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Thread: Air box mods

  1. #31
    Patrol God threedogs's Avatar
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    Quote Originally Posted by mullet_hunter View Post
    I think there will be pretty good gains wiv what ur wanting to archive with ur intended mods to airbox.. Not a zd30 but I'm pretty sure this is what u want.. 3 inch streight frm airbox lid to turbo but with the the original maf housing modified to be part of that particular intake system... Keep up the good work and let us knw how u go.. Cheers mullet..

    Attachment 56122
    You hit the nail on the head ,not bad for a chippy lol
    That original photo shows all he's done is replace the OE tubing with 63mm,
    looks neat IMO

    Can someone explain why the billet HPD MAF sensor is better than the OE,
    I can understand a larger throttle body, Please explain,,,,,,,,,,,
    Attached Images Attached Images
    Last edited by threedogs; 13th March 2015 at 08:38 AM.
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  2. #32
    The master farter mudski's Avatar
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    Quote Originally Posted by threedogs View Post

    Can someone explain why the billet HPD MAF sensor is better than the OE,
    I can understand a larger throttle body, Please explain,,,,,,,,,,,
    I'll try to explain the best I can here....
    The slightly larger I.D allows more air to pass over the MAF. The MAF has a sensor plate which heats up from power running through it, more throttle = more power, and gets cooled by the air passing over it. I don't know how to explain it technically as I'm not auto sparky, but the heat produced on the plate gets converted into voltage (or something along the lines of that) and is read by the ecu. If this voltage goes over a certain limit, you see limp mode. So having a larger I.D housing, allows more air to pass over the MAF at the same throttle rate.
    So say if there was 200cfm of air going over the maf at 3000rpm with the stock housing. With the larger i.d at 3000rpm there would be 250cfm of air. (those figures aren't actual...) So more air at the same throttle response.

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    threedogs (13th March 2015)

  4. #33
    Patrol God threedogs's Avatar
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    Stock intake is only 63mm I think so if thats right an OE MAF housing might be say 55mm the HPD is now equal to
    the OE piping at 63mm, [for comparison only]so the HPD is equal to the OE piping, there abouts
    That being the case if I fit a MAF housing in a 63mm or 76mm pipe for that matter then I've acheived the same thing.
    I propose putting the MAF about where the OE one is.
    I think when volts reach 4 volts on the MAF you'll hit limp mode

    Surely this HPD MAF housing on its own cant do much
    its only 50mm long and you're using the existing plumbing
    you either need to up grade the OE piping or go bigger again like I want to.
    To Mark and MH can you say your Patrol goes faster/better because of this mod.
    Last edited by threedogs; 13th March 2015 at 05:58 PM.
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  5. #34
    The master farter mudski's Avatar
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    Quote Originally Posted by threedogs View Post
    Stock intake is only 63mm I think so if thats right an OE MAF housing might be say 55mm the HPD is now equal to
    the OE piping at 63mm, [for comparison only]so the HPD is equal to the OE piping, there abouts
    That being the case if I fit a MAF housing in a 63mm or 76mm pipe for that matter then I've acheived the same thing.
    I propose putting the MAF about where the OE one is.
    I think when volts reach 4 volts on the MAF you'll hit limp mode

    Surely this HPD MAF housing on its own cant do much
    its only 50mm long and you're using the existing plumbing
    you either need to up grade the OE piping or go bigger again like I want to.
    To Mark and MH can you say your Patrol goes faster/better because of this mod.
    Dr Gary had issues and he went out and bought the HPD maf housing and he's loving it now. It's proven this housing does what it's designed too. As for your question John. If you just put this housing in and do nothing, you won't see jack chit in performance. It's only when you start to raise the boost you will find you won't see limp mode. This is what this housing is designed for. Don't get it confused with bolt on performance, where you install it and then go wow. It's only designed to eradicate limp mode issues.

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    threedogs (14th March 2015)

  7. #35
    Expert mullet_hunter's Avatar
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    Quote Originally Posted by mudski View Post
    Dr Gary had issues and he went out and bought the HPD maf housing and he's loving it now. It's proven this housing does what it's designed too. As for your question John. If you just put this housing in and do nothing, you won't see jack chit in performance. It's only when you start to raise the boost you will find you won't see limp mode. This is what this housing is designed for. Don't get it confused with bolt on performance, where you install it and then go wow. It's only designed to eradicate limp mode issues.
    Well said.. its not like a bolt on extra hp mod.. it allows u to run higher boost levels with out limp mode.. ie u can run double factory boost which means lower egts and higher performance through out rev range.. mine pulls hrd in 3rd and i can see upto 28 psi on the gauge... but im pretty sure ur intended mods will see similar results.. cheers mullet

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    threedogs (14th March 2015)

  9. #36
    Patrol God threedogs's Avatar
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    just find it strange thats all When the MAF holder arrives from MH I'll measure the inside diameter.
    Whats the inside diam. of the HPD unit ??
    Just saying as you only get more air over the width of the HPD unit
    before that air is travelling through OE size piping
    and after is OE size piping, so if that was the case if I could increase
    the diam of the OE maf housing I've acheived the same thing.
    Also do you use the OE MAF sensor or do HPD supply one

    found a length of exhaust bandage [new] in my shed so decided to bandage up the boost hose for the IC
    maybe it will keep the incoming temps to the IC down a bit.
    Held it in place with some stainless steel "cable ties"

    @ mudski cause of my set up I dont think it will hit limp mode,
    Last edited by threedogs; 14th March 2015 at 12:21 PM.
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  10. #37
    The master farter mudski's Avatar
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    HPD maf housing dont come with a maf.... Your current setup John, don't bother with the Larger maf housing. You wont achieve anything apart from wasted time. Just concentrate on the pipe to the turbo.

  11. #38
    Patrol God threedogs's Avatar
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    If I can incorperate an OE MAF into a larger diameter Pipe it should do the same as the HPD unit.
    I have two options one is 63mm back to the OE MAF which is easy enough to do.
    Option 2 is new lid and run 3" and reduce to 63mm at the turbo end,with the MAF in the 3" pipe
    What the heck I'll do both and see what makes the difference if any
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  12. #39
    Patrol God threedogs's Avatar
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    http://www.ebay.com.au/itm/301560290...%3AMEBIDX%3AIT

    This mesh looks very restrictive on the OE air box lid [see link], plus I think there is another on the MAF housing
    removing that would allow heaps more air in.
    Last edited by threedogs; 15th March 2015 at 07:24 AM.
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  13. #40
    Patrol Guru paulyg's Avatar
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    I have removed those mesh screens and I have a HPD maf housing, it does what they claim.
    But remember it will lower your maf voltage a little bit, so you may loose performance if you don't retune.
    2010 TB4.8, 5 speed auto TI Wagon, Beaudesert ceramic coated Extractors and 2 1/2 inch exhaust, 3inch lift, BP-51 shocks, Black hawk radius arms and drop boxes, Road Runner Offroad billet alloy draglink, Boss air bags, 295/70/17 KM3s, Redarc Gauges, GME XRS UHF, Autometre fuel gauge, Alpine head unit with offroad maps, Carbon winch, Opposite lock bull bar, Light Force Strikers, Safari Snorkel, Duel long range tanks, work in progress.

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