E55K Fixed or Clutched S/c Pulley

Discussion in 'Performance Lounge' started by merc85, Aug 10, 2017.

  1. merc85

    merc85 MB Club Veteran

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    Whats the pro's and cons of a Fixed S/c Pulley over a clutched one?

    Just asking:D
     
  2. Alps

    Alps MB Club Veteran

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    clutched everytime, you will get overheating issues with a fixed pulley.

    many people in the US have swapped back to clutched.
     
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  3. AngryDog

    AngryDog Hardcore MB Enthusiast

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    I believe that there have also been mapping issues as well with them.
     
  4. OP
    OP
    merc85

    merc85 MB Club Veteran

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    Cheers peeps always worth a ask before doing anything , much apreciated ;)
     
  5. AMGeed

    AMGeed MB Club Veteran

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    ^ Somebody wants the 77mm pulley:D
     
  6. OP
    OP
    merc85

    merc85 MB Club Veteran

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  7. SMed08

    SMed08 Hardcore MB Enthusiast

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    Been looking back and forth for a while, from what I've read:

    Pros:
    -Changes driving dynamics for the better, boost always on instantly. People seem to love them now.
    -Much smoother, no jerky clutch engagement
    -Cheaper as it's much simpler, no need to worry about clutches and bearings etc.

    Cons:
    -Baseline IATs run about 10-12°F higher at best. Really need max cooling already sorted if you want this to work.
    -MPG goes down a couple of points
    -Supercharger theoretically will wear out faster
    -No actual power or performance benefit



    I think there used to be a tuning hiccup issue when these first came out, but nowadays I'm fairly sure it's sorted. Everyone that has them seem to use RaceIQ, they come highly recommended and the hiccup seems to be gone.
     

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