absolutely at the limit. They will be very hard to set a solid laptime with… it’s also rather expensive to have the ring all to yourself to go for that perfect lap, so it’s not like you get all that many attempts at it (unless you have that nice pocketbook behind you of course)
So … I don’t think Nürburgring lap times are a great metric, but I do think they are a better metric than you’d get from lap times on a similar, but shorter, circuit. (Source: I have laptimes at Spa that I’m fairly happy with, but have yet to set a single lap at Nordschleife that I’d say is great, but Harry’s Lap Timer says I have an optimal lap to be proud of)
Sorry but I think Circuit de Spa is nothing like the Nordschleife. Spa has 20 turns over 7 km, 2 high speed sections, and 100 m of elevation change. It also has pretty decent run-offs. The Nordschleife has 150+ turns over 20 km, several high speed sections, 300 m of elevation change, and virtually no run-offs.
Spa is certainly a challenging and dangerous circuit, but the Nordschleife has earned its reputation of being the most dangerous track in the world for a reason.
The point is that the nordshliefe test how the car breaks, turns (at different speeds), speeds up, at 95% which is what most street users will do. It penalizes cars that are very hard to drive and cars that are unstable over bumps and that’s very important to uses.