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COLD START - EXHAUST NOTE

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Old Dec 11, 2010 | 01:06 PM
  #26  
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1999 C43, 2008 P30 E63, 2014 SQ5, 2024 Model Y Performance
Originally Posted by LZH
Jim - so CLEARLY something is functioning differently during cold start up...do you know what it is ??? I mean, during cold start at 1000 rpms the exhaust note is amazing. Then when the idle lowers and I use the gas pedal to maintain 1000rpms, the sound is mundane and crappy - SO WHAT GIVES>>?? Sounds to me like the mufflers have a butterfly valve but I've never really looked at them very closely...wonder if there is a air line (vacuum line) going into the muffler??
I wish my C43 sounded as mundane and crappy as your BS
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Old Dec 12, 2010 | 12:47 AM
  #27  
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LZH
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CLK 63 Black Series, 2009 S550, 2011 Range Rover Supercharged, BMW F800 GS Anniv Edition
Lol! They're pretty cheap now and only going to become more rare. Spring for one !
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Old Dec 28, 2010 | 04:21 AM
  #28  
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Pinto
COLD START + RICH FUEL MIX + EXTRA AIR FROM SECONDARY AIR INJECTION = CAUSE THE EXHAUST NOTE TO SOUND LIKE THAT
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