Confusing stickys, just would like some answers
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This is a discussion on Confusing stickys, just would like some answers within the Engine Performance forums, part of the Tutorials & DIY category; I've been reading sticky's for about an hour and still have not come up with some simple answers. 2002 Subaru ...

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    Confusing stickys, just would like some answers

    I've been reading sticky's for about an hour and still have not come up with some simple answers.

    2002 Subaru Impreza WRX 5spd
    #1:What's stock boost PSI?
    #2:What can it be safely boosted to with stock fuel system?
    #3:What can the stock turbo handle?
    #4:If I upgrade the turbo & the fuel system what will the engine handle?

    If there are any of you guru's out there I would appreciate it. Let me know if any of you need help on 300zx's lol. Because that's what I'm used to dealing with.
    Thanks.

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    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by 02wrxsleeper View Post
    I've been reading sticky's for about an hour and still have not come up with some simple answers.

    2002 Subaru Impreza WRX 5spd
    #1:What's stock boost PSI?
    13.5psi
    #2:What can it be safely boosted to with stock fuel system?
    18-20psi with the stock turbo and a good tune, not MBC!!
    #3:What can the stock turbo handle?
    18-20psi (probably need to get it ported to see 20) tapering toward redline.
    #4:If I upgrade the turbo & the fuel system what will the engine handle?
    300whp is pretty safe ground.

    If there are any of you guru's out there I would appreciate it. Let me know if any of you need help on 300zx's lol. Because that's what I'm used to dealing with.
    Thanks.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    Thanks a million. Wow, its hard to believe that these motors only hold 300whp on stock internals. Guess that lets me look forward to an engine build down the road.

    I was reading earlier about the MBC & stuff. On the Z I had boost jets that the ecu was mapped to. On the WRX does the computer only control what boost you are getting or how would I "do it safely".

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    He simply abides. SD_GR's Avatar
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    You would remap boost, fuel, and timing according to your new goals. The motors tend to be more timing and fuel dependent than one might think, especially if comparing them to other motors that respond better to simply increasing boost etc.
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    Thanks for the quick reply. I have to say, this seems to be one of the best forums I have ever joined.

    As far as the response to the boost I know what you mean. My factory 300zx only had 9psi. When it was took to 18psi, the car came alive lol.

    1991 300zx Twin Turbo A/T -432rwhp (Stock internals, stock heads, stock manifolds, stock turbos) JWT ecu, JWT pop charger, 18psi boost jets, Unorthodox crank pulley, Greddy exhaust, testpipes(no cats).

    I hope I can put down some good numbers with the WRX one day.

  7. #6
    Geriatric Ginger Mod Rogan's Avatar
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    Quote Originally Posted by 02wrxsleeper View Post
    Thanks for the quick reply. I have to say, this seems to be one of the best forums I have ever joined.

    As far as the response to the boost I know what you mean. My factory 300zx only had 9psi. When it was took to 18psi, the car came alive lol.

    1991 300zx Twin Turbo A/T -432rwhp (Stock internals, stock heads, stock manifolds, stock turbos) JWT ecu, JWT pop charger, 18psi boost jets, Unorthodox crank pulley, Greddy exhaust, testpipes(no cats).

    I hope I can put down some good numbers with the WRX one day.
    I used to have a '91 Stg5 Z32tt @ 554whp.. My wrx, at 350whp pulled harder. at 400+, it would straight give the Z an ass-handing.. well, til about 130mph.. LOL

    and I agree, they [Zs] wake up at 14psi, let alone 18psi... or 21psi
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

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