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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-29-2011, 10:02 PM   #1
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sr20det t25

quick question,

is the t25 out of a silvia bigger than the turbo in the 99 9-3?

would it be a reasonable upgrade for stage 2-3?

thanks
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Old 09-29-2011, 10:08 PM   #2
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your turbo is fine for stage 2-3
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Old 09-29-2011, 10:23 PM   #3
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oh i know,

so are the wheels in the s13/14 turbo bigger than the gt17?
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Old 09-30-2011, 05:39 AM   #4
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those turbos only support 17psi before they like to blow up.
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Old 09-30-2011, 06:42 AM   #5
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you have a T25 not a gt17

they likely not too different but i'm not sure what t25 you want to swap, but here is the compressor map

http://www.miataturbo.net/attachment...3&d=1248494186

the GT17 is a bit smaller which is why the t7 have a bit less hp and torque at stage 3

I wouldn't swap a t25 for another t25, I'd say with a lsd and gt28rs is a great compromise for responsiveness and top end power.
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Old 09-30-2011, 09:41 AM   #6
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i'd swap a t25 for another t25
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Old 09-30-2011, 09:41 AM   #7
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some sr20s have gt28. i think it matters if its a red top or black
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Old 09-30-2011, 09:45 AM   #8
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if you need a new turbo I have a t25 for sale....
i mean it would be the same thing as any other t25, and direct bolt on.
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Old 09-30-2011, 02:25 PM   #9
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There's no reason to even think about switching turbos unless you're going to go bigger, after all the money and time you'll spend.

If you want a good bump in power, make/look for a T28 or a GT28.
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