"The BIG BOV thread" (Where all bov question threads get merged) - Page 153
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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 YeloFvr In the instructions it said that the BOV was pre-set right out of the box. But ...

  1. #2281
    Registered User WRXin''s Avatar
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    Originally posted by YeloFvr
    In the instructions it said that the BOV was pre-set right out of the box. But the instructions also have a picture of a BOV being installed in an STi(the TMIC has the logo on it). Did any of you guys adjust you BOV, and if so please tell me by how much and the affect it had on your WRX. I've had mine for about a week and my gas mileage really sucks! Thanx
    Don't adjust it. It's preset, just like you said. The reason your gas milage sucks is because you keep punching the gas so you can hear the BOV Stop doing that, and you'll notice that your milage didn't change...that's what I did
    Fahd

    Floats like a butterfly and stings like when I pee!

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  3. #2282
    Registered User YeloFvr's Avatar
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    Originally posted by WRXin'
    you keep punching the gas so you can hear the BOV
    I just like seeing peoples faces when I come whistleing by . What about the picture of them installing a BOV onto an STi? Are you sure the valve is set to the WRX and not the STi? Thanx

  4. #2283
    Registered User WRXin''s Avatar
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    Originally posted by YeloFvr
    I just like seeing peoples faces when I come whistleing by . What about the picture of them installing a BOV onto an STi? Are you sure the valve is set to the WRX and not the STi? Thanx
    If you bought the WRX kit then it's set for the WRX
    Fahd

    Floats like a butterfly and stings like when I pee!

  5. #2284
    Registered User YeloFvr's Avatar
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    Thanx for all your help WRXin'

  6. #2285
    Registered User WRXin''s Avatar
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    Originally posted by YeloFvr
    Thanx for all your help WRXin'
    Anytime
    Fahd

    Floats like a butterfly and stings like when I pee!

  7. #2286
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    'nother noobie question

    with a gutted stock uppipe, and the temp sensor put back in place, will I still get a CEL, or will the computer not notice a difference?

  8. #2287
    Registered User MidnightFLAT4's Avatar
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    Quick question... I am installing my Bosal DP this week, and i am curious whether i have to worry about the 02 sensor. The third cat will stay, so that means i dont have to worry about relocation right??

    Also i searched CEL eliminator and came up empty, any advice where to go? , i may have to tolerate a CEL for 2-3 weeks before my ECU is sent to Cobb
    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.

  9. #2288
    Registered User Mattr762's Avatar
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    The rear 02 goes into the midpipe. So you don't have to worry about relocating.

    Ya, just tolerate the CEL for a couple of weeks. But, make sure and tell Trey or Josh that you want that light gone. They only do it on request.
    '02 WRX white - Uppipe, MattSpec Turbo-back, Dynorad

  10. #2289
    Registered User tubbytreats's Avatar
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    Did any of you guys replace the stock gaskets with new ones? I'm getting ScoobySport Uppipe, Downpipe, and Muffler in the mail this week and want to know if I should go get new gaskets (it's not coming with any)

    Anyone have any idea WHAT gaskets I would need and where to get them? Thanks!

    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)

  11. #2290
    Registered User hatebobbarker's Avatar
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    i suggest new gaskets
    the downpipes on MY G buzz because it needs new caskets

  12. #2291
    Registered User tubbytreats's Avatar
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    Where do I get new gaskets? I mean, do I just walk into my local dealer and say, "Hey man, I'm going to be voiding my warranty this weekend, and need a few gaskets. Can you hook me up?"

    Any ideas?

    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)

  13. #2292
    Registered User Mattr762's Avatar
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    I used the stock gaskets and have NO leaks. The uppipe/downpipe gaskets are made of "sheet" metal and will not break.
    '02 WRX white - Uppipe, MattSpec Turbo-back, Dynorad

  14. #2293
    Registered User Tlamming's Avatar
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    Blow off Valves Worthless under 20PSI?

    Guys, I was poking around on the internet and came across this article. Tell me what you think. I know its alot but it's interesting.

    Real blow-off valves are used in high boost (20+ psi) to prevent the momentary rise in boost pressure of up to 50 psi from blowing out intercooler side tanks or popping off hoses when the throttle is shut. But at normal boost levels (under 18 psi) we can use the rush of over pressure to prevent our turbocharger from stalling all the time when we lift the throttle. This helps the turbo make better throttle response and boost quicker in real world conditions.

    Enter the $35 by-pass (or priority valve) concept first developed on the AUDI rally cars and first introduced in the Audi Quattro Turbo and Porsche 944T. The very first Subaru EJ20 in 1989 also had this type valve. Your WRX has one also and we want you to keep it on your motor, unless there comes a reason to change it out.

    The compressor by-pass valve is connected from the turbocharger compressor high pressure side (intercooler) back through to the low pressure side (the intake section) just ahead of the turbo compressor. When you close the throttle to shift gears this valve opens. It makes a loop of air back into the inlet with the boost spike of air pressure in the intercooler. Everyone has probably heard a blow-off valve go 'whoosh'. Well, we want that 'whoosh' to go right back to work keeping the turbo compressor wheel from slowing down. Instead of spending money on an aftermarket blow-off valve just to make noise, we leave the factory priority valve in place. Why?

    The loop air flow effectively puts the turbocharger into a no load condition and the wheel keeps spinning. Under this very low load condition the high pressure air in the intercooler blows into the intake via the by-pass valve and pin-wheels compressor impeller. When the throttle is opened again, the turbine wheel is still spinning at a relatively high rpm and will go right back to work putting out boost.

    Without this by-pass valve feature the compressor/turbine wheels tend to stall between shifts and it takes longer to build up boost again after each shift. This is also true when the throttle is lifted in a corner for any reason. When you get back in to the gas, the by-pass valve actually is slow in closing and lets the turbine free wheel for an eye blink, bringing the boost on much quicker. Why any driver would spend money and give this throttle response advantage in away for the sake of noise of a blow-off valve is almost funny to think about. Yet, many shops will sell you a blow-off valve with a straight face. But, now you know. This is a classic case of, 'If it ain't broke, don't fix it".

  15. #2294
    Registered User driggity's Avatar
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    Thats basically a long explanation of why many people say don't replace the stock blowoff (or bypass) valve unless it can't handle the pressure you're running.
    Big pimpin' in a Legacy GT Wagon

    R.I.P. WRX Wagon

  16. #2295
    Registered User JustChou's Avatar
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    No, it's a very long explanation of why you should run a recirculating blow off valve, be it stock or otherwise.
    ~Justin Chou

    http://www.topless-racing.com
    Car talk from car guys to car lovers.

    TwinCam Motorsports
    Serving the East Bay with all your aftermarket needs.

    "Blessed are those who hunger and thirst for rightousness, for they will be filled." Matthew 5:6

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