SL55 AMG, SL63 AMG, SL65 AMG (R230) 2002 - 2011 (2003 US for SL55 and 2004 for the SL65)

SL55/63/65/R230 AMG: SL55 whine on start up

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Old 10-11-2009, 02:36 PM
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95 E320 Cab (new toy), 06 Range Rover (Hers), 97 Ferrari F355, 05 Ariel Atom 2 (the other toy)
SL55 whine on start up

Does anyone know what the whining sound is when you start up the car, especially when it is cold? It sounds kinda like a belt whine but not so high pitched. It goes away when it warms up, but every now and then I hear it when I gas it.

Also, is there a wastegate/pressure release valve that releases when starting to move slowly?

This is a new to me 05 SL55 w/ 53,xxxK miles.
Old 10-11-2009, 04:24 PM
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2003 SL55 AMG
My guess would be some combo of the supercharger and the AIR pump.
Old 10-11-2009, 04:35 PM
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06 C55, 09 E350
yep that would be the air pump perfectly annoying normal sound.
Old 10-11-2009, 05:44 PM
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95 E320 Cab (new toy), 06 Range Rover (Hers), 97 Ferrari F355, 05 Ariel Atom 2 (the other toy)
Thanks. I kinda figured it was. It's always nice to hear it from someone else.

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