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  #1  
Old June 6th, 2015, 12:32 AM
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gene
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Any turbo experts here?

I am having my turbo rebuilt and there are some cracks in it. Are they serious? The shop doesnt' seem to think so. Oh yea, it's the exhaust housing.
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Old June 6th, 2015, 12:41 AM
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Gene,
You may want to read thru this before spending any money on a rebuild.
http://www.defendersource.com/forum/...rbo-61900.html
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Old June 6th, 2015, 01:01 AM
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Thanks Dave,

Was following that thread until yesterday. I have the T2 turbo, a rebuild is some $300 less than a new, by the time shipping from the UK is factored in. Now I am at the "how much is the not having to worry about it falling apart on a trip" worth point. Hopefully it is the last thing to sort out before my project is done.
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Old June 6th, 2015, 01:05 AM
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If you have a friend who is talented with a TIG torch he may be able to fix the cracks but I'm not sure what it is actually made of so that may not even be an option. I too would be worried about those cracks. Lets see what the now sleeping east coast brain trust has to say when they roll out of bed in a few hours.
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Old June 6th, 2015, 01:11 AM
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Cast iron. I do know a welder who can weld it but this is pretty tricky and involves airflow and waste gate. Got all weekend to listen......
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Old June 6th, 2015, 09:30 AM
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That looks bad to me. I've got plenty of turbo experience in the import tuner world. Typically cracks in the turbine housing cause boost lag. That large crack through the wastegate flapper seat would for sure cause that. Although it could be welded, depending on your costs you'd be closer to a new turbo. Cast iron has to be pre-heated, back flow purged, and done extremely slow. After that the wastegate flapper seat would need to be machined flat again to ensure a proper seal. There is a good chance that it would crack in the same spots again due to it's brittle nature. Maybe someone has a good turbine housing laying around?
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Old June 6th, 2015, 09:36 AM
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To me, it wouldnt be worth wondering after repair if/when it was going to blow. Every road trip would be a gamble. Piece of mind for a few hundred more makes sense.
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Old June 9th, 2015, 08:37 PM
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i am with the folks who say the hotside is done. also check center shaft for bluing indicative of overheat. my guess is that bearings are bad as well.

my opinion: time for a new turbo. even an unrebuilt used unit would be better.
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Old June 14th, 2015, 02:50 PM
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try defenders north west, a customer sourced a new t2 for less than a grand, while purchasing from the paddock, shipping to the us and customs would have put a singe unit in about 1500 dollar range.
that crack looks small but when you add the heat from the exhaust it grows, thus impeding failure.
in third world countries I have seen welding of said fails but only because sourcing such parts is akin to pulling teeth with out pain killers.
good luck.
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Old June 14th, 2015, 04:01 PM
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Pull a KKK out of old Porsche 930...that mill won't know what hit it...

All joking aside, could you find a similar Garret that may have been more prevalent in the US and thus cheaper...with a manual boost adjustment isnt that the main issue..boost pressure?
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  #11  
Old June 14th, 2015, 05:07 PM
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Quote:
Originally Posted by icnsltmfg View Post
Pull a KKK out of old Porsche 930...that mill won't know what hit it...

All joking aside, could you find a similar Garret that may have been more prevalent in the US and thus cheaper...with a manual boost adjustment isnt that the main issue..boost pressure?
Turbos are sensitive to a lot of configurations, they all don't pump out boost in any car in any condition. Wheel sizing, A/R ratio and Trim need to be tailored to the application.
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Old June 14th, 2015, 05:09 PM
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Best use for that is to be melted down and recast into something else. With all the heat and pressure, you're risking catastrophic failure.
Replace.
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Old June 14th, 2015, 07:33 PM
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t2 rebuild kits are less than $100. I see 1200-1300 degree's on my egt gauge daily. Once a crack starts in cast iron the 1000 plus degree heating and cooling cycles will accelerate it quickly . YMMV
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Old June 14th, 2015, 08:00 PM
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Quote:
Originally Posted by BlackField View Post
Turbos are sensitive to a lot of configurations, they all don't pump out boost in any car in any condition. Wheel sizing, A/R ratio and Trim need to be tailored to the application.
I figured there was some technical aspects, but wasn't exactly sure...thx
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Old June 14th, 2015, 09:07 PM
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pardon my spell check it is meant to have read "impending failure", not impeding.
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