Max boost for an STI
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This is a discussion on Max boost for an STI within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; What is the stock boost and max boost that a stock '04 STi can take?...

  1. #1
    Registered User Rowerkr's Avatar
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    Max boost for an STI

    What is the stock boost and max boost that a stock '04 STi can take?
    '04 WRX STi

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  3. #2
    Boba Fett BrianH's Avatar
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    not sure what stock boost is, but "max boost" is going to depend on your setup.

  4. #3
    Registered User 240toSTi's Avatar
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    i believe it is 14.5 psi stock.
    06 VF39'd WRX 270awhp 295wtq @15psi
    Should I OpenSource and ditch the AP?
    Hawk-Eye Alliance #006

  5. #4
    Registered User 04subie's Avatar
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    Stock boost is 14.5...with the stock setup you can buy a mbc and maxout at 17.0 thats about it for stock....Hope this help's

  6. #5
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    72 psi
    14.160@96.011
    90 degree weather
    airhog, removed silencer, and removed stock catback exhaust (stock DPs in place) and craptacular california 91 octane piss water

  7. #6
    Registered User anthonywrx's Avatar
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    from reading around here looks like 20PSi is what some of these guys run, which is what i plan on once i put in my 6-speed (obviously that much psi is with a TUNE, do not just raise your boost without some sort of engine management)
    Quote Originally Posted by psb02wrx
    while you carpe diem, tell her to carpe deez nuts.
    Fun In the Snow
    STi in the making...

  8. #7
    Registered User Rowerkr's Avatar
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    Thanks for the info.
    '04 WRX STi

  9. #8
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    10,000 PSI Honestly i think its arounnd 17 18 range but that might be pushing it on the internals
    Tomorrow isn't a guarantee.

  10. #9
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    on stock turbo i hit 19 to 20 tuned though

  11. #10
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    i'm tuned running at 18psi max

  12. #11
    Registered User STiDriven's Avatar
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    18psi is pushing it on the stock turbo, making more heat than power. Some people might be able to go 19-20 with supporting mods and a good tune.

    Mine makes 13.8psi stock right now, trying to figure that out....

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