1.8s with Sr20 T25s. Some info please - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-30-2012, 12:51 PM   #21
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Quote:
Originally Posted by AllSystemsNominal View Post
How close is the turbine side of the T25 (.64ar) to that of the gt2560 ???
These are specs of the common SR20 turbo:
Compressor: T-25, 60 trim 56mm BCI-1 compressor.
Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.
Center Section: Journal bearings

These are specs of the S14 turbo that has the larger wheel:
Compressor: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing
Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.
Center Section: Ball Bearing

Same turbine/ wheel size. Larger compressor/ wheel.

Specs on the GT2554 from the garrett website:
Compressor: 54.30mm 60 trim wheel
Turbine: 53.00mm
Center Section: Ball Bearing

Specs on the GT2560 turbo from the garrett website:
Compressor: 60.10mm 60 trim wheel
Turbine: 53.00mm
Center Section: Ball Bearing

It appears that the SR20 turbo is actually a bit larger than a gt2554. It also looks like garrett uses the same turbine/ wheel for the 2560 and 2554, just different compressors/ wheels. Makes sense to me. Larger compressor wheel means larger volume of air will be displaced.
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Old 08-30-2012, 01:03 PM   #22
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For that same money you could get a s14 T28 which is single ball bearing ...

EDIT... 3rd gen covered it
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Old 08-30-2012, 01:07 PM   #23
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I have been looking for an s14 t28 forever. Let me know if you find one. I want it.
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Old 08-30-2012, 02:39 PM   #24
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Todd, do you ever look at Zilvia.net for a s14 t28? They pop up all the time there.

Ray
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Old 08-30-2012, 03:20 PM   #25
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Quote:
Originally Posted by RayinNorCal View Post
Todd, do you ever look at Zilvia.net for a s14 t28? They pop up all the time there.

Ray
Really? I didn't see any while I was looking for my t25, but then again it didn't take long before I bought one. How much do you see them going for?
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Old 08-30-2012, 04:07 PM   #26
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Adam, I think the last time I checked there was one for $400, but if I remember correctly he said it could probably use a rebuild. I don't know if there are any currently for sale but that would be the first place I would look for one.

Ray
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Old 08-30-2012, 05:50 PM   #27
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I had one. Sold it with my SR when I parted out my 240. Regret it a lot. They are somewhat hard to come by.
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Old 08-31-2012, 04:28 AM   #28
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Old 08-31-2012, 06:35 AM   #29
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Yes and no...I'm looking for "selling my blown s14 turbo. The chra is seized, but the compressor/ wheel is good....$50"
Let me know when that gets found.
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Old 08-31-2012, 09:17 AM   #30
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do you just want a compressor wheel? I have a 50 trim t3 wheel and compressor housing you can duct tape to your chra...that'll make it a t28.

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1.8s with Sr20 T25s. Some info please-t3_vs_t25_wheel.jpg  
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Old 08-31-2012, 10:05 AM   #31
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Lol @ duct tape...pm me brainy, if serious.
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Old 08-31-2012, 10:10 AM   #32
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if i can find it
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Old 09-02-2012, 12:54 AM   #33
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For anyone looking for a cheap T25/T28, I was around 240's before miatas. This one works great and is probably the CHEAPEST you will find anywhere that isn't from ebay.

*ISIS T25/T28 Replacement Turbo - Nissan SR20DET - Enjuku Racing Parts, LLC

If you want a 2871 sized turbo the same company makes this turbo as well.

http://www.enjukuracing.com/products...n-SR20DET.html

Final edit? - I think these (both links) are journal bearing not ball bearing, fwiw.
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Old 09-02-2012, 01:56 PM   #34
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Quote:
Originally Posted by TheGrim View Post

If you want a 2871 sized turbo the same company makes this turbo as well.

*ISIS RS3871 Turbo - Nissan SR20DET - Enjuku Racing Parts, LLC.
A quick google search reveals that these turbos are actually really good units. The warranty on them is rock solid as well.
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