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

SL55/63/65/R230 AMG: S/C clutch engagement

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Old May 11, 2016 | 12:52 AM
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2006 E55, 2006 SL55, 2006 LS7 Ute
S/C clutch engagement

Sorry but I did do a search. What variables, rpm, TP, or? are measured by the ECU to engage the S/C pulley? At what rpm is it engaged? Does it ever run only partially engaged? Why is it needed? So many S/C'd vehicles out there with clutch less S/chargers. Cheers.
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Old May 11, 2016 | 10:35 AM
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Originally Posted by trabots
Sorry but I did do a search. What variables, rpm, TP, or? are measured by the ECU to engage the S/C pulley? At what rpm is it engaged? Does it ever run only partially engaged? Why is it needed? So many S/C'd vehicles out there with clutch less S/chargers. Cheers.
This info page from the Mercedes ETM should answer most of your questions.

Cheers,
Chris
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Old May 11, 2016 | 03:03 PM
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To fill in the blanks...the SC is on or off, never partially engaged; it is off at low load so it does not cause drag during normal situations, saving gas and wear on equipment; it is needed to produce forced air induction into the cylinders, making magical horsepower appear for big grins.
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Old May 11, 2016 | 07:08 PM
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Query answered, Thanks for that.
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