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Thread: Installation of aftermarket BOV on 1JZ

  1. #1
    Soaring Along! Automotive Encyclopaedia Danners's Avatar
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    Default Installation of aftermarket BOV on 1JZ

    Hi All,

    I recently had a front mount, and stainless piping installed on my 1J converted MZ20. I've had a Blitz DD blow off valve sitting in my shed for ages waiting for the new piping, so that I have something to weld a flange onto.

    My question is... The stock 1J BOV is literally part of the intake piping, and to remove it would require some kind of plate to block off its previous location. I'm not really sure how much of it needs to be removed if anything at all.

    Can anyone that has installed an aftermarket BOV on their 1J please share their setup with me? Photos would be much appreciated.

    Thanks guys!
    Dan

  2. #2
    Show Us Your Tints Carport Converter Soarer_D00D's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    I've got a wingle turbo now, but i'd imagine it wouldnt be that hard. Just block off the stock BOV pipe flange with a plate, and fit the new one closest to the ThrottleBody as possible. If your plumbing it back, pumb it back into the air intake.

    Check my members rides thread for pics of how i installed mine. I'll send you a more detailed version later (re: Paint) but im at work now and cant do much.



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  3. #3
    regular fella Conversion King chris davey's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    you can actually leave it connected. Just means that if the first one doesn't let enough air out then the stock one will do the rest. Otherwise, I think on soarercentral, someone sells blocking plates. Then block any hoses that it had attached to it.
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    R.I.P. Pentamax Chief Engine Builder Adsport's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    leave the stock one connected and pull the vacum line off, run a bit of hose to the venting port and hang your BOV off the end of that.

    using a plate where the stock BOV is the ideal way
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  5. #5
    Ex GZ20/1JZGTE Owner =( Backyard Mechanic White Knight's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    Yea, I just left the stock bov connected and pulled the vacum lines off it. The vacum line from the bov to the intake plenum is at the back part of the plenum so I just ran a vac line from there to the new GReddy Type-S bov which is welded to the intercooler pipe between the throttle body and intercooler.
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  6. #6
    www.malicious.com.au Automotive Encyclopaedia ReQuieM's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    Vac line and a couple of caps. Remove the thick hose that runs between the bov and the piping under pressure and cap the connectors. The stopper on the legs of chairs (available from bunnings) work well!
    Malicious

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    Soaring Along! Automotive Encyclopaedia Danners's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    Thanks heaps guys!
    Dan

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    Soaring Along! Automotive Encyclopaedia Danners's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    +rep for all
    Dan

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    -Street Drag Machine- Grease Monkey renxun's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    sorri i would like to ask why would an after market bov would be best mount as near possible to the throttle body...?

    due to space constrain i mount my greddy type R bov in between the turbine and the intercooler ... around 2 feet frm the turbo only... wat would i be expecting frm such setup?

  10. #10
    Toymods Pimp Chief Engine Builder Norbie's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    It really makes SFA difference where you put it. Note that Toyota mounts the BOV right near the turbos on the JZ series engines, and they probably know what they're doing.

  11. #11
    RIP Scott Kalitta Automotive Encyclopaedia Mr DOHC's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    logically, wouldnt it be best to put it b4 the cooler, that way u arent expelling cooled air, thus the cooler had had to soak up less heat
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    www.malicious.com.au Automotive Encyclopaedia ReQuieM's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    Acording to the theiry its best just before the throttle body as thats where the 'harmful' pulse of compressed air starts. Its to nip it in the bud. Plus thats whe the point of most pressure will be so it makes sense.
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  13. #13
    Toymods Pimp Chief Engine Builder Norbie's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    These "pulses" you speak of move at the speed of sound, so will travel from one end of the cooler piping to the other in a tiny fraction of a second. Given the speed at which a BOV will open (ie much slower than that), the mounting position isn't going to make a gnat's dick of difference.

  14. #14
    www.malicious.com.au Automotive Encyclopaedia ReQuieM's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    Thats the popular theiry. I never said it was correct! I agree they aint gonna get the pulse, but it is the point whe the blockage will occur.

    There must be some validity to the 'closer to the throttle body' argument cos all the porc-a la-mans cars used to run a bov from the plenum with their ITB set up.
    Malicious

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  15. #15
    CROSSPLANE CRANK! Domestic Engineer Merudo's Avatar
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    Default Re: Installation of aftermarket BOV on 1JZ

    Quote Originally Posted by ReQuieM
    Acording to the theiry its best just before the throttle body as thats where the 'harmful' pulse of compressed air starts. Its to nip it in the bud. Plus thats whe the point of most pressure will be so it makes sense.

    Harmful? riiight.

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