Are T25 and GT25 outlet flanges the same? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-06-2007, 03:43 AM   #1
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Default Are T25 and GT25 outlet flanges the same?

Hi Guys,

Long time lurker... First thread started!

I have a T25 housing that has been ceramic coated which i will be putting on the HKS mani i have right now early in the new year.

My issue is the I will be making a DP for it as the current one is a 4 bolt.

I was looking at one of these:

ATP Adapter

It would help me create a better flowing DP (I don't need divorced wastegates) locally with my current welding abilities. I have a TIG that will be used for the rest of the fabrication.

Would a GT25 housing be the same in dimesnions and stud placement as a T25?

(I haven't been able to find dimensions to prove this as of yet)
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Old 12-06-2007, 07:09 AM   #2
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The short answer is no they are not all the same, I know of at least three. I have had the same problom, trying to mate a 4bolt (nissan 300zx) and a 5 bolt from a SR20DET.

My solution was to take some 1/2" plate and just cut out the flange in I needed. I was working with SS at the time, so my options were semi limited
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Old 12-06-2007, 10:55 AM   #3
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there's a 4 bolt, and two five bolts.

the 4-bolts aren't common, and one of the 5 bolts is very common and universal. Occasionally you;ll see a 5-bolt outlet with a built in divider, these are a special turbine housing that came on the nissan GTRs, they are slightly different.

The one pictured above is you typical 5-bolter.


iirc the 4-bolt might be the same as the td04...i can't remember.
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Old 12-06-2007, 11:25 AM   #4
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Just for reference... I have a used one of those Vband adapters for sale.

I also have a t25/gt25 Vband modded turbine housing. Setup for external WG though.

https://www.miataturbo.net/forum/showthread.php?t=14070
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Old 12-07-2007, 04:10 AM   #5
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Thanks for the replies guys.
I should have said, I have a 5 bolt T25 housing that will be used to replace the current 4 bolt (it is tiny atm with a .48 AR).

But Splitime is on the money with what he has for sale.

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