I'm getting a weird stutter sound during accel and decel to/from high rpms. It's coming from the area of the dbb turbo, but when I removed intake pipe to check turbo, it spun fine and was tight with no shaft play or scraping of any kind!:

http://www.youtube.com/watch?v=cT14ak89-O0

 

uh... is your bov working? sounds like compressor surge

 

it can be heard more clearly in this video:

http://www.youtube.com/watch?v=F4HrcwHZWww


Is this what is called wastegate shutter?

 

Thats compressor surge..... lol.... some of you guys just kill me. Most basic of stuff......Aren't you a mod at NA-T dejackey?

 

r u basing ur conclusion off the first or second video?

 

First video=compression surge, I have no doubt, I hear nothing in the second video except something that sounds loose down on the firewall. FWIW I have never heard anything called wastegate chatter either.....Compressor surge is where under decel your BOV isn't venting 100% of the pressure that it should so it has to escape back through the compressor wheel.

 

Yes, that rattling sound in the second video is what I've been referring to, but thanks for your insight

 

Under heavy decel there is alot of stress on the whole motor, including manifold, turbo, dp, etc. Check and see if something is loose either in your engine bay close to your d/p by your firewall, or down by your AEM inside the cab. What kind of BOV you running?

 

Could be your IC piping touching the chasis somewhere as well. Took me a day to find that noise and eliminate it. lol.