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Thread: How To - Coolant bypass

  1. #1
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    Default How To - Coolant bypass

    Hi guys

    i did this, this afternoon took the best part of 30 min's to do with parts that are easy to comes by, it will help keep your boost air temps down by removing the 100+ deg water from flowing through it, that heats up the throttle body and in turn all the air that passes through it

    First what you will need
    Click image for larger version. 

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    A pair of plier's
    2 x 6 or 8mm vacuum caps or similar - Supercheap Auto - i used 6mm bit hard to get on but are snug on there
    2 x small zip ties - Supercheap Auto
    1 x 5/16 double male ended brass connection piece - Masters - bunnings don't stock these and don't use the plastic ones from supercheap
    I flushed my coolant system in the process so i also grabbed
    4 x demineralized Water - coles
    and i had some coolant laying around
    And i replaced the bulldog clamps with proper ones
    All up i think it was around $25

    Now first of all pop your bonnet (i drained my coolant first) and locate you throttle body, now remove the two hoses pictured below
    Click image for larger version. 

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    Next push one of the ends of the connector piece into one of the coolant hoses any clamp it down then push the other coolant pipe over other end of the connector and clamp it down,
    it should look something like this (i didn't want to cut my hose to size just yet)
    Click image for larger version. 

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    Next work the vacuum caps on to the exposed metal coolant pipe's and zip tie then on securely like below
    Click image for larger version. 

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    now if you emptied your coolant top it back up to the top with the coolant additive and demineralized (cap on) and the reservoir (don't worry if you cant get the same amount back in to the radiator that came out) and start the engine wait till it start to get warm then take it on a quick run around the block, pop your hood and you will notice that your reservoir is now empty fill it up again, now another run around the block and check again repeat until the level in the reservoir doesn't drop anymore

    And your done
    Last edited by Axspeed6; 23-07-2012 at 05:01 AM.
    05 VR 6 MPS LUXURY - WHATS STOCK????
    Winner of Most modified @ Smokeys car meet
    UP an coming events: Winton Track day 17th December

    Remember pay by the 16th of November and get free lunch and drinks on day
    Next install: New Head, ARP Studs, Upgraded VVT, BSD, Mazdaspeed Coil Cover, Injector seals + studs

  2. #2
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    Default

    Obvious question... why would we do this?

  3. #3
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    Default

    Keeps your boost cooler and you know

  4. #4

    Default

    And why did mazda put it there in the first place??

  5. #5
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    Emissions.

    Quote Originally Posted by Duk View Post
    And why did mazda put it there in the first place??

  6. #6
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    2% emission saving 3-8% power loss depends on motor
    the EGR is a similar thing with 3-5% emission saving but dirties your motor with carbon and robs you of power

  7. #7
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    Default

    To close off the coolant hoses you only clamped it? Did do anything else?

  8. #8

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    Did this a little while ago and put new gasket on, helps lower the temps a bit, good cheap mod.

  9. #9

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    You guys are fine to do this but in a cold country it prevents freezing also.
    I'll leave my one as it is as can see -10 easily in winter time.
    How cold are your winters!?

  10. #10

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    Quote Originally Posted by kevstewart View Post
    You guys are fine to do this but in a cold country it prevents freezing also.
    I'll leave my one as it is as can see -10 easily in winter time.
    How cold are your winters!?
    Correct, if if was under 0 here id leave it but I'm lucky to see 0 overnight where I am.
    '05 6 MPS | BNR S3 | JBR 3.5" Intake | Corksport Airbox | CP-E 3.25" TMIC | M2 DP | CP-E CBE | CP-E/TT Diff Mounts | Autotech HPFP Internals | JBR REM, PMM, TMM | SURE Shortcut | SURE Countershift | SURE Anchors | Denso ITV22s | JBR TIGs | EGR Delete | Coolant Bypass | PTP Inj Seals | MD OCC | H&R Springs | Bilstein B8 Shocks | Car-LED Tails | Badgeless Grille | 6000k HIDs | OZ Ultraleggera 18x8 +48





  11. #11
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    Quote Originally Posted by Bakis View Post
    To close off the coolant hoses you only clamped it? Did do anything else?
    @Bakis They arent closed off they are joined look at the pic's thats what the connectors for applicable part below read the post

    "Next push one of the ends of the connector piece into one of the coolant hoses any clamp it down then push the other coolant pipe over other end of the connector and clamp it down,
    it should look something like this (i didn't want to cut my hose to size just yet)"
    Last edited by Axspeed6; 23-07-2012 at 05:03 AM.
    05 VR 6 MPS LUXURY - WHATS STOCK????
    Winner of Most modified @ Smokeys car meet
    UP an coming events: Winton Track day 17th December

    Remember pay by the 16th of November and get free lunch and drinks on day
    Next install: New Head, ARP Studs, Upgraded VVT, BSD, Mazdaspeed Coil Cover, Injector seals + studs

  12. #12
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    Ok lol now i understand that picture before i was like o_O

  13. Default

    sorry guys what is the "new gasket" for?

    Thanks in advance

  14. #14
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    just another insulating barrier against the heat in the manifold but most gains are made through the bypass itself

  15. #15

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    any logs to show the exact benefits?

  16. #16
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    if my logging was working i would have them but its not but its a well tried and test mod for most if not all turbo charged cars that dont live in below 0 deg c weather, but any mod that gets you cooler BAT's is a good mod

  17. #17
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    I did this but instead of the join i just removed the hoses and capped off where the hoses come from.

  18. #18
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    I don't have logs but my Dashhawk has shown about a 15 degree to 30 degree drop in boost temps while stationary and while driving around about 8 - 10 degrees and when turning car on after being turned off for about 1 - 2 hours or so the temps go back to normal so quickly compared to be before

  19. #19

    Default How To - Coolant bypass

    Quote Originally Posted by Bakis View Post
    I don't have logs but my Dashhawk has shown about a 15 degree to 30 degree drop in boost temps while stationary and while driving around about 8 - 10 degrees and when turning car on after being turned off for about 1 - 2 hours or so the temps go back to normal so quickly compared to be before
    Haha man. Can you punctuate that so I can tell if what you're saying is good or not?

  20. #20
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    Quote Originally Posted by ledfootrob View Post
    I did this but instead of the join i just removed the hoses and capped off where the hoses come from.
    thats what I was thinking of doing. what did you use to cap them off?
    Former 06 Black MPS3

    EXE-Crew



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