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Old 02-09-2013, 11:24 PM   #5
jtrakel
Scooby Specialist
 
Member#: 242647
Join Date: Mar 2010
Chapter/Region: NWIC
Location: Lacey, WA
Vehicle:
04
PSM

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Quote:
Originally Posted by kapp_badbloodz View Post
Sounds like piston slap.

Have you driven it around yet? I figured out after making an ass out of myself asking a bunch of noob questions that a built motor with quality forged components takes more time than your average cast parts.

Drive it around (if you can) and put some load on the engine. One its at a normal operating temp then see if the noise persists.

Don't bust your car's ass if you don't have a stable break in tune!!!!
My break in tune is about as stable as it will get I'm not worried about the tune. My car is totally drivable just a mysterious noise which I believe to be piston slap as well.

Quote:
Originally Posted by _OneFastSTI_ View Post
Piston slap. Go drive the thing. Don't worry about it. Mine sounds the exact same.
Sweet thanks She's been ridden hard and putting away wet a few times already! But in all seriousness I'm doing a mixture between a hard and soft break in. The motor see's it's fair share of positive boost.

Quote:
Originally Posted by kapp_badbloodz View Post
Check for boost/exhaust leaks. My car is running like doo doo because of that too. Those electronic pipes that let you open up your exhaust at the down pipe or whatever they do (make your car louder) leak really bad. Also, if you have a VTA type BOV ditch it and go full recirculating.

EDIT: I didn't want to post this since you already have rails/fpr but my 2008 has the dreaded stumble issue. Have your tuner dial in your rails/fpr or add 3' of fuel line after the OEM fpr to remedy the fueling issue.

These are some of the issues I've had so I'd rather pass it off for gee wiz info over you guessing if you come across it. You got a nice build going though. How do you like the flipped manifold? Pics?
Defiantly not a boost leak or exhaust leak. All of my waste gate lines etc. are all AN fittings and my exhaust cut-out is currently not welded into the down pipe since I've changed my piping to V-band connections. Also no issues with fueling all my pressures are solid on booth feed and return. No need to extend or shorten and lines. I do not run a BOV at all and if I did it would not really matter since I'm tuned on speed density (compressor surge FTW!) Thanks for the info though I'm chalking it up to piston slap right now. And I do enjoy my rotated manifold it took some work and $$ but it's worth it to me. Looks better IMO

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