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Old 01-05-2009, 09:10 PM   #1
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Default Downpipe question....! Need Help

Here is my Outlet of my turbo i have no wastegate clapet that i can weld is this a problem if im planning to run an external wastegate on my mani?

GEDC1187.jpg
GEDC1186.jpg

I mean do i really need to weld something out there or i just can use this and bolt it to the rest of my exhaust.

gt28flange.jpg
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Old 01-05-2009, 09:13 PM   #2
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you would need to either weld the little hole shut or attach the wastegate. if you're running external the answer is obvious: weld the hole. otherwise the turbo will operate as if the wastegate flapper is always open, and you will get almost no boost at all
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Old 01-05-2009, 09:24 PM   #3
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What may i weld there? any idea?

Turbo is a GT2854R is this too small for my engine b6t bottom with a b6de head?

Planning around 250whp...
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Old 01-06-2009, 01:05 AM   #4
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I suggest buying a new turbine housing.
Turbo Housings
It's not listed, but I think that'll fit your GT2854r... they probably also have a v-band model for external gate. Call ATP and they'll set you straight. It's not cheap, but in the end, it'll be done correct.
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Old 01-06-2009, 10:12 AM   #5
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or use one of these:
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Old 01-06-2009, 10:36 AM   #6
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Except without a gasket. Just machine the turbine exit, and mate it metal to metal. The gasket will blow out.
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Old 01-06-2009, 10:38 AM   #7
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Quote:
Originally Posted by boisvertjean View Post
Turbo is a GT2854R is this too small for my engine b6t bottom with a b6de head?

are you sure about that?????? Must be one of those GT28XXs with the T3 turbine housing, T3 CHRA, and T3 compressor housing......


What do the numbers on that red serial plate read?


does your turbine inlet measure 1.8" x 2.3" or 1.5" x 1.9"???
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Old 01-06-2009, 11:57 PM   #8
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We've welded these shut, we just cut a piece of metal to fit, tack it in place inside the hole, then weld around.
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Old 01-07-2009, 10:00 AM   #9
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Quote:
Originally Posted by Braineack View Post
What do the numbers on that red serial plate read?


does your turbine inlet measure 1.8" x 2.3" or 1.5" x 1.9"???


yeah, I'd like to know this as well.
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Old 01-07-2009, 12:37 PM   #10
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yeah, I'd like to know this as well.
1.8 X 2.3 must be a T25 right?

Red Tags read 22413124---TBRO114H


On the turbine side it say M24 A/R 42 Next to the GARRETT
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Old 01-07-2009, 12:41 PM   #11
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Except without a gasket. Just machine the turbine exit, and mate it metal to metal. The gasket will blow out.

What do you mean by machining the turbine exit?
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Old 01-07-2009, 12:49 PM   #12
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Quote:
Originally Posted by boisvertjean View Post
1.8 X 2.3 must be a T25 right?

that's a t3 inlet size...


Quote:
On the turbine side it say M24 A/R 42 Next to the GARRETT
you mean compressor? and it look just like #4 and #5 in this pic:

you have yourself a standard journal bearing T3.
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Old 01-07-2009, 01:07 PM   #13
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Quote:
Originally Posted by boisvertjean View Post
What do you mean by machining the turbine exit?
Machine the turbine housing flat if you use the block off plate that M2cupcar posted to avoid it leaking.

Frank
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Old 01-07-2009, 01:17 PM   #14
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Quote:
Originally Posted by Braineack View Post
that's a t3 inlet size...




you mean compressor? and it look just like #4 and #5 in this pic:

you have yourself a standard journal bearing T3.
Compressor sorry i have paid 400$ for this turbo and it is used worth that money? is this turbo good for my setup?
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Old 01-07-2009, 01:19 PM   #15
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It is if it's at least a 55 trim. Remove the compressor housing (wastegate actuator and 2 plates on back of the housing) and measure the inducer diameter.
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Old 01-07-2009, 01:21 PM   #16
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ill check that and ill repost damm ive been trapt :(
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Old 01-07-2009, 02:12 PM   #17
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on the compressor side i got 42mm inducer and 60mm exducer look like the gt2259 except this turbo is supposed to be free float
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Old 01-07-2009, 02:51 PM   #18
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that's a 50 trim.

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Old 01-07-2009, 02:52 PM   #19
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then? :S a bit small i think?....
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Old 01-07-2009, 02:55 PM   #20
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It can output around 27 lb/min.

It will be a turbo with a compressor wheel just slightly smaller than the 2560, but a turbine wheel just slightly larger than the 2860.

It will more or less perform like a 2554, not as fast spooling, but with more power potential. IIRC Arkmage has a t3 with that trim, see his dyno plots: https://www.miataturbo.net/forum/t18609/
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