Exhaust note at startup vs warmed up
Thread Starter
MBWorld Fanatic!
Joined: Jun 2002
Posts: 1,249
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From: Chicagoland, IL
09 C63
Exhaust note at startup vs warmed up
So what's changing in the guts of the car to cause the absolutely insane roar at startup and initial idle versus when it warms up?
Is there some sort of valve in the exhaust that gets flipped? Can it be blocked from flipping? The sound when I first get in is amazing! still amazing after, just quieter.
Cheers all.
Is there some sort of valve in the exhaust that gets flipped? Can it be blocked from flipping? The sound when I first get in is amazing! still amazing after, just quieter.
Cheers all.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 4,563
Likes: 42
C63 AMG
I believe that would be caused by the engine retarding designed to allow more surface area of the cylinder wall to be exposed to flame and warm up quicker.
This would cause more gases to be released into the exhaust system.
This would cause more gases to be released into the exhaust system.
Super Member
Joined: Nov 2007
Posts: 655
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I drive the racism out of BadDebt. ;)
So what's changing in the guts of the car to cause the absolutely insane roar at startup and initial idle versus when it warms up?
Is there some sort of valve in the exhaust that gets flipped? Can it be blocked from flipping? The sound when I first get in is amazing! still amazing after, just quieter.
Cheers all.
Is there some sort of valve in the exhaust that gets flipped? Can it be blocked from flipping? The sound when I first get in is amazing! still amazing after, just quieter.
Cheers all.
delete your resonators and you will have the roar all the time.
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Senior Member
Joined: Jul 2008
Posts: 305
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From: Scottsdale, AZ & Bend, OR
2009 C63 AMG
There are primary catylitic converters and secondary ones. I removed secondary ones, removed the resonator box (there is just one), and replaced the resonator box with an X-Pipe.
The car sounds nice and tame under 1,500 rpms, but at initial start-up and high rev's is VERY AGGRESSIVE...
The car sounds nice and tame under 1,500 rpms, but at initial start-up and high rev's is VERY AGGRESSIVE...
