"The BIG BOV thread" (Where all bov question threads get merged) - Page 186

This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally posted by Mattr762 There is very little to no advantange to swapping out for the STi turbo-back. It still ...

  1. #2776
    Registered User snvin's Avatar
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    Originally posted by Mattr762
    There is very little to no advantange to swapping out for the STi turbo-back. It still has 2 cats and is 2.25" in diameter just like the WRX.
    Anybody else surprised by this? I mean - with the STi putting out ~73hp more at the crank than a regular WRX, you'd think the STi turboback would be better in some way?

    If it's the same diameter, is there something else different about it?

    -Vin
    '04 Platinum Silver Wagon, 5MT
    RIP '00 Integra

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  3. #2777
    Registered User hatebobbarker's Avatar
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    half a liter
    turbo size
    internals too i assume

  4. #2778
    Registered User snvin's Avatar
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    Originally posted by hatebobbarker
    half a liter
    turbo size
    internals too i assume
    I don't mean the engine - it's obvious that that's different... I was asking if the exhaust itself is different in any way to account for the extra power that the STi puts out.
    '04 Platinum Silver Wagon, 5MT
    RIP '00 Integra

  5. #2779
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    APS blow off valve good?

    wondering if anyone has any feedback on this. also ive heard some blow off valves people are losing hp on stis or call stalls. has anyone had this prob with the aps one on a sti?

  6. #2780
    afpdl's Avatar
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    Alex

  7. #2781
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    Thanks

  8. #2782
    Registered User tubbytreats's Avatar
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    I would disagree with this reasoning. OTHER than the fact that the STOCK STI exhaust has no cat in the uppipe, either turboback exhaust from either the WRX or the STI will be VERY SIMILAR in performance. (I know the STI has a higher flow Prodrive muffler, so maybe a moderate 5BHP gain there or so)

    I think everyone would agree that any increased power in the STI is due to:
    1. Larger engine displacement
    2. Larger turbo
    3. Variable valve timing
    4. Better Intercooler, Injectors, Fuel Pump, etc

    2002 WRX Mods:
    AP Stage2/93, ScoobySport Up, Dp, & Muffler, SS AutoChrome TMIC, Hawker PC680T Battery, Injen CAI, ACT Stage2 Clutch, Gruppe-S 13.8lb Flywheel, Mobil1 and Redline oil, NGK BKR7EIX plugs, Goodridge SS Lines, Motul RBF600, Hawk HPS pads, 35% 3M tint, Koji Headlight Mod, SilverStar Bulbs, Blaupunkt MP3000 headunit, Infinity BassLink Sub, Kenwood KFC-1689ie speakers (6.5"F / 5.25"R), Rota Downshift (Black), Yokohama AVS ES100 (225/45/17)

  9. #2783
    Registered User LukeWRX's Avatar
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    also ive heard some blow off valves people are losing hp on stis or call stalls. has anyone had this prob with the aps one on a sti?
    I had a Forge BOV 100% on my STi, ran with no probs and sounded great.

    BUT, after a race with an EVO which I dont think should have lost by that much(rolling start) some Clubwrx members said maybe my BOV could be costing power.

    I took it off, and was performing the butt dyno with my Fiance in the car HER WORDS:

    "WOAH your car feels faster, hey where is the pssshhh sound it was cute"

    Well aside from the cute comment, her unbiased observation was that my car felt faster. FWIW
    2004 STi

    Blitz DTT-DCII
    COBB Stage 2
    Invidia Catless DP
    HKS Hiper Cat-back
    Greddy: EGT, Boost, Oil Press Gauges
    Perrin Oil Catch Can

  10. #2784
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    I just installed an APS BOV on my STi. Sounds good. Do not notice any loss of power. No cel's or drivability issues at all.
    2004 STi silver/silver
    2001 BWM 330i
    2000 Ford Lightning 12.52 @ 108.1mph
    1999 Donzi ZX-33 (twin 600hp 502's)

  11. #2785
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    ok i think ill spend the money for the short shifter, htanks guys

  12. #2786
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    I consider it more of a novelty mod. Won't really come into play unless you are in the mega h/p class. Picked mine up on ebay cheap. Other wise I would have waited.
    2004 STi silver/silver
    2001 BWM 330i
    2000 Ford Lightning 12.52 @ 108.1mph
    1999 Donzi ZX-33 (twin 600hp 502's)

  13. #2787
    Moderator smorris's Avatar
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    I Support ClubWRX

    Moved!

    Moving to Engine Performance.

    You've asked this same (or similar) question several times, and have been repeatedly referred to the EP forum.
    .
    .
    .

    Steve - Avon, Ohio, USA - Moderator - Fun Drives and North Central States
    The Morris Garage
    2008 Outback 2.5XT Ltd __2002 WRX Wagon __ 1958 MGA Roadster __ 2008 smart Cabrio __ and a few scooters...
    Bugeye Mafia #338

  14. #2788
    Registered User MidnightFLAT4's Avatar
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    i smile enough from my stock bov with intake resonator removed
    03 MBP WRX Sedan
    STi RA gearset October 4th,STi Trans Mount
    Cobb AccessECU STG II 16.4psi. Bosal DP, Catless OEM UP, 205/55 ZR16 Futura Ultra Z's.

  15. #2789
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    i just put it in sti forum because its easier since all the sti guys mostly come here

  16. #2790
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    spark plug anti-fouler fix?

    I never heard of that one. Could someone explain it?

    For $300 i'd get things in this order:

    1) boost gauge (even w/o any other mods it'll help you get more speed)
    2) EGT gauge (necessary for ANY performance mods)
    3) MBC (till you can afford real engine management)
    4) used stock up-pipe to clean out the inside of all that metal
    5) Axxis Ultimate brake pads (starting with) the front

    I threw away the stock pads (@ 4-6 K miles) and then a set of all-round Porterfields (@ 12-15 K miles) before finding the Axxis Ulitmates stopped with a real bite. Going faster is dangerous unless you can stop faster. With the stock pads, i'd stomp on the brakes .... and wait ... and wait. Not good.
    -----

    UTEC, MRT turbo-back, Autospeed up-pipe, K&N squeeze-in, 4-nozzle intercooler sprayer, DBT drilled/slotted front rotors, Axxis Ultimate OEM replacements, NitrousExpress 50-shot w. WOT and RPM-window switches and heater and blanket, Autometer EGT and nitrous pressure gauges on pillar pod, fire extinguisher.
    Last edited by ABQnitrous; 01-30-2004 at 08:37 PM.

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