When a turbo eats a rock

[erix920]

I was installing my nice new catchcan thinking that oil was filling my intake through the pcv system. In the process of cleaning out my intake I saw some oil in the inlet of the turbo so I went in and cleaned it. I wanted to check shaft play so I tried to wiggle the wheel and it didn't move (no shaft play, wheel spun fine). When I went to spin the wheel I cut my finger on one of the blades, they were never this sharp!

I snapped a picture and instantly knew where part of my paycheck was going to be spent.

Funny thing is, it still boost to 15 psi but that was before I knew that the blades have been chewed up. This thing will not see anything above 5 psi anymore!

Here's the damage: http://i.imgur.com/qxXWJ.jpg

[Superaero]

I do not see any unusual damage. I've not seen a compressor wheel before but the vanes won't be straight. All your turbo compressor vanes are shaped in the same way so what is it you think is wrong?

Besides, a damaged turbo that still boosts should just be driven as normal. When she goes she goes and you need a rebuilt unit anyway. It is not as if they fly apart and do any damage. The bearing unit usually dies and the turbo smokes or whines.

Finally, how's your hooter valve? Shock waves resulting from closing the throttle with a non functioning hooter valve can damage the turbo compressor.

[erix920]

Here's a picture of my old t25's vanes http://i.imgur.com/By1k4.jpg, you can see that the vanes are NOT supposed to look like the ones in the td04 picture.

The diverter valve makes noise when I let off so I assume it's working.

[Superaero]

The T 25 is a Garret AirResearch unit and produces lower boost pressure. Have a look at some Mitsubishi compressor wheels before you leap to conclusions.

http://store.forcedperformance.net/m...de=Turbo-Parts

There is no way a rock can get in as the intake is filtered. Besides the suspect rock would not damage all the vanes in exactly the same way.

The advice remains the same, drive it as normal until it fails and get a rebuilt unit at that time.

[erix920]

I think when I installed my cone filter there was a gap when I tightened the rubber ring around the plastic tube.

Regardless, Im still getting the replacement CHRA!

[erix920]

Okay well I think it's finally dead. It feels like it has no power and it constantly misfiring. The error code that I read says "Misfire on cylinder 2". This can't mean that I destroyed a piston or anything right? The car still runs and if I give it gas and its under 0 psi (in vacuum) the misfire goes away. Idling though it runs like crap.

[zachc]

if u think u have a dead piston just do a compression test/or cylinder leakdown test

[Superaero]

First thing is always put a new set of plugs in, NGK and properly gapped to between 0.9 and 1.0 mm.

While you have the plugs out o a compression test.

If all is well and the plugs ate new then you have th symptoms if a dying DI cassette which is very common.

[erix920]

Once I put this new turbo in I'll try these. It happened all of sudden two days ago. As in a was driving and got into boost let off quick and then instant stuttering.