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I was watching on YouTube and did some reading on the effectiveness of a wing as function of the total weight of the car.
My apologies, but I could not find the reference out there quickly.
From at least two sources, the wing (a real wing, not the GTS spoiler) has very little effect on a 3600Lbs car. It is very helpful for a 2300Lbs - 2600Lbs race car.
While the wing will still generate the downforce, as indicated by the Wing specs, it will not generate the lap time benefits on E92 M3 that was not striped down.
It involves calculations that I am not expert on, but intuitively the G forces as proportion to mass don't help the tires grip more by adding more weight (downforce)
Sorry I can't find the links
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