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Anyone have any experience installing a Vortec SC w/ Intercooler on a 308/328?

Discussion in 'Technical Q&A' started by gino, Jun 9, 2004.

  1. gino

    gino Rookie

    Nov 4, 2003
    2
    Just trying to gesstamate hp numbers, cost and possible headaches. Obviously the throttle body and ignition would have to be updated. It would appear to be slightly less labor intensive than a screw or roots type.

    Thank you
    Gino
    Catania, Sicily
     
  2. mk e

    mk e F1 World Champ

    Oct 31, 2003
    11,505
    The twilight zone
    Full Name:
    The Butcher
    I can send you a spreadsheet that will estimate hp at boost if you want it, shoot me a PM or email with your email address.

    You should be able to make about 350 hp without any intercooler and maybe 450 with a good one. Any more and you will need to replace valve springs at the very least...and a better clutch would be a good idea. The fuel injection system should go and be replaced with EFI (which will also run your ignition). Plan on $6k-$8k in parts and add $1k if you intercool.

    Honestly I don't think installing it will be any easier than a screw or roots type and they really are not as good. Basically you end up with the worst of both worlds between turbocharging and supercharging, a very narrow power band. A paxton would be a much better choice although still not as good as a positive displacement type supercharger.

    Intercooling is tough with a midengine car. An air/air unit is better than nothing, but it won't do an awful lot because there just isn't much air flow in the engine bay. A water/air intercooler with a heat exchanger mounted up front works much better, but is a lot more work to install.

    .
     
  3. mk e

    mk e F1 World Champ

    Oct 31, 2003
    11,505
    The twilight zone
    Full Name:
    The Butcher
    A procharger is a centrifugal just like a vortex and has the same fundamentally problem*a centrifugal compressor has an exponential flow curve. A piston engine is a positive displacement pump and has a linear flow curve. When you try to put a centrifugal supercharger on a piston engine, you get a very non-linear boost curve because of the mismatch in flow characteristics. If you put a positive displacement supercharger on you get a nearly flat boost curve with almost full boost available form idle through redline. Paxton at least uses a viscous drive so the compressor slips at a given boost, that lets them bring their boost in a little sooner without worrying about overboosting*but it's still not nearly as good for street use as a roots or screw type. That is the reason that the only superchargers used as OEM equipment are roots and screw, they just work a lot better. None of the major superchargers makers (vortex, procharger, Paxton, lysholm (whipple), eaton, autorotor) require an oil to be use on most applications*.very high rpm only (over 13000 for lysholm).
     

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