As far as I can tell, it has something to do with aero. Wings, placement thereof, size, and aero inclination/downforce. rileybanks’s car DNFed a lot because it had two rear wings. I found out last season from HighOctaneLove’s submission that doesn’t work well. Daytona turned out to be a really buggy track, so I may not use it next time around. Or I’ll just post a giant warning that says “test it on that track before submitting, because that’s the one that will probably fail.”
I can give you a bit more detail on this one: There are two main circumstances in which a car would fail to test.
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The load on the tyres is too great, whether it’s due to poor quality tyre, disproportionate or inappropriate widths, etc. This gives you a tyres blown warning. I get this a lot when trying to run 2500hp+ cars.
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The lift on either half of the car exceeds the weight at either end of the car (as calculated by weight distribution over total weight), at any speed below maximum speed. That’s obviously because the cars lift off
This also gives you a tyres blown warning.
2b) The lift on either half of the car exceeds the weight at either end of the car WHILE travelling over a crest, such that the change in inclination reduces total weight because the reference point (the ground) is dropping away. So while your car may have passed the initial top speed testing, if it goes over a crest and the car gets airborne, well… as I’m so fond of linking to: flying car and more flying car. So basically if the numbers look like they’re heading that way, this is what happened to your car 
Nordschleife is troublesome for this because it has some pretty big high speed crests and drops.
Solution to this: you CAN run a double wing on the back but you must have sufficiently low lift, or better, positive downforce on the front. Beware: high downforce in one area causes lift in the other, so you’ll need to add something to the front. This is why the government doesn’t like chavs putting big fat wings on their cars 
Also, tracks with huge banking can be an issue if the car is literally too slow to make it around the banked portion of the track and may actually fall off. Overly high negative camber that also overwhelms the traction a car has will also cause a DNF.
I’m satisfied enough with my BMMS.
Thanks for hosting the challenge!
[quote=“strop”]I can give you a bit more detail on this one: There are two main circumstances in which a car would fail to test.
-
The load on the tyres is too great, whether it’s due to poor quality tyre, disproportionate or inappropriate widths, etc. This gives you a tyres blown warning. I get this a lot when trying to run 2500hp+ cars.
-
The lift on either half of the car exceeds the weight at either end of the car (as calculated by weight distribution over total weight), at any speed below maximum speed. That’s obviously because the cars lift off
This also gives you a tyres blown warning.
2b) The lift on either half of the car exceeds the weight at either end of the car WHILE travelling over a crest, such that the change in inclination reduces total weight because the reference point (the ground) is dropping away. So while your car may have passed the initial top speed testing, if it goes over a crest and the car gets airborne, well… as I’m so fond of linking to: flying car and more flying car. So basically if the numbers look like they’re heading that way, this is what happened to your car Nordschleife is troublesome for this because it has some pretty big high speed crests and drops.
Solution to this: you CAN run a double wing on the back but you must have sufficiently low lift, or better, positive downforce on the front. Beware: high downforce in one area causes lift in the other, so you’ll need to add something to the front. This is why the government doesn’t like chavs putting big fat wings on their cars
Also, tracks with huge banking can be an issue if the car is literally too slow to make it around the banked portion of the track and may actually fall off. Overly high negative camber that also overwhelms the traction a car has will also cause a DNF.[/quote]
makes sense, the car had pretty low downforce on the front and decent downforce on the rear. I can be satisfied that it flew away to a better place
(slightly off topic, but inspired by strop’s explanation)
If you like watching things fly that aren’t supposed to… HYDROPLANES! youtube.com/watch?v=ag6BgfFgikc
Just to clear things up a bit:
This shouldn’t give a tyres blown warning. The car just stops to accelerate when the wheel load is zero. If you have a car/track combination where you think this is happening, please share, I would like to see what’s happening.
Dynamic wheel load changes because of crests and compressions are not simulated in the game.
Sending you the wreckage for analysis.