So a few months back I put 3 inch plenums on and had to pull the turbo to do so, so with the turbo off did the evap delete and gutted the flap out and all that good stuff. I also put in a set of stage II injectors. When I had the turbo off it was in perfect shape no up and down play or in and out. I put everything back together and I have been driving it for a few months now with no problems it is whole new truck with those IIs, the other night I have an empty stretch of road in front of me after making a U turn so I laid into it in the hot tune and right about 30 psi I here what I thought was an intercooler tube blowing off but I could tell it just wasn't right. Tons of blue/white smoke might have been a clue lol. Anyhow the turbine sheered off the shaft and put a nice dent/crack in my down pipe. My first thought was that OK the IIs finally took their toll but then after pulling the turbo and seeing all the damage it makes me think something came trough to make it do that. I pulled my EGT probe and it is still intact. I looked down the Up-pipes with a bore-scope and it all looks good I don't see any shavings or what not. The truck idled fine and didn't make and abnormal noises. I drove it onto a trailer.

OK now for the question.
Sorry for the long story. I just wanted to know if anyone else has seen something like this. I will post pictures up either tonight or tomorrow but I don't see any reason for it to come apart like it did with out something going through it. Has anyone ever herd of a turbo doing this all on its own. I knew the it wouldn't like the IIs but I didn't think it would just explode. Any past experiences or info would be great. I have a used turbo on the way hopefully get it tomorrow. But it bothers me how this one just came apart like this.

Thanks
John

 

the stage 2 injectors are extremly hard on stock turbos the shaft shearing was probably because of the the pressures trying to drive a turbo that is unable to keep up with the demand it was asked to do so it just gave out

 

u can run stock turbos with stage 1 injectors but not recommended with stage 2

 

Ya I knew it would last too long with the IIs but I was thinking thrust bearing would go out and I would get some smoke and it would jsut keep getting worse. Not the turbine out the downpipe. Ill go take some pictures and post them up its scary looking haha

 

u got to keep in mind the shaft aint too big it is smaller than a pencil so it wont take much torsional forces to snap it i know i have snapped a couple trying to get the compressor nut off

 

I got to see the carnage!!

 

Here you go, Where it broke it looks bigger than a pencil.

 

looks like it just kept spinning outta the turbo all i can say is damn!

 

Ya looks pretty bad I just hope that it decided to do it all on its own.

 

most likely it did

 

John I have a couple of questions. Just curious.

Where is your probe for the pyrometer mounted?

What level of EGTs were you seeing?

 

Wow. This is the reason pulling requires two bolts crossed in the exhaust to stop that kinda shrapnel.

 

Yep, that's what pushing a turbo wayyyy out of it's map does. LOL

Here's something that I've seen on my truck for you to think about and I'm lucky this hasn't happened to me, but my thrust bearing is on it's way out.

My drive pressure @ 25psi of boost and WOT(intake plenum leaks) sits right around 68psi. That's reading off the scangauge, so that should be absolute pressure. Turbos don't like that too much and yours could have been better or worse than mine.

Pull the thrust bearing out and see if it failed. It could have failed and allowed the shaft to go crazy and with that hard WOT run it sheared the shaft. Just making guesses.

 

 

Probe is mounted right where the driver side manifold starts to bent up. I don't know what my EGTs were when it went but I have seen them spike before to around 1500-1600

I'll pull it apart and see what it looks like I've always wanted to anyhow. Speaking of intake plenums leaking, during disassemble this time I noticed a crease in one of my manifolds. I guess I tightened the clamp to tight last time. It had to be leaking but I could still see 30+ psi. makes me wonder how what I could see with a tight system. I guess its time for some inserts or to pull them off again and beef them up.