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2002 C230 coupe
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Discussion Starter #1
Hey, I need to noe the diameter of SC pulley on my c-coupe and how many ripets there are? Can anyone help me.......
 

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C230K Sport Sedan
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5,368 Posts
It's about 3", doesn't really matter unless you want to make it bigger and reduce boost....

It's about 3", doesn't really matter unless you want to make it bigger and reduce boost. You can't easily make it smaller because the nose cone of the s/c sticks out into the back of the pulley. You can machine off some of the metal on the cone though. Also it's pressed on the shaft so you better know what you are doing to remove it and put it back on securely and lined up. Also, to make things more interesting, MB will not sell you that pulley without a whole new S/C and wholesale it's about $1,800. Hence the reason every tuner made a larger crank pulley than a smaller s/c pulley. But please, let us know what happens, sounds like an exciting project.
 

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every 1/10 of an inch in smaller diameter pulley should increase about pound of boost. ...

every 1/10 of an inch in smaller diameter pulley should increase about pound of boost. just remember you also need get shorter belt to have proper tension. you'll need 1/4 in shorter belt for every 1/10 of an inch.
 

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C230K Sport Sedan
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Don't even think you need a smaller belt. DSR makes a smaller S/C pulley for the older C...

Don't even think you need a smaller belt. DSR makes a smaller S/C pulley for the older C230K and they kept the same belt. You would need to make it about 17% smaller to be comperable to the tuner crank pullies and get about 4 PSI more boost.
 
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