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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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04-02-2018, 10:43 PM | #1 |
Leaky Injector
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What turbo
I currently have an old isr(isis) t25/t28 replacement turbo, but also an older isis rs3871, that i plan on rebuilding and putting in instead. Are the power gains worth it? Whats the difference in lag? What numbers have people gotten with each? Need to know before going to martin for a tune.
Ty for any feedback My supporting mods BC springs and retainers ISR M spec intercooler 555cc injectors z32 maf |
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04-03-2018, 12:15 AM | #2 |
Zilvia FREAK!
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First off, both of those turbos are doo-doo.
Secondly, your engine in it's current state will make about 300whp. You should be looking for an OEM T28, S15 turbo, or a GT(X)286xR. A GT(X)2871R would be more appropriate if you had cams, metal headgasket and 740cc injectors, and were gunning for 400whp. |
04-03-2018, 12:28 AM | #3 | |
Leaky Injector
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04-03-2018, 12:14 PM | #4 | |
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What turbo
The RS3871 is basically a 2871 with a journal bearing center. I would rebuild that. It's going to be a little laggy but worth it over a t25/28 clone.
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Naw man, you got to drop a stroker kit in there, 280 cams, solid lifters, 1000cc injectors and a efr9180. Then you can save up to swap in a real motor... /s
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04-04-2018, 10:58 PM | #5 | |
Zilvia FREAK!
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But I guess to answer your question, the 3871 can make more boost, but will spool more slowly. But at the same time, your motor isn't ready for high boost. It's pretty much a standard 15psi setup. The car will be quicker overall with a smaller turbo at that power level. Have you tried turning the T28/T28 replacement up to 15psi? |
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04-04-2018, 11:07 PM | #6 | |
Leaky Injector
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04-04-2018, 11:09 PM | #7 | |
Leaky Injector
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04-04-2018, 11:19 PM | #8 | |
Zilvia FREAK!
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The metal headgasket is good, you can start turning up the boost. But you're quickly running out of injector. Your 550's can support about 320-340whp. But that's kind of a weird power level: the T25/T28 can't make that much, and it's not really optimizing the 3871. You'd be running it really low. To me, it only makes sense to switch to the 3871 if you swap to 740cc injectors, grab some 256 or 260 cams, and turn it up to 20 psi for 350-400whp. |
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04-04-2018, 11:23 PM | #9 | |
Zilvia FREAK!
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You're talking about gaining 20-40whp with 1000 RPM slower spool time. I think that sort of trade-off is only worth it if you're gaining 50-100whp. |
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04-04-2018, 11:30 PM | #10 | |
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