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Thread: The REAL Airbox Mod

  1. #1
    Regular Member Jezzy's Avatar
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    Default The REAL Airbox Mod

    Not for me the idea of taking out half the trumpet and saying I've gained 30 BHP at a stroke , a better idea would be to add another air intake to the airbox, especially useful given that my 2.0T has been remapped.

    The first thing I considered using was 32mm plumbing waste pipe fittings, so I bought a couple of metres of pipe and enough elbows and angled joints to start WWIII, but soon realised it was all too bulky and the pipe just wouldn't be able to wend it's way past all the hoses, cables and A/C plumbing that blocked the route from the grill to airbox. Even if I could find a convoluted route, the only way it would have been able to connect to the airbox would have been from the front side, where it would have made it impossible to change any of the O/S headlight bulbs in the future.

    Then, whilst idly looking through a hardware store I happened upon some flexible plastic pipe. Not a hose, which could kink, but an expandable pipe that can be bent in any direction and stays that shape, and it even looked the right length. If I was the patient sort I would have gone on the net and tracked down a black version, but I'm not so I bought it there and then, for the princely sum of £3.50.

    The first thing to do was to remove the airbox and cut a hole in the corner which is nearest the grill, making sure the hole is such that the flexible pipe is a very tight fit.








    Next, remove the pipe again so that the airbox can be refitted to the car, (there was no chance of the airbox going back in with the pipe still attached). Then, try to refit the pipe once the airbox is back in place. Then swear and kick some things when you see how awkward it is to manouvre the pipe into place and force the end into the hole that you purposefully made stupidly tight. After 10 minutes of trying, I realised that I had to try and move a lifting bracket on the engine that was in the way, but after undoing the bracket's bolt three quarters of the way, the head of the bolt was hitting the engine mount and wouldn't undo any further - clearly the bracket was bolted on before the engine lowered into the car. With the bolt loose, I was able to twist the bracket out of the way somewhat, which helped.

    With the pipe fitted to the airbox, it was just a case of stretching it to the right length so that it wends snugly to the grill and sits beside the existing air inlet.








    I haven't been for a test drive yet, as I forgot to fill up with petrol yesterday or today, so that will wait until tomorrow; but with the engine idling I could feel the air being sucked in through the new intake . In the morning I'll try and find out if it makes a difference.

  2. #2
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    thought about this before, i wonder if there's room for some 50mm tubing as i have some of that knocking around somewhere, nice work!

  3. #3
    Full Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    interesting, i am playing with a few pipes to do a similar thing..
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



  4. #4
    Regular Member RobW's Avatar
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    Default

    Looks good, and would it be right to say about 20% more air, judging by the size?

    How is it going to stand the heat?

  5. #5
    Regular Member Jezzy's Avatar
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    Default

    Quote Originally Posted by RobW View Post
    Looks good, and would it be right to say about 20% more air, judging by the size?

    How is it going to stand the heat?
    Yes, I'm estimating 25% more air, i.e. the original pipe looks about four times the size.

    I don't think the pipe will deform or anything from the heat, as it doesn't touch the block or head etc. There's a strong school of thought that says the inlet pipe(s) must avoid any warm areas of the engine - cooler air is denser etc etc. But, apparently on some very modern cars, manufacturers are starting to run the air inlets past the turbo, so that the air entering the engine is warm, which allows the engine to warm up more quickly and lowers emissions and fuel consumption. In a nutshell, as there's no one right answer, I decided to ignore the whole issue.

  6. #6
    Vectra-C Extreme Poster Big Red's Avatar
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    Alright fella good idea that was thinking could you not attach a cone to the end of the pipe to make a bigger area in which to scoop the air into the hose?

  7. #7
    Regular Member R2XPT's Avatar
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    Default

    That pipe is tiny, get a huge one routed on

  8. #8
    Regular Member Jezzy's Avatar
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    It's an addition - I'm not running the engine just on the new pipe...lol

  9. #9
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    Default

    the oe pipe does not face the grill be better if it pickrd up direct from facing grill

  10. #10
    Regular Member Reevo's Avatar
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    Default

    As said, what about making a scoop/funnel so its more ram air effect?

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