There is a vacuum port on the rear of the upper intake manifold. Where does the line go to from it? I took my turbo power cover off and noticed the port there and no line coming off of it. Also what is the thing that looks like a tuna can on the passenger side valve cover? There is a bunch of oil around it on the valve cover.Thanks

Tuna can = CDR. CDR = Crankcase Depression Regulator - Similar to a PCV valve on a gasser. It regulates the amount of vacuum in the engine crankcase to prevent oil leaks

The "vacuum port" isn't stock. Was probably hooked to a boost gauge from previous owner. Can you post a picture? :cool:

What is CDR? It appears to be stock. Give me a ouple of minutes and I'll post a picture.

CDR Valve, as mudbath explained, is similar to a PCV valve on a gasser.

Here is a little info on the CDR http://www.dieselplace.com/forum/showthread.php?t=11637. Please take a few minutes and read over that :).

http://i99.photobucket.com/albums/l301/h2omelon89/suburban/003.jpg
http://i99.photobucket.com/albums/l301/h2omelon89/suburban/002.jpg
http://i99.photobucket.com/albums/l301/h2omelon89/suburban/004.jpg
http://i99.photobucket.com/albums/l301/h2omelon89/suburban/001.jpg

not a vac port. That's for a boost gauge. whoever owned the truck before you must have had at least a boost gauge in the truck. hook one up there as you've already got the spot drilled and tapped.

Diesel's don't make manifold vacuum like a gasser as there's no throttle plate to restrict the airflow in the intake.

Is the oil on the cdr normal? My turbo is extremely loud and bosst comes up almost instantly. I am wondering what all mods have been done to this truck. The downpipe appears to be aftermarket also. Can anyone tell from this pic?
http://i99.photobucket.com/albums/l301/h2omelon89/suburban/007.jpg

Is the oil on the cdr normal? My turbo is extremely loud and bosst comes up almost instantly. I am wondering what all mods have been done to this truck. The downpipe appears to be aftermarket also. Can anyone tell from this pic?

Its a mandrel bent downpipe it looks like. That would be aftermarket. If you saw the stock ones you'd see why we upgrade them. The turbo's on these trucks are designed for quick boost off idle, but they fall on their face due to backpressure and inefficiency higher up in the RPM range.

The pipe is smooth with no kinks all the way down and is 3" in diameter. That's cool if it is aftermarket one less thing for me to have to buy. Is it normal for the turbo to be so loud ? It sounds good but after reading some posts on here it seems like I shouldn't hear it at all. I sometimes get code P0238 High boost.

How is the turbo wastegate controlled? stock vac system(little black plastic hose attached to the turbo) or T/M(whether heath made or home-made). A T/M is basically a spring on a rod that holds the wastegate shut until the turbine drive pressure overcomes the spring tension.

It has a vacuum line on it.

Follow the line it probably goes into the cab of the truck to where a boost gauge used to be. PO probably took it off before selling truck. Make sure to plug it until you get a boost gauge hooked to it. :cool:

http://i99.photobucket.com/albums/l301/h2omelon89/suburban/064.jpg

That would be the actuator to your wastegate. :cool: I thought you meant the "vacuum line" on the back of the upper intake. It should be plugged. The one in the picture would go over to a vacuum solenoid beside intake on driver's side. And then vacuum to the solenoid comes from the vacuum pump driven by the fan belt.

Will a vacuum line cap be enough to plug the port on the intake? Sorry for the 20 questions.

Might need a clamp as there is boost pressure there, (still talking the one on the intake) PO might have just put a plug at one time which blew off first time it got to 10 lbs boost. :cool: The one going to the actuator must have line going to it as this control the wastegate which gives boost.

The one going to the actuator is hooked up. I just posted a pic because I was asked how it was controlled vacuum or turbo master.

The one going to the actuator is hooked up. I just posted a pic because I was asked how it was controlled vacuum or turbo master.


Cool

:)Thanks for all the help guys.

:)Thanks for all the help guys.


That's what we are all here for. :D

As for the line on the intake, hook up a boost gauge to it.

As for the audible level of your turbo, does the truck have an aftermarket exhaust or intake on it. The turbine(exhaust) side of these turbo's whistles pretty good. Your truck already should have the round air filter setup, which is the best form of CAI out there right now unless you build your own from scratch.

It has the stock air intake. I crawled under the truck a few minutes ago and it has an aftermarket down pipe and a 3" pipe from the down pipe to the cat. After that it appears to be a stock muffler and pipe.

It has the stock air intake. I crawled under the truck a few minutes ago and it has an aftermarket down pipe and a 3" pipe from the down pipe to the cat. After that it appears to be a stock muffler and pipe.

Interesting. If you really want it to sound good, misplace the kitty and remove the muffler. It'll be loud, but i say that like its a bad thing. :p:

Heres a clip of the sound
http://i99.photobucket.com/albums/l301/h2omelon89/suburban/th_ASF_0002.jpg (http://s99.photobucket.com/albums/l301/h2omelon89/suburban/?action=view&current=ASF_0002.flv)

Heres a clip of the sound
http://i99.photobucket.com/albums/l301/h2omelon89/suburban/th_ASF_0002.jpg (http://s99.photobucket.com/albums/l301/h2omelon89/suburban/?action=view&current=ASF_0002.flv)

Maybe I'm nuts, but that doesn't sound at all like a GM-X turbo whine to me, other than when letting off. Sounds more like a worn bearing or bushing on something to me.

Maybe I'm nuts, but that doesn't sound at all like a GM-X turbo whine to me, other than when letting off. Sounds more like a worn bearing or bushing on something to me.
If that is before you plugged that boost tap, it could be coming from that... but thats just what it sounds like it "could" be.

That was after I plugged it but the plug could've blown off I haven't checked it yet.

If that is before you plugged that boost tap, it could be coming from that... but thats just what it sounds like it "could" be.

Good point. I didn't think about that.

The plug is still on. What else could it be?

bad bearing in an accessory pulley, or the tensioner pulley. My subaru beater has that same squeal like sound above 3K rpms, and i know its got bad pulley bearings somewheres, i just don't care about that car. :p:

I can be riding along and goose it and it will make that noise also. I've never had a pulley make that noise before. It will not do it in neatral just revving the engine only when under a load.

Did the the high idle mod today and was able to stand outside the truck and listen. The whistle is actually coming out of the exhaust pipe. Evidently my cat has been gutted so you can really here the turbo spooling up. By the way the high idle mod is cool as hell.

That thing sure sounds sweet tho. Makes way too much noise (scratch that, a "noise" would be annoying, "sound" is more like it in this case :D) to have a factory exhaust. The muffler may look stock but i'm betting it isnt!

It's always fun to get on it a little when going by F250/F350's and 2500/3500 dodges and seeing their faces when they look over and see a suburban.

In the last pic above I can just see the black vac line to the WG actuator. Something fishy about getting overboost with the vac system. Need better pic to confirm setup.