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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 10-08-2015, 05:34 PM   #1
LivelyZ
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Sr20blacktop

Hey I purchased a 240sx a week or so ago claiming to make 240-250whp

. It's running a greddy (?) exhaust, stock blacktop turbo, K&n air filter, apexi standalone, maf deleted, bov, fmic, etc. Anyways I believe it's on the stock fuel system. currently running 8-9psi of boost. Is there more room on a stock motor for more boost? 10-12 psi or is that asking for trouble ? What size injectors are needed to make more power? Any other recommendations?
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Last edited by LivelyZ; 10-08-2015 at 05:52 PM.. Reason: added info
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Old 10-08-2015, 07:12 PM   #2
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If it is an S14 engine with the S14 JDM Ball Brearing unit you can safely go to 12psi. More is possible but it will wear the turbo out quickly, especially if you had a shitty bypass.

Its on an apexi stand-alone unit, so your best option for more power is to install 740cc injectors, and a GT2871r or similar turbo, for a 320rwhp on stock cams, or 350-370rwhp with a set of upgrade cams (S3 JWT I recommend for OEM springs)
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Old 10-09-2015, 08:32 AM   #3
LivelyZ
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I was told it was a s15 black top with s15 turbo , i believe since it's a swap I may only have the ka24 fuel pump
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