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Thread: Dawes valve. Will I need one.

  1. #1
    Patrol Guru Coldcomfort's Avatar
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    Dawes valve. Will I need one.

    Hi all, I have a 2012 that I bought new. I have just ordered a Beaudesert Exhaust sysen fron the local exhaust place here in the Alice. I have been trying to find out if I will need a dawes valve. I have already fitted a boost/EGT gauge (Redarc)and the exhaust guys says that Beaudesert will fit the 1/8 NPT bung that my gauge needs. I guess that I should mention that I also have a HPD intercooler and steel inter cooler pipes.

    What have others noticed? Is the dawes valve a must do?

    Cheers, Brian.
    Be the person that your dog thinks you are!!

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    Patrol Freak Bidja's Avatar
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    My preference is use manual boost control (dawes/tiilix and needle) to control your max boost (eliminate boost spike)/EGTs and spool rate. IMO, suggest installing your Beaudesert Exhaust sys, hook up your EGT gauge, record some boost and EGT readings with VNT solenoid control (stock) first. Observe EGT/boost behavior and then go ahead and fit your manual boost control sys. Take some boost readings before exhaust install (good info) for comparison purposes.

    Have you done any NADS install (egr plate/catch can)?
    2008 GU WAG ST Manual CRD - To do the job

  4. The Following User Says Thank You to Bidja For This Useful Post:

    Coldcomfort (9th July 2018)

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    Patrol Guru Coldcomfort's Avatar
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    Thanks Bidja I have a HPD catch can. My Egt is not hooked up yet as I was debating with my self if I was going to keep the stock exhaust and have the bung welded into that. But the mechanic thought that the dump pie would have to be taken off to weld the bung in. My boost never goes above 15 PSI at the moment.

    Cheers Brian.
    Be the person that your dog thinks you are!!

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    Patrol Guru Coldcomfort's Avatar
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    Next question. Is there a brand of Dawes I should not buy? And where is a good place to buy?

    Cheers.
    Be the person that your dog thinks you are!!

  7. #5
    The master farter
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    Quote Originally Posted by Coldcomfort View Post
    Next question. Is there a brand of Dawes I should not buy? And where is a good place to buy?

    Cheers.
    PM me mate, I used to be the Aussie distributor until the creator of these caved and will only sell in bulk to MTQ. Every seller on eBay sell the Chinese copies. so be careful.

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    Patrol Freak Bidja's Avatar
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    Brian, sounds like your VNT solenoid control is managing boost well leave it in place until you do your EGT probe and get some performance data baseline readings then do Dawes/needle.

    I would change your exhaust system. Beaudesert is 2.75" dia?, I have 3'" (your choice), IMO diesel eng do like a bit of back pressure. The turbo exhaust wheel does provide adequate back pressure even using straight through exhaust, I run a stage 3 H/F Procharge turbo at 25 psi and use a CAT/Muffler(moded to higher flow) exhaust.

    With dawes you should achieve very reliable max boost max of 16-16.5 psi, maybe even higher and get the advantage of lower EGTs.

    You want the latest dawes design (3 Bar Racing /Black Body). I have a spare one of these that I bought of mudski, only if you are interested( 3 months used). I do like the Dawes and could play all day trialing dawes against tillix (currently fitted). They are both good. If interested we could work something out and mudski (Mark) could help you out with the needle valve and bits. It is an offer only, not fussed. Think about blanking off the EGR assy with a solid plate at the exhaust manifold when doing exhaust, block both ends (good idea), you could easily do the inlet manifold end and save yourself a couple of $$. You will need a scan tool to clear any fault codes that may appear if you do not have one. UltraGauge EM plus is good (CRD/OBD11 compliant) approx $149AUD direct from manufacturer in the USA, provide great parameters kW & N-m also, this is why I bought one and decent display.
    2008 GU WAG ST Manual CRD - To do the job

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    Coldcomfort (9th July 2018)

  10. #7
    Patrol Guru Coldcomfort's Avatar
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    Thanks. That’s a lot to take rite now. Given that I have had a few ales.....

    I’ll log back in tomorrow and take a look st it all.

    I really appreciate you guys helping me out.

    Cheers, Brian.
    Be the person that your dog thinks you are!!

  11. #8
    Patrol Guru Coldcomfort's Avatar
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    Gidday, Bidja, PM me the details of the dawes you have for sale and I will xfer the $$ any way you like. I got a email from Mudski saying that this was the way to go.

    Cheers, Brian.
    Be the person that your dog thinks you are!!

  12. #9
    The master farter
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    if you need instructions mate, shoot me your email and I'll send it to you.

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    Patrol Freak Bidja's Avatar
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    Quote Originally Posted by Coldcomfort View Post
    Gidday, Bidja, PM me the details of the dawes you have for sale and I will xfer the $$ any way you like. I got a email from Mudski saying that this was the way to go.

    Cheers, Brian.
    Brian, am prepared to provide you with Dawes that I have but are you going to do needle and egr blanking plates as well (complete kit cost consideration & postage)?
    Have another read of my post #6.

    Do you have scan tool?
    What SS induction pipework do you have (Fabwitz)?
    What IC (stock or TIG welded/size)?

    Have been in hospital for a coupole of days.
    2008 GU WAG ST Manual CRD - To do the job

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