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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 01-24-2008, 01:13 AM   #1
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Default How is my free turbo?

I got a free turbo from a buddy of mine who says it is a T25, but doesn't know anything else about it. He used it on his single slam civic setup, and it is tiny.

From the Garrett SN I found it to be off of a 88-90 Pontiac Sunbird GT, but I can not find any maps/info about it.

It is a T25; Turbine .49AR Compressor either .43AR or .48AR, it is hard to tell.

So what am I looking at for the limit of this turbo? All I am looking for is around 200hp at the wheels.
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Old 01-24-2008, 01:20 AM   #2
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what size motor did the the sunbird gt have at what power was it making stock?
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Old 01-24-2008, 01:22 AM   #3
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It was a 2.0L and I believe it was rated at 155hp stock.
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Old 01-24-2008, 12:53 PM   #4
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You might be able to make it. I have a turbo similar to that on my floor, don't expect to much, you'll probably have to max it out to get much over 200 out of it.
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Old 01-24-2008, 01:00 PM   #5
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sell it and buy a bigger turboz
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Old 01-24-2008, 01:12 PM   #6
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It is the exact same specs as a DSM turbo. It's the perfect unit IMHO for a 200whp application. It will spool practically off idle with EBC and still be very efficient in the 10-12psi range you'll need to get there. Anything bigger is really overkill for that power goal. Even my SR20det T25 sacrifices a little spool to that one, but will stay efficient well into the 220-230range.

It also has the benefit of being a standard T2 flange... so your mani and DP will bolt up to practically any other T25/T28 out there (not including the DSM turbo's which use a funky turbine flange), so upgrading to any GT turbo for well over 250whp is just a credit-card away.

My recommendations, UNLESS YOU KNOW FOR SURE IT'S MECHANICALLY SOUND, is to purchase a GPopShop rebuild kit for $80. and it'll be good for 100k miles.
http://www.gpopshop.com/garrettt2kits.html
Here's how to rebuild one:
https://www.miataturbo.net/forum/showthread.php?t=10996

That turbo, plus MS and a Begi Mani/DP combo with 460's a small intercooler will get you 200whp in the 10-11psi range.

You'll need 12psi with bandaids.
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Old 01-24-2008, 03:39 PM   #7
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Quote:
Originally Posted by coastertrav View Post
He used it on his single slam civic setup, and it is tiny.
:gay:
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Old 01-24-2008, 04:57 PM   #8
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Cool, and I know the turbo is good. The guy I bought it from bought it new, and used it for less than 10K miles.
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Old 01-24-2008, 05:08 PM   #9
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What are you thinking about for the rest of your setup?
200whp should be really easy with that turbo.
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Old 01-25-2008, 04:23 AM   #10
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I am probably going to go with either the BEGi T25 mani, or see what comes up for sale soon. I can custom build my own DP for cheap so that is not a problem. Custom I/C setup. I will probably go with the e-manage as far as tuning unless I can convince myself that megasquirt can be done for cheap enough and be worth the trouble.
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Old 01-25-2008, 04:30 AM   #11
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Should be a fun set up. :-) No worries, get some decent managment and go beat on it, and know that you'll swap it out later.
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Old 01-25-2008, 03:01 PM   #12
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Yeah that is the idea.

I am trying to do this fairly cheaply, and I can always switch the turbo out later. For now though the money I would have been spending on a turbo can go towards something else. Like a clutch.
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