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Old 10-22-2012, 09:21 PM   #1
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Default t25 turbo off??

Hi Guys,

Looking for new turbo spacifically a GT2554, is whats been recomended and decided on.

does anyone know what they are off? am i right in saying that they are off a sr20?

Thanks

Andy
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Old 10-22-2012, 10:01 PM   #2
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You are wrong.
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Old 10-22-2012, 10:07 PM   #3
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Quote:
Originally Posted by thirdgen View Post
You are wrong.
Yep, you are wrong, but going in the right direction. The sr20 has a t25 that is very similar in specs and behavior to the GT2554 but is not one. The sr20 t25 is journal bearing and the GT2554 is ball bearing. A little less glamorous and not as free spinning or flowing.

However, the sr20 t25 is what you want if you think the turbo will be upgraded in the future or are fine with ~200 whp. Cheap, rebuildable, and fits all the great t25 flanged DPs out there.

If you're convinced you want an actual GT2554, check this out:
https://www.miataturbo.net/miata-par...4-turbo-68968/
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Old 10-22-2012, 10:16 PM   #4
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gtfo 200 with a t25. I have seen guys on this site make more at 15psi.
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Old 10-22-2012, 10:22 PM   #5
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I made 225 with 12 psi.
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Old 10-22-2012, 10:23 PM   #6
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Quote:
Originally Posted by Saml01 View Post
gtfo 200 with a t25. I have seen guys on this site make more at 15psi.
Sam's right, you can squeeze out a good bit more than 200 with an efficient setup and upping the boost. Just dont be expecting 250 whp, especially if you're stock on a 1.6L motor.

Do some more searching for sr20 t25 setups, NOT GT2554 setups (unless thats what you are really after)

What motor and specs are you planning on using?
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Old 10-23-2012, 04:13 AM   #7
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Sr20 t25 sounds like its what I'm looking for.. Thanks for the help guys
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Old 10-23-2012, 09:23 AM   #8
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one last one for yous haha. what is the turbo called? e.g GT....

Thanks

Andy
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Old 10-23-2012, 10:40 AM   #9
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It's just known as a t25 from a red or blacktop s13...the s14 is a t28.
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Old 10-23-2012, 02:25 PM   #10
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It's also called an SR20, S13, T25, T25g... I think the S15 version is ball bearing and closer to a GT2560R.

Todd: Are the S14s significantly different from the S13s?

Pay attention to the turbine AR though. There was some discussion a while back about a T25 pattern turbo with a .46 or .48 housing or something? Its small, like, really small. TOO small. Do a search here on MT and read A LOT.
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Old 10-23-2012, 02:38 PM   #11
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The s13 and s14 use the same .64 turbine. Same wheel size and all...I think it's 53mm? I'll upload better info later tonight.
The s13 uses a compressor (t25) with a 56mm 60 trim wheel. The s14 uses a t28 compressor with a 60mm 60trim wheel. The s14 is basically a journal bearing gt2560. The s15 uses a ball bearing chra.
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Old 10-24-2012, 11:40 AM   #12
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Thanks for all the info guys much appriciated big help
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Old 10-24-2012, 11:45 AM   #13
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Don't buy a T25 from a Nissan 300ZX twin turbo. I did that and paid a terrible price. It's a very small turbo so I made 14psi at like 3000rpm, but once I hit 4500rpm my power went WAY down. It was an awful boost curve. It also uses a different downpipe flange than the regular t25 flange on the other nissans.


And yes, 200 torque at 3000rpm is ridiculous. First gear was so much fun with this setup, but every other gear was laughable. Also, if you wanted to be really cool, you could get a T28 from a Nissan Pulsar GTi-R. That would be a perfect fit.
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Old 10-24-2012, 12:30 PM   #14
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^^^your problem wasn't all in the turbo...
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Old 10-24-2012, 12:50 PM   #15
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^^^your problem wasn't all in the turbo...
Haha I did indeed have lots of other problems - small exhaust was a big one. But I would've been WAY better off buying a sr20 T25 turbo than the 300zx one.
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Old 10-24-2012, 02:16 PM   #16
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Dustin: Good lord... that turbo would be perfect for my mother and her 4500rpm shiftpoints What exhaust was that poor thing trying to breathe through? I always thought of that as a small but viable turbo for a street application, what all went wrong here or am I way off base?

Also: lol @ "Meatyata"
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Old 10-24-2012, 04:32 PM   #17
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Quote:
Originally Posted by EO2K View Post
Dustin: Good lord... that turbo would be perfect for my mother and her 4500rpm shiftpoints What exhaust was that poor thing trying to breathe through? I always thought of that as a small but viable turbo for a street application, what all went wrong here or am I way off base?

Also: lol @ "Meatyata"
First off, the turbo was way too small. Picture of small turbo:


Downpipe was custom made divorced gas that went into 2.5". Then it went into a stock catalytic converter and a 2.25" obx cat back.
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Old 10-24-2012, 04:34 PM   #18
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Quote:
Originally Posted by dustinb View Post

Downpipe was custom made divorced gas that went into 2.5". Then it went into a stock catalytic converter and a 2.25" obx cat back.
Uhh, maybe that is why it had **** top end. Any turbo is going to suck on a 2.25" exhaust.
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Old 10-24-2012, 04:37 PM   #19
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Uhh, maybe that is why it had **** top end. Any turbo is going to suck on a 2.25" exhaust.
Not necessarily. My friend had a 92 miata with a modified greddy kit. Stock cat and 2.25" exhaust. He got up to 214 wheel horse and a good power curve. I think my downpipe was the biggest culprit.
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Old 10-25-2012, 07:37 PM   #20
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what size of exhaust would yous recomend?
I have had a look at lots of T25G and either my computer is being usless or I am ( probably me) but what flange is on manifold I have seen 2 types, a circular one with 2 bolts and a square one with 4 bolts?
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