I just finished the turbo install the other day, and the car has ran great for the past 2 days. Then, I started hearing a faint whining noise and the car still boosted, then it just kep coming on stronger. Now the car will not go into boost maybe 1 psi at times, and when the vacume drops and gets close to boost its just a extremely loud whining noise. The car still runs fine, but just will not boost and makes that loud ass noise when getting close to it. The turbo sounds fine spooling when Im just crusing and barely into the throttle. Now heres a few thoughts...

Oiling is fine, no smoke and not leaking at all.

I thought the wastegate extension off the manifold was leaking so I pulled it and rewelded it but still the same, and I couldnt find any manifold cracks.

The wastegate is a tial 38mm with tial 7.3 small green spring, could it be sticking? but then what would the noise be?

I realy think its the turbo but I dont know what happened. Its a new turbonetics t3 super 60 .60/.48, and if it went bad what is most possible caused it? Would it make a noise like that?

I am using a tial 50mm bov which I think the spring is rated for like 2psi off of what my idle is, could this have anything to do with it? I also heard that smaller turbos dont like the tial bov, if this is a problem how is the super 60 with it?

I did cut a groove in my phenolic intake spacer from the pcv port in the head to one of the cylinders, thoughts on this with boost?

Ive checked all the charge piping and all is fine, and vacume is right where it should be so I dont see any leaks.

What the hell happened? I think its the turbo but wouldnt it still boost at all if a bearing went bad or something? Like said all oiling seems fine, no smoking or anything from the turbo either.

I

rip your compessor charge pipe off and try and wiggle and spin your shaft and hit me back sounds like your bearings are fried.


"Kick azz is my boost hero!!! "

Dont you mean intake? I cant realy spin the shaft through the compressor outlet

What the hell could have caused that? As said the oiling system is fine, its a standard bearing turbo.

Ill have to wait until the morning to check how it spins and the shaft play. I have a new set of bearings I could put in if need be, but what the hell would wear them out that fast? I dont realy see how, but could venting that pcv port to a manifold port be hurting something in the oil system?

Anyone else have any input?? I need help!!!!

this same thing just happened to my brother on his talon. he installed a new Evo 18G, and used teflon tape on the oil feed. a small peice of the tape got into the bearing, and seized it. the thing is shot, shaft wiggles all over the place now. sounds like the same thing here.



M90'd Built LGO-15 PSI
http://webstarts.com/quadper4mance

sounds to me like your turbo met the same fate as mine did....

Acording to the guys in this thread....

http://www.j-body.org/forums/read.php?f=40&i=157481&t=157481

I bet it has ALOT to do with your plumbing the PCV port into a positively charged intake port.

Sweetness went thru 2 turbos due to a blocked PCV port... I think mine died due to my pcv being vented to my positively charged TB.

It sounds like building positive crankcase pressure does not allow the gravity return to drain the oil from the turbo...

I will be pulling my turbo off tomorrow to see the damage.... i will report back.

but i am willing to bet your turbos fate is in the hands of that grove you cut.

Ima pull the turbo tomorow and check it out. if a bearing goes bad it wont boost at all?


and i just cant realy understand the hole pcv system thing. the stock intake mani has grooves that run from the pcv port to each runner and many people have boosted on the stock mani. should i fill the groove i cut or no?

Take intake/air filter off, grab nut on the compressor wheel, if there is a ton of movement start saving because you need a new turbo. Sounds like the same thing that happened to me. Jakelegend can tell ya all about that...



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4 Cams...32 Valves...5 Liters...This Could Get Fun!

icemike89 wrote:Ima pull the turbo tomorow and check it out. if a bearing goes bad it wont boost at all?


and i just cant realy understand the hole pcv system thing. the stock intake mani has grooves that run from the pcv port to each runner and many people have boosted on the stock mani. should i fill the groove i cut or no?

I never understood PCV either... but just recently "got it"

PCV "positive crankcase ventilation" is the process of eliminating pressure from building up on the wrong side of the pistons. If you want the most power you want all the pressure on the top if the piston, and as little pressure as possible under them. Well due to engines not being perfect, you will always get some pressure leaking past the rings to the crankcase (blowby). PCV was designed to allow the pressure built in the crankcase to vent itself. (and in most cases, to actually have it sucked out by a vacuum source)

In the case of aftermarket turbo's and blowers, most of the places that used to be vacuums now fluctuate between vacuum and boost. In the case of turbos. this can be a doubly bad thing. first of all, you are loosing power because your "boosting" both sides of your piston... and piston movement is driven by pressures trying to equalize themself. so the less pressure differential, the less you piston tries to equal them out. More importantly than that.....

The drain line on most turbo'ed LD9's runs into a bung on the side of the oil pan. (This i am learning is not really the best place, as even putting it as high on the pan as you can get it, it is usually below the oil level, i found this out one time i pulled my return off with my car off, and got oil pouring out all over me.) So this is not the best approach to begin with, and then the fact you have to bend your line around the CV shaft as well... usually makes for a less than ideal drain line. For a gravity fed return, you want as straight, as short, and as verticle a drain line as you can get... well we strike out on all 3 of those.

But then you add positive pressure to the crankcase, and now the oil already wants to "leave the engine". So your less than ideal gravity return now becomes almost "corked" by the presurized oil it is submerged under. You SHOULD still get some flow, as i would hope the oil pressure is greater than the crankcase pressure, but as has been proven on several of our cars... this isn't enough flow to keep a turbo healthy.

So if the bearings are shot and there is alot of shaft play, theres no way to rebuild it? I actualy have new bearings/seals, and can get the shaft balanced for cheap. Just dont have the money to shell out for a new turbo right now, well atleast what Id like to get lol.

I just want to keep this from happening again. I guess Im gona seal off the pcv groove and hope nothing got sucked down into the turbo. Ill only use teflon paste from now on lol, no more tape.

Thanks for the help guys. Ill post up later with what I find going on with the turbo.

Never use teflon tape on fuel or oil fittings. Teflon paste is what you want.

Never use gasket sealer on your oil return and its gasket. You think gasket sealer is made for 1500-1600 degrees?

Mike, I tried to tell you nicely to quickly undo that PCV hole. While I know it goes against what has been done conventionally, you'll see that even GM went to the effort with the GMSC to block off the PCV hole from the runners on the S/C and then run a line PRE SUPERCHARGER so that it has vaccum.

The last thing you want in you PCV is boost. Punch this into google "PCV + BOOST" and see what comes up.

As stated, remove the turbo intake, and check the wheel for play. Also make sure that the wastegate isn't stuck open, and check your BOV. You could easily be venting all your boost.

-Chris-



-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...