What is this slapping sound?

[Inthehighdesert]

If you didn’t, this is a very good idea. If you did and I missed it, my apologies.

http://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&products_id=1011

It's the bolt that holds the crank pulley to the crank shaft. It is vibrating loose while driving, most especially if I go past 3500rpm and enter boost. It needs to be tightened down after every drive or it keeps getting worse.

Maybe try a different bolt? I'm not sure what the shop put in there as I was on 7/12s for 3 months and couldn't do the install myself.

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