I have had NO luck with RWD square setups at all. Especially BMWs. Jus tried on this M3 GTR here, and 255r / 255f = complete loss of grip. Just completely baffled by this.
As someone said it, this game is all about HANDLING F1 boring car 
255 255 tyres?
yes. Same tire widths on front and rear = square setup.
Did you by anychance set up differential too high? That can cause you tyre to spin and lose grip.
An easy tip to reduce the amount of fine tuning for RWD (especially no aero builds) is to keep the tire width ratio.
Meaning if the car has 205/225 stock and can get to 265 rear go with 245 max front even if more is available.
Some cars (both Jaguar XJ220 for example) can increase front width by a lot more than rear. They become really twitchy by doing this.
It can be solved (rather easy with aero) but I don’t remember it being this impactful in FM7.
Well yeah the rears are wider from the factory for a reason. Same width front and rear only makes sense for AWD and FWD. RWD you gonna oversteer like hell when you push the car. My irl g35 is 235/255 and it’s still a bit tail happy even with its 50/50 weight distribution.
You increase front grip and you throw the grip balance off. Unless you have another way of increasing rear grip proportionally then of course your fronts are gonna pull you around and the rears are gonna slide trying to keep up. You can try doing like 1.5 degrees of toe in on the rear, tighten the front sway and loosen the rear, and raise the rear end higher than the front and loosen the rear springs and bump damping, and add rear downforce but that’ll only help on high speed curves. Otherwise with RWD you always want the rear tires wider than front. It is a balance though because you can induce a lot of understeer if the rears are too much wider than the front.
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Eh, plenty of E92 track setups running 285 square. There’s something else afoot here in this game keeping us from doing so. I will get to the bottom of it.