Quote:
Originally Posted by Smiley1175
On the 1M it's just a throttle mapping which changes. Doesn't give any more power. You can feel this when going WOT. Playing with the button will make zip difference.
Hold part throttle and press the button and you'll feel a surge, just as if you'd stabbed the accelerator, ie it just gives more throttle for same pedal travel.
Sadly it doesn't really do much else and not something I use all that much at all on a daily basis.
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the OP is correct. The wastegate is held closed. How do I know? Because a BMW M engineer told me in 2011.
IN person, face to face, and yes, I am serious.
Also note the phrasing.. " When even more power is demanded, it is immediately available ". This does NOT mean that the car has more power when the M button is on.... it only indicates that the boost is more immediately available so the power comes in SOONER than if the button were not switched on.