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Variable Turbochargers

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  • Variable Turbochargers

    Here's a good article on the principal of operation for adjustable turbos.



    Pinched from the Aussie Caddy Forum.


    APR Tuned | KW Suspension | INA Engineering | Mocal Oil Control |
    Website: http://www.tprengineering.com
    Email: chris@tprengineering.com

  • #2
    All is revealed!

    So now I fully understand how it operates. Thanks, mate!
    It's worryingly complex though as there's a hell of a lot of moving parts in a pretty hostile environment. Makes you wonder about reliability/longevity. In addition, there's even more sensors and computers to malfunction if you're unlucky, and of course you'd need VAGCOM to pinpoint a fault. I once swore that if I couldn't fix it myself I wouldn't buy it, but here I am driving around in a Mk5 TDI
    Extended warranty is looking more appealing

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    • #3
      complexity

      they are getting a name for jamming up.

      its not hard to rig up a VNT in a car without any electronics though.

      on a normal turbine, you use the boost pressure to operate a diaphragm controlling the wastegate. on the VNT, you simply use the same diaphragm to actuate the vane control, set up for restriced outlet at no boost and unrestricted as the boost builds.

      there are an increasing number of guys putting VNT's on old 1.6TD's and AAZ (1.9TD) in the US. GTD forum has some info.
      '07 Touareg V6 TDI with air suspension
      '98 Mk3 Cabriolet 2.0 8V
      '99 A4 Quattro 1.8T

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