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Old 06-13-2015, 05:58 PM   #3433
Scracho
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Join Date: Jun 2014
Drives: 2018 Subaru BRZ
Location: Ancaster, Ont. Canada
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Quote:
Originally Posted by pgranberg11 View Post
yea, I get the chatter. When starting to accelerate from a dead stop it sounds like something it hitting something else under the engine. I realized it's actually belt slap. If you're hearing chatter my guess is the belt is too loose. The tighter I put the belt on the less chatter I heard. So I just tightened the belt to where I heard no chatter. The 21mm rule that they have in the manual didn't work for my second belt. It was wayyy too loose. I went by my friends "half a belt twist rule" and it worked fine. Just tightened a tad bit more and then all chatter disappeared. If I could remember, I believe I'm at 14 or 15mm from the bottom of the bolt head tensioner to the supercharger bracket. Hopefully this helps a few.
Same here...

Used the 21mm rule and was way too loose. I have adjusted it several times tightening each time and chatter would go away then belt would stretch and slightly comes back. Now I'm at 16.144mm, using half twist rule and chatter is gone, and weird swirling noise from charger at idle gone too.
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