Turbo housing cracked , bad ??

[ROOKIE1]

The part of the turbo that bolts to the manifold . It has a large crack in it . My mani had a 3in crack on top and a 4 in crack on the bottom . So I got an evoiii mani to swap out . I noticed long cracks in housing , but can not tell if they go all the way through . I am guessing this is bad . But just wanted to be sure . Thanks

 

[hereitcomes]

Depending on the size of the crack (hairline or a spaced crack) you will loose functionality of the turbo, and may loose boost. If the crack was big enough boost could just escape through the flange on the turbo - and you wouldnt boost anything - blow smoke, and have a huge power loss.
I would get a new flange, or turbine housing. Perhaps it is a good opportunity for a rebuild? Im not sure of your budget.
good luck man!!!

 

[ROOKIE1]

It is a hairline crack . A big hair though . There are actually two cracks . I sometimes get a high pitch noise under boost (10-14 psi) .

 

[oddrob]

Do you have a pic you could post? Most all turbine housings will crack over time.

 

[RippinGSX]

Where exactly is it cracked?

 

[ROOKIE1]

If you are looking into the top of housing , it is cracked above and below the holes to the o2 housing . I have a sony camera , but not very good at sizing photos. Any help there ?

 

[RippinGSX]

Wow!! Iv'e never actually seen a turbine housing crack on the top like that. I assume that's the original 1g turbine housing that came on the car? Time to replace it for sure.

 

[ROOKIE1]

Lets try these . It was replaced back in 96-97 .

 

[RippinGSX]

Ah, that's inside the turbine housing. As long as they are not all the way through to the outside, it should be ok. You could definetly use some portwork there.

 

[ROOKIE1]

Will not be able to see if through until I remove the o2 housing . By the way , this looks alot better than the manifold I took off .

 

[rcarrier]

I have 2 extra housings that are perfect if you need one
make me and offer if you would like to have one.

 

[RippinGSX]

If it was the original 1g manifold, that doesn't suprise me one bit. Mine was cracked all the way through all 4 runners on the bottom when I took it off. I couldn't believe it didn't just break in half. The EVO will hold up much better due to it's much higher nickle content. Mines been on for a few years with no cracks and high boost. I am now switching to a tubular manifold so I'll see how that holds up. Not getting rid of my EVO mani yet.

 

[ROOKIE1]

Ok , so decided to just replace turbo . Evoiii 16g is my choice . I have a 3" turboback from rnr with external dump . Do I need a port job on turbo ? Do I also need the flapper mod done ?

 

[RippinGSX]

Yes you need to port it. Port the turbine housing inlet. I actually ended up removing most of the divider between the wastegate exit and the turbine side to eliminate creep completely. There is a pictur of this on Dejons website if you don't know what I'm talking about. The wastegate upgrade is really not needed as long as you port the wastegate exit hole and I recommend removing some of the metal behind the flapper arm so it can open further. I run the EVO316G with these modifications and have 0 creep issues anymore.

 

[ROOKIE1]

So , even with the larger turbo back exhaust , you think boost creep will be an issue ?

 

[RippinGSX]

Yes. A larger exhaust will cause even more creep. The EVO16G doesn't even like to run at under 20psi without creeping. Trust me. That's why I did the portwork, to eliminate my creep problems. The EVO is notorious for it's creep problems. It's a great turbo as long as you do the portwork unless your not worried about creeping to 25-26lbs.