Hello folks ,just did egr full deletes ,thorttle value delete today,H&S mini max and five inch flo pro turbo back last week on 2011 laramie cc lb G56.Love the extra power and the better fuel mileage.turbo started whistling more and sounds like rubbing on some thing when pushing her hard .Been reading all the posts and like them all,any help on what my turbo,its got me thinking

 

Mine did the dame thing.... From what I gathered from reading thorugh the forums, it is just valve noise and its perfectly normal on a deleted truck....


Since I deleted mine, it has sounded like I have an exhaust leak, but i gueee that is normal too...

 

Well,i took the air filter out and check the turbo to make sure it was'nt rubbing on the inside of the housing and all looked good ,going to town today so i;ll she how it goe's today.hope it is all normal,thanks

 

Check the rear blanking plate hold down studs. When we did the G56 truck my son tightened them down but one of the studs wasn't in far enough and the nut was thread bound, it was very close but the plate lifted on one side when underpressure. All it took was a washer and it was good to go.

 

Ok I will check it.... sounds like that might be what is happening to mine too

 

If you remove the plate you will clearly see if it has been leaking.

 

ok i'll check that,from 2500 to 3000rpm's makes lots of squelling and noise and after 3000 rpms disappears like it was'nt there

 

Yep,thats what it was, the nuts on the plate were only finger tight ,tightened them up and better then knewlittle fault like that can really scare the heck out of me,thanks.

 

I also had a problem with that rear plate. Thought it was down but there was this screeching noise from the Ebrake and I was told to look for an exhaust leak around the turbo. When we got back under the hood, I could see soot all around the plate. A lock washer and a flat washer made it thight and all is good!

 

Good to hear it was a simple fix.

 

what are you guys referring to when you say the rear plate. I cant picture what you are talking about. i put a 4' down pipe and only messed with the vband clamp.

 

when you take the intercooler off ,you have too plug the hole with a plate. on the engine at the rear fire wall

 

That should be the EGR cooler, not intercooler. The one that covers the exhaust manifold hole closest to the tranny end.

 

Yes ,i new what i ment and i thought later what i wrote thanks ,thanks

 

Funny enough, im getting something similar now. Almost like a pop off valve at around 30 psi of boost.

First thing I check was the plates. No dice. No leaks.

Been trying to hunt it up for a while. Seems to be on the exhaust side of things, but just cant pin point it.

Not really concerned with it though. As the head is gonna be off the thing in a couple of weeks anyway.

Good info to pass along though.