Quote:
Originally Posted by M3 Adjuster
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. |
Thanks I wasn't aware of this.
So in some ways it's like an antilag device.
If the wastegate is held closed, then you should be able to build boost while getting ready to launch the car. Should be easy enough to see if you have a boost gauge.