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Old 05-07-2008, 03:56 PM   #1
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Default Begi gt28 or gt25

for the expert which of turbo would you go with and what are the differences? which one is best for the miata motor?
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Old 05-07-2008, 03:57 PM   #2
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needs more "what do i want from my miata" info.
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Old 05-07-2008, 04:05 PM   #3
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Used both and my impression is that the GT25 spools faster, but the GT28 will give you more power in the end. I now have the GT25 and love it because it kicks in fast. As Scott said, a matetr of choice.
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Old 05-07-2008, 04:30 PM   #4
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Depends on how badly you want to cut the factory outlet flange off and spend money or fabricate an inlet adapter.
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Old 05-07-2008, 05:37 PM   #5
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t88
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Old 05-07-2008, 05:58 PM   #6
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Wouldnt it also depend on which T25 or T28. Theres a difference between a T2554 and a T2560, no?
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Old 05-07-2008, 06:09 PM   #7
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wasn't the gt2560r called a GT28R for a while?

I run a completely custom gt2560r on my gutted auto-x/street car but decided to buy the BEGi S with 2554 for my daily driver. I have no intention of going to a turbo exhaust from my RB Duals or a custom manifold so I went with a turbo that should still spool quickly with those restrictions. I also only have power goals of 175-200 in mind for that car and should be able to achieve that safely with the MSPNP and 460's already installed & chinacooler from Scott. I'm hoping the spool of the 2554 on the BEGi mani and dp will be comparable to my 2560 setup on the other car.
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Old 05-07-2008, 08:00 PM   #8
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When I made my choice I took the GT2560 and added a 3" exhaust. It gives about the same spool up of the smaller GT 2554
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Old 05-07-2008, 09:25 PM   #9
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If you are wanting more than 240hp go with the gt2860rs.
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Old 05-07-2008, 09:48 PM   #10
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Quote:
Originally Posted by keinayo View Post
Used both and my impression is that the GT25 spools faster, but the GT28 will give you more power in the end. I now have the GT25 and love it because it kicks in fast. As Scott said, a matetr of choice.
Keinayo, from what RPMs do you start seeing boost with the GT25 and the same question for the GT28?
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Old 05-07-2008, 11:29 PM   #11
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great thread...i had the same question......one more for you guys: when you say quick spool or late spool, what rpm are we talkin about here?
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Old 05-07-2008, 11:51 PM   #12
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Quote:
Originally Posted by 18psi View Post
great thread...i had the same question......one more for you guys: when you say quick spool or late spool, what rpm are we talkin about here?
Onset around 2500 and full spool at 3k is early. Onset at 3k and full spool at 4k is late.

edit: educated guess btw
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Old 05-08-2008, 12:01 AM   #13
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ok thats not too bad, its pretty good actually. anyone know where a td04 (from a wrx if you will) fits into that? im curious cause im planning on using that temporarily till i build an engine. ive seen dyno charts as high as 250whp on that turbo, anyone here using one?
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