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      12-20-2019, 06:22 PM   #184
Former BMWCCA/NASA AZ HPDE Instructor
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Drives: 2018 M3 CS
Join Date: Jan 2014
Location: Phoenix, AZ

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Originally Posted by spool twice View Post
It may be pure luck each time, but I'm learning how to always get a big start-up roar and crackles on the CS during a warm-start situation:

-press the accelerator pedal past kick down after the ignition is "ON" for a second and release

-then just start the car as usual

no need to fiddle with the drive modes as you can just keep it in efficiency, the roar will be louder and will have crackles vs the normal CS start-up roar during a warm start. The same "trick" works on cold starts too.

It sounds almost as if the flaps open momentarily, but then it'll settle back down in the normal efficiency mode exhaust noise after it clears it throat.
I think you posted this on the wrong thread.

Retired BMW CCA/NASA HPDE Instructor
Now, just a guy who knows a little bit about a lot of stuff

2018 M3 CS
2020 Z4 M40