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Thread: Dawes and Needle valve

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    Dawes and Needle valve

    Hi all, just a quick note to tell you I have finally got around to having the Dawes and Needle valves fitted. Have kept stock boost level (15psi) which my stock patrol would only ever reach 14 no matter what the revs ?? The needle valve has been set to give a slightly quicker boost actuation. What a difference .. much smoother/powerful at lower RPM and more power on hilly sections where I live. Egt is fine as well .... to all those who havent done this mod yet (or am I the last), then I do encourage you to get it done. Had mine done at Southwest Mechanical and Offroad, Bunbury WA ...

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    growler2058 (16th January 2021), MB (15th January 2021), mudski (15th January 2021), Yeti's Beast (15th January 2021)

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    This needs to be done to all modern diesels not just Patrols. I sold 100’s of kits to workshops and owners of Tritons, Navaras, Hilux’s etc etc. Anything with a variable vane turbo needs this mod in my opinion. Letting the ECU decided on boost pressures is just asking for trouble.


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    I was a bit shocked at how effective it is to be honest .. and my max was 14 but that extra 1psi makes a heck of a lot of difference. The quicker response at lower rpm is a godsend in traffic too .. very happy😁👍🏻

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    Quote Originally Posted by timbo2410 View Post
    I was a bit shocked at how effective it is to be honest .. and my max was 14 but that extra 1psi makes a heck of a lot of difference. The quicker response at lower rpm is a godsend in traffic too .. very happy
    When I had the old ZD it was running 25psi and that was really good. Drove fantastic.


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    Why the dinosaur engine conversion then Mark Mate? Did it go pop or you just needed more low down slow slug clutch saving torque like us family needed too?


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    Quote Originally Posted by MB View Post
    Why the dinosaur engine conversion then Mark Mate? Did it go pop or you just needed more low down slow slug clutch saving torque like us family needed too?


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    The injector pump died on the ZD, I wasn’t prepared to spend a cent more on this donk. Hence the TD conversion. After the conversion was done we stripped the ZD and number 4 piston was cracked anyway so it was just a matter of time...


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    We too truly loved our zippy as all get up 2002 ZD, albeit bog stock OEM Mate!
    It’s only two downfalls for us found were clutch shagging potential predicted hauling Nags through the slow welfare careful hill starts. Second was a piss poor OEM intercooler strength design which kept hissy fitting with a shipload less than 25psi shoved through her


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    Can the Dawes valve be used on petrol engines with variable vane turbo??

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    Quote Originally Posted by timbo2410 View Post
    Can the Dawes valve be used on petrol engines with variable vane turbo??
    If the turbo is controlled using vacuum and not boost pressure. I can’t see why not.


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