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Old 04-03-2009, 12:10 PM   #21
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it might be a T3 inlet, but it's still a t25 turbo.
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Old 04-03-2009, 12:42 PM   #22
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it might be a T3 inlet, but it's still a t25 turbo.
OK... that makes sense.
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Old 04-03-2009, 12:47 PM   #23
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OK... that makes sense.
I'm going to have to agree...
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Old 04-04-2009, 05:21 PM   #24
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It's more than likely if it is a Z31 that if the older model used a T3, they wouldn't re-cast manifolds and change the flange just to run a different turbo. They'd instead get a special cast turbine housing.

Why? because they can.

Otherwise I have no explanation.
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Old 04-04-2009, 08:22 PM   #25
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So... I guess I could order a T3 manifold and a T25 downpipe...

I took the thing apart this afternoon after the Wifee and I went for a drive. I had to go by HF and get some bent needle nose pliers to get the big circlip out.

Over all the insides look really good. The turbines were really tight, before I took it apart, but the bearings and the shaft look almost like new. The exhaust side had some coking at the backside of the impeller and on the little sheetmetal shield. The thrust bearing looks new as does everything else. I'm going to clean everything up tomorrow and put it all back together and see how it spins.

I want to use it now, simply because I got it in a trade basically for free. It will be a nice car story to tell people... "Where did you get the turbo again?"

I may send it to Corky and ask him to build my turbo system around it. He told me to send it the other day, but I had already ordered my Shanghi kit. I'm kind of on the fence...
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Old 04-04-2009, 11:33 PM   #26
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Default OK... It's official... I'm Stoked.

OK... I'm pretty stoked right now. We got home and had some drinks and I decided to go downstairs into the Man Cave while my Sweetie was cooking dinner and completely tear this thing down.

I took it all the way down to the bearings and the thing is immaculate. The only problem was a very small amount of coking just at the exhaust turbine and the small formed metal housing, but all that cleaned up nicely.

I cleaned everything and oiled everything and put it all back together and the turbine spins freely and there is little to no play in the shaft. It is like a new turbo. I have attached a picture of the inlet and outlet and the turbines after I have partially assembled the unit.

I think I am going to call BEGI on Monday and ship this turbo to them and use it instead of the Shanghi turbo. I think the only change they will have to make is to ship me a T3 flanged manifold.

I have one dumb question for everyone, and I know I should probably do a search, but how do you know what people are talking about when they say their turbo is a 60 trim? If you look at the picture I am posting do you simply measure the diameters of the impeller and the compressor, and whatever diameter they are then that is what you use to determine the "trim?"

Thanks for the help so far guys...
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Old 04-06-2009, 10:32 AM   #27
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An article for you sir... TurboByGarrett.com - Turbo Tech102

Should explain it thoroughly for you in the first section.
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Old 04-06-2009, 11:52 PM   #28
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Quote:
Originally Posted by thagr81 us View Post
An article for you sir... TurboByGarrett.com - Turbo Tech102

Should explain it thoroughly for you in the first section.
Thanks for the link. That was very helpfull. I am going to take it back apart and measure everything again and do the calculations.

I double checked the flanges and the manifold flange is a T3 and the outlet flange must be a T25/T28.

It will be interesting to see how this turbo will perform. It has waterlines, and oil lines with it too, and a couple of decent heat shields and a cast downpipe also.
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Old 04-07-2009, 09:03 AM   #29
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Nice... Keep us updated on your progress.
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Old 04-07-2009, 09:51 AM   #30
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measure the inducer and exducer of both wheels (in mm). post the numbers here.
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Old 04-07-2009, 03:12 PM   #31
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^ I too am curious about the sizes...
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Old 04-07-2009, 03:22 PM   #32
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Quote:
Originally Posted by thagr81 us View Post
^ I too am curious about the sizes...
Me three...

I am going to take it back apart this afternoon when I get home and I will measure them.
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Old 04-07-2009, 03:41 PM   #33
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Awesome... That will give us a better scope of the acutal nature of this turbocharger.
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Old 04-07-2009, 08:16 PM   #34
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Default Measurements and calculations...

Ok Folks,

Bear with me I have had a couple of beers and a couple shots of Appleton rum...

