Well I have blown my T76. Anyone have an idea as to what might have caused this. I went out to log a few runs, before going to the dyno, and after the 2nd run I was engulfed in a huge cloud of smoke, at first I thought I nipped a piston, but turnes out it was the turbo. I was running 15~17PSI, with 11.5AFR. Good oil flow, and drain back seems to be good. So this must have been caused by overspeed, or egt. The exhaughst side is completly burnt, but the intake side looks ok. The turbo is a Turbonetics T76 .96AR journal bearing that has less than 500miles on it. I bought the turbo new last year for another project. It did not come in my trick kit so there is no warranty.

 

looks like there might be a scrape on the wall of where the impeller is.. is it loose?

 

Yes, really loose. The whole thing is fried. Just trying to find the cause.

 

That's a tough one. You shouldn't be over-speeding that turbo on a 6l, it's a pretty big compressor. High EGT's usually eat the turbine wheel, cuz it get the blades so hot that they loose there structural integrity and the centrifugal forces blow the tips of the blades off. Just looks like you had bearing failure. But that doesn't make too much since since you should have had adequate oil flow. Hummm... might have to chalk this up to a random failure. Are you gonna have it repaired or gonna get a new one? It you want a new one, PM me I know a guy who can hook you up on a Precision.

 

I hear you on the high egt's torching the wheel. I burned up several on my old Dmax. On this deal the wheel looks ok. How much tuffer is a Ball bearing turbo? The reason I think the turbo speed is an isue is 15-16PSI is all that turbo will make up hear. Im running a 14LB spring, and the boost controller is all the way up. I tried pulling the hose off the waste gate, and get no more boost. When I drove the truck down to pueblo, 4700' boost hit 18-19psi and I had to turn it down.

 

Sure you let the truck warm up before you flogged it??? I know how cold its been and it takes a good 15-20 minutes to get to operating temps.

 

Honestly it wasn't super warm ect was in the 150's. I had driven it 5 minutes max. The truck had only been sitting an hour or so though.

 

ImageShack sucks.

 

Can you see the pictures?

 

Just looks like a failure. There was no intercooler pipes off that might of overspun the turbo? Another thought is maybe the truck was shut off before the turbo cooled before,that can hurt the bearings if you beat it bad then shut it off without cooling but I wouldn't expect for it to die so quickly..