T28 vs T25
#1
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Here's the deal.
My 1.6 Mk1 is currently running a T28 which is unfortunately coming to the end of its life, plumes of smoke coming out when giving it the beans due to buggered seals.
I've been looking for a T28 for a few days now and can't seem to find one but a T25 has cropped up for decent enough money. Would I notice any difference if I used the T25 instead of a direct replacement T28?
There is also a T28 from a S15 which is a ball bearing turbo compared to mine which is a journal one that has cropped up for a bit more than the T25. Would a BB turbo be any better on such a small, revvy engine as the B6ZE?
My 1.6 Mk1 is currently running a T28 which is unfortunately coming to the end of its life, plumes of smoke coming out when giving it the beans due to buggered seals.
I've been looking for a T28 for a few days now and can't seem to find one but a T25 has cropped up for decent enough money. Would I notice any difference if I used the T25 instead of a direct replacement T28?
There is also a T28 from a S15 which is a ball bearing turbo compared to mine which is a journal one that has cropped up for a bit more than the T25. Would a BB turbo be any better on such a small, revvy engine as the B6ZE?
#2
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BB turbo will give better spool up (300rpm-500rpm)
The T25's such as T2554 (journal version of the GT2554) or T2560 Garrett's are great.
T28's are a bit laggy on a non built engine running less than 14psi boost.
You can get the T28 rebuilt at home using online parts and then get it balanced. Or mark the compressor wheel to shaft and re assembly in the same orientation and take your chances.
The T25's such as T2554 (journal version of the GT2554) or T2560 Garrett's are great.
T28's are a bit laggy on a non built engine running less than 14psi boost.
You can get the T28 rebuilt at home using online parts and then get it balanced. Or mark the compressor wheel to shaft and re assembly in the same orientation and take your chances.
#3
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
BB turbo will give better spool up (300rpm-500rpm)
The T25's such as T2554 (journal version of the GT2554) or T2560 Garrett's are great.
T28's are a bit laggy on a non built engine running less than 14psi boost.
You can get the T28 rebuilt at home using online parts and then get it balanced. Or mark the compressor wheel to shaft and re assembly in the same orientation and take your chances.
The T25's such as T2554 (journal version of the GT2554) or T2560 Garrett's are great.
T28's are a bit laggy on a non built engine running less than 14psi boost.
You can get the T28 rebuilt at home using online parts and then get it balanced. Or mark the compressor wheel to shaft and re assembly in the same orientation and take your chances.
I've noticed no lag using my T28 at 9psi.
I've looked into rebuilding it but I'd prefer just doing a swap as I've already spent a load of money in the last few months replacing the engine so just want a relatively cheap, quick fix for now.
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