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Do you have any idea what said effect would be?
The tyres that are still on the ground would get a vast increase in downward pressure which also equals a vast increase in grip. Massive amount more grip on a car already on 2 wheels with a high centre of gravity plus lots of turning angle = roll.
If you know what you're doing, it's very easy to avoid it happening in FM4 regardless of your suspension setup. (obviously excluding roll over tunes)
Watch the op video then the real video. Notice the difference? In Forza the car lifting has no effect of the direction of the car as if the tires are super glued to the track which helps it to flip. In the live video notice the rear end shifts toward the outside as the car is being lifted which turns the car more inward. The driver has to chase the rear end by turning toward the skid or the car would have flipped.