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Old 08-20-2007, 09:39 PM   #1
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Default TO4 turbine housing swap possible? *Pics Inside*

I have this turbo, my dad gave it to me. The compressor would be fine but the damn turbine housing is HUGEMONGO. Can you say an A/R of ~1.3.
Is there a way to swap turbine housings. I have no idea what vehicle this turbo came off of, but I'm going to assume it came off a big diesel.

The wheels are perfect and the shaft has minimal play, not out of spec by any means. This turbo is alot like what lazzer had and used for his compressor swap. Does anyone have any idea what kind of housing I might be able to swap onto this badboy? I could just sell it to recoupe some cost of a different turbo. Or I could find a smaller T3 and swap the larger compressor like lazzer. Open to all opinions and options outside of bolting it onto the miata to see when it would spool. I'm guessing 5k rpm. It would be great to find out that I could just swap on a smaller A/R turbine housing.
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Last edited by cjernigan; 08-20-2007 at 09:50 PM.
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Old 08-20-2007, 10:41 PM   #2
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I'd pick up a t3 in a 63 or 48 AR housing then use the coldside from that turbo to build your hybrid.

Or.. get a bigger t3 turbine housing and have a machine shop make the wheel fit correctly.
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Old 08-20-2007, 11:46 PM   #3
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pretty much the same here...not only will you have to find a t3 exhaust assembly but you'll have to get it balanced too...but heck i would just sell that turbo and buy a new one!!!...just to save the trouble and time..
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Old 08-21-2007, 12:04 AM   #4
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Why not block off one port and reduce the A/R that way? Would it work, I think it might. It's an interesting idea, if nothing else.

Mark
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Old 08-21-2007, 12:25 AM   #5
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wouldnt that sort of screw up the flow in a major way?
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Old 08-21-2007, 01:06 AM   #6
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lol Mark sounds like a great idea. Do you think I can use packing peanuts to block the port?

I think i'll just sell it. Anyone want it?
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Old 08-21-2007, 01:07 AM   #7
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Oh yeah, local balancing to high tollerances is $30-35 if I wanted to do it, no big deal.
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Old 08-21-2007, 02:28 AM   #8
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at that price...i say it'll be fun to see how the turbo performs...that turbo with a t3 turbine wheel would be nice but its hard to find just the exhaust side assembly though!
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Old 08-21-2007, 07:48 AM   #9
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That's just like the compressor I just swapped out on my Saab T3 with the .48 turbine. Works great so far. Mine looked like this after I cleaned it up. I didn't get pics of the t3/t4 I made with it yet.
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Here's the t3/t4
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Last edited by lazzer408; 08-27-2007 at 02:18 AM.
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Old 08-21-2007, 07:50 AM   #10
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I have an extra T3 laying around too btw. Interested? Oh and also... I didn't balance the hybrid. Sounds smooooth.
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Old 08-22-2007, 02:42 AM   #11
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Can you give me specs and pics of the CHRA and turbine outlet?
Internal gate?
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Old 08-22-2007, 03:01 AM   #12
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CHRA? cartridge? It's oil cooled. Compressor .42, Turbine .48, Internal gate. Your T4 compressor would fit on it.
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Old 08-22-2007, 03:28 AM   #13
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Quote:
Originally Posted by Markp View Post
Why not block off one port and reduce the A/R that way? Would it work, I think it might. It's an interesting idea, if nothing else.

Mark
Quote:
Originally Posted by akaryrye View Post
wouldnt that sort of screw up the flow in a major way?
Yes
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Old 08-22-2007, 03:56 PM   #14
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Quote:
Originally Posted by lazzer408 View Post
Yes
How do you figure? If you block of half the port and there is no flow in that port, how does that screw up flow?

Mark
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Old 08-22-2007, 04:30 PM   #15
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Quote:
Originally Posted by Markp View Post
How do you figure? If you block of half the port and there is no flow in that port, how does that screw up flow?
That's not really how a twin scroll turbo works...

Save that turbo for your tractor.
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Old 08-22-2007, 05:05 PM   #16
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Quote:
Originally Posted by Markp View Post
How do you figure? If you block of half the port and there is no flow in that port, how does that screw up flow?

Mark
The turbine wheel needs X cfm of air flow passing over the blades to work efficiently. Amount 'A' comes from one port, Amount 'B' come from the other port and together total X. It's a divided housing to keep turbulence down inside the turbine housing. It's still too large a turbine for 1.8L of exhaust gas to spool.
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Old 08-22-2007, 10:04 PM   #17
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Yes, but by blocking one of the ports you effectively reduce the A/R of the turbine, which is what we were talking about, not the trim of the turbine wheel.

Mark
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Old 08-22-2007, 10:21 PM   #18
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yes theoretically by limiting the inport to 1 you will increase the exhaust velocity but i dunno if you are gonna run into choke flow issues doing that. I sure wouldn't try. Chad don't you have a s60 laying around somewhere?
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Old 08-22-2007, 10:57 PM   #19
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Yes you would but the wheel still needs a much larger volume then the Miata can flow even if the velocity is increased. The T4 radius is to large to get any real velocity. If I took the wheel from that turbine, and machined a T3 turbine housing to fit, it might spool it eventually. =) hmm I might look into doing that if there's enough metal in the T3 to allow it.
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Old 08-23-2007, 05:38 PM   #20
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Quote:
Originally Posted by magnamx-5 View Post
yes theoretically by limiting the inport to 1 you will increase the exhaust velocity but i dunno if you are gonna run into choke flow issues doing that. I sure wouldn't try. Chad don't you have a s60 laying around somewhere?
Nope if i did have a s60 around it would be on the car already man. Might rig something up with this TO4 compressor.
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