What causes this?

[quadracer111]

My car has had an hks turboback for the past year or so... I think it was when I was doing some donuts in some deep(ish) snow the cold snow+extreme heat from turbo=crack, a long with the age of it and any stress.

[Bugsly17]

there is no weight on that part of the turbo, thats the compressor housing, not the turbine housing, even if the exhaust wasnt secured, the weight would be taken up by the turbine housing, and the up pipe.

plus, the turbo is also supported by a bracket that is bolted to the block and trans on the EJ20G.


weight had nothing to do with causing this to crack

due to the fact that it is clearly the exhaust side of the turbo, yesh that does support a great amount of weight.

[quadracer111]

A fellow jdm subie owner just removed his turbo yesterday/today. And look what he found...





He said it has 187,000km's on it, mine only had 79,000km's :| Looks to be a very similar crack.

[Dragon Humper]

You must have bead blasted yours, because that's the way they should look, all rustly and sh1t. They both cracked in the same place, my money is on heat cycling right at the turbine throat (with more emphasis on the hot end of it). They could have made that flange a little thicker or used a better grade of cast iron (or used steel). I bet the area under the flange is the first to start glowing when you are flogging the car.



Jon.

[quadracer111]

The shop that was doing my car sent the turbo out to get rebuilt/balanced and they cleaned everything all up. It did look like that.

It's unfortunate, have to keep a very close eye on things I guess.