A few more corrections...
Low profile tires still have sidewalls, and they still flex. Camber actually serves two purposes, mainly is contact patch, the other is camber thrust. Both rely on a tire being a flexible body.
Model car? Strut suspensions? Neither of these have much to do with nearly any suspension geometry on a modern sports cars. Most gain negative camber under compression which is why automotive technology has moved on from simple strut suspensions like in the video you posted.
You keep saying cars need camber, while a gross generalization, it's somewhat true. But just because the GT6 setup screen says zero, it doesn't mean the cars are modeled with no dynamic camber. It also doesn't necessarily mean the cars don't have static negative camber, the setup numbers could be values relative to a default static camber number, we have no way of knowing for sure without a camber channel in the data logger.
Since we don't know what the dynamic camber is, running -2 in GT6 might mean that under load in the banking, the real camber value could be +2,-1,-6, who knows. If it's more than -4 or so dynamically, that could easily be way beyond optimal for street tires on a steep banking, that's why it's not a definitive test.
We don't know what the actual camber is of the car in the game, we don't have that data, we can't see it. What we have is what we can play with in set up, and they do not work in the ways it needs in real world. So far the only time I play with intentionally added camber is in drifting, I add it to the front since it actually KILLS front grip and makes it easier to not over correct the car.
I use that track because IIRC circa 1.05 or something in a casual league race in the exact car that I used, before I realized camber is not working in the game, that whatever setup I put it, more camber, less camber, different balance F/R...etc I am consistently several km/h slower through the ring and several seconds slower, then if I throw a completely stock suspension on the car. I tried playing with different variable, separately, stiffer/softer spring, stiffer/softer bar, damper tuning, toe...etc Nothing has nearly as dramatic effect as simply removing the camber off the car and I go faster, everywhere. The setup between the 2 runs in those shots are identical, barring camber, rear I use the loop is because it simply is the longest, steady state corner in the game that you can glean some data off of. You can look at the same type of comparison anywhere on that lap and it'll show the same thing. I know I am dialing is more steering and the car is just generally less responsive, regardless if its banked corner or not.
Put it this way, if the indicated "0" camber on the game is whatever the optimum preset "unknown" setting, why bother letting us change it then? I know in other game I tweak the balance of some car that I can make it more pointable on turn in and I dial in rear camber to settle the car down in steady state. Option like that simply is not available in GT6 for me at the moment...
Also feel free to you know, try a different test. Pick a track you think will be more representative, find your optimum camber setup and then run back to back testing with and without it and see whats faster. All this tool is available to you as is to me.
Also, Strut is not applicable to modern suspension? since when? Did all the 3 series or 911 went to double wishbone all around now?
And it happened around February I think, do not remember which GT6 "version" it was.
