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Thread: Super cheap and easy performance increase!

  1. #1
    Join Date
    Dec 2021
    Location
    Australia
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    6

    Super cheap and easy performance increase!

    Pending a professional tune and installation of a watermist injection system into my D4 TDV8, I came across this little video just the other day;

    The truth about water injection in modern engines | Auto Expert John Cadogan - YouTube

    Apparently, you can get a significant power and efficiency boost by simply spraying water on your intercooler... I thought nothing more of it, but remembered it because it was interesting.

    Then just this morning, I noticed that the windscreen washers were plumbed back up the wrong way around (after the V8 install). So while I was down in the wheel arch I noticed something interesting... both my windscreen washer pump, and my headlight washer pump are identical. Which means for some reason in my disco, there is a seperate relay circuit for left and right headlight washers.

    So I found the relay under the bonnet, and used a bridge to test my theory. And guess what I found out? If you bridge the wrong circuit (positive to positive) you blow a 30A fuse! But if you replace the fuse, and actually look at the disgram on the relay to bridge the right circuits, one will squirt the left headlight, and the other the right...

    So this had me thinking... I could plumb both headlight washers into a common line from one side of the pump. Then plumb a garden irrigation spray system to spray onto the radiators and intercooler from the other side of the pump. Then manually install a 3 way toggle switch into the relay. One side of the toggle will wash my headlights, and the other side of the toggle will cool my intercooler, giving me that cheap, easy, and safe performance boost.

    Its worth a try and a play around, so I'm heading down to the hardware store this afternoon and will give it a whirl.

    Stay tuned for install and results.

  2. #2
    Join Date
    Aug 2009
    Location
    ACT
    Posts
    132
    Perhaps you could add one of Automobile Gauges : Auber Instruments, Inc., Temperature control solutions for home and industry EGT gauges which have a switched output that could turn on your sprayers when the intake / exhaust hits a certain temp.

    Might take your performance mod out of the super cheap category though!

    Most of my own projects start in the 'this won't be too expensive' but end in the 'hide the receipts' category

    For instance, this sounds like a fun project, and I have some left over irrigation fittings and an Auberin EGT gauge. And my Isuzu 120 does have an aftermarket turbo. But sadly no intercooler. And the easiest place for the intercooler to go would be to replace the crossover tube, so probably will need a puma bonnet to fit that. My spare tyre sits on the bonnet, so will need a roof rack to relocate it. It's a wolf rim with a 255/85 muddie on it so better buy an alloy if I'm to have any hope of lifting it onto said roof rack. Also, windscreen washer pump is broken. Plus its tank is small. I do have a 120l water tank under the tray with a pressure pump so maybe I could plump that up? 'Course, I'd need a solenoid then too. So, where are we? Intercooler+puma bonnet+roof rack+alloy rim+solenoid=

  3. #3
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    26,757
    The downside I see from this is the loss of the boot space for the 100l water tank!
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  4. #4
    Join Date
    Aug 2009
    Location
    ACT
    Posts
    132
    John, you missed the "under the tray" bit . Does eat into my GVM though!

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