Exhaust Turbine:

Inducer = 52.8mm
Exducer = 41.4mm
Trim = 162.655

Compressor Wheel

Inducer = 41mm
Exducer = 51.4mm
Trim = 63.627

I also measured the turbine Area and Radius as best as I could, because:

"Turbine performance is greatly affected by changing the A/R of the housing, as it is used to adjust the flow capacity of the turbine. Using a smaller A/R will increase the exhaust gas velocity into the turbine wheel. This provides increased turbine power at lower engine speeds, resulting in a quicker boost rise. However, a small A/R also causes the flow to enter the wheel more tangentially, which reduces the ultimate flow capacity of the turbine wheel. This will tend to increase exhaust backpressure and hence reduce the engine's ability to "breathe" effectively at high RPM, adversely affecting peak engine power."

I tried to measure the turbine inlet as close as possible, but the area that you need to measure is up in the turbine housing and you kind of have to hold your calipers up there and eyeball it.

So to the best my measuring capabilities:

Area of the turbine inlet = 1800 square mm
Radius of turbine = 60mm

Which would give us an A/R = 30

This would seem to indicate to me that this turbo will spool rather quickly and produce a pretty decent amount of low end torque, but it would limit the amount of top end horsepower that it would make.

If my numbers are correct and my interpretation of the data is correct, I may have stumbled onto a turbo that will get me to my modest goals of 225rwhp and a fast spool and loads of low end torque.

What does the braintrust think?
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Old 04-07-2009, 08:37 PM   #35
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it's a T25 turbine. (same/similar to the 2554)
the compressor wheel is about the same size as a GT2252.

expect it to perform like a 2554.



you have the ID/EX reversed on the turbine...it's a 61 trim turbine.

no imprint on the turbine housing inlet with the A/R stamped on it?
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Old 04-07-2009, 10:55 PM   #36
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Quote:
Originally Posted by Braineack View Post
it's a T25 turbine. (same/similar to the 2554)
the compressor wheel is about the same size as a GT2252.

expect it to perform like a 2554.

you have the ID/EX reversed on the turbine...it's a 61 trim turbine.

no imprint on the turbine housing inlet with the A/R stamped on it?
I was wondering the same thing about the turbine, but according to the turbobygarrett.com website, the larger of the two dimensions is the inducer and smaller is the exducer. Am I reading that picture wrong?
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Old 04-07-2009, 11:17 PM   #37
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Quote:
Originally Posted by 92Black&Tan View Post
I was wondering the same thing about the turbine, but according to the turbobygarrett.com website, the larger of the two dimensions is the inducer and smaller is the exducer. Am I reading that picture wrong?
For the intake, the inducer is small and the exducer is big. For the turbine, the inducer is big and exducer is small. It follows the airflow; IN to EX.
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Old 04-08-2009, 06:01 AM   #38
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Quote:
Originally Posted by Savington View Post
For the intake, the inducer is small and the exducer is big. For the turbine, the inducer is big and exducer is small. It follows the airflow; IN to EX.

Exactly... [Didn't you just state the the same thing that I did and just word it differently?] And the calculations on the website show the:

(inducer^2/exducer^2)100 = Trim

So for the Turbine housing:

Inducer = 52.8mm
Exducer = 41.4mm

(52.8^2/41.4^2)100 = 162.655
Trim = 162.655


So, are you guys saying that regardless of what the website says it is always the (smaller number^2/Larger Number^2)100 ?

I'm not argueing... Just trying to learn something, and just going by what the Garrett website shows...
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Old 04-08-2009, 08:07 AM   #39
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Just rough numbers, but that turbo on a 1.8L would be something akin to this:



If so, a-junkyarding I will go! Awesome score b&t
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Old 04-08-2009, 10:20 AM   #40
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Quote:
Originally Posted by DontPassTheFence View Post
Just rough numbers, but that turbo on a 1.8L would be something akin to this:

If so, a-junkyarding I will go! Awesome score b&t
Well... I'm hopefull. We'll see.

I emailed Stephanie and called since I started out with the Shanghi kit, now almost everything is deleted except the manifold and downpipe. And I have added WBO2, S.S. lines, etc...

I can't wait until I get the stuff here and can start work on this new project. I still need to figure out what I want to do for an exhaust and which ebay intercooler I want to buy. I need injectors too.
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