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Thread: Swiss Trackday Nova

  1. #411
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    Quick summary of what has been done over last couple of weeks and what im currently working on.

    During the last trackday i noticed a slight loss in power, no acceleration beyond 5500rpm and top speed about 180kph
    So i tore the engine apart to find the cause(s)

    Various boost leaks at different spots.
    Intercooler to throttle body...


    Blow off valve gasket


    Broken and bent hoses


    Replaced all these and a couple of other stuff in order to get all the boost to the cylinders.

    While having everything disassembled i removed the recirculation of the factory blow off valve and modified it slightly to give me the distinctive turbo blow off sound while shifting gears



    To get better cooling in the engine bay i've relieved to bumper of some unnecessary plastic






    And started working on a rear diffuser




    Ground clearance about 45mm





    As i am not frequently updating this thread there might be someone interessted to follow me on instagram. I've started the account especially for small and fast updates without writing a lot. That doesn't mean that i will abandon this thread. It should be more an easy way to keep the ones informed who are interested in it.
    So if you feel inclined: https://www.instagram.com/corsagsti/

  2. #412
    Go low or Go home. Moderator Benn's Avatar
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    Love the diffuser
    All I wanted was a Pepsi, just one Pepsi
    Far from suicidal
    Still I get them tendencies
    Bringing back them memories
    That I really miss when I reminisce

  3. #413
    Senior User Iain's Avatar
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    Following on Instagram! Diffuser is cool, although will less air flowing over the engine cause any heat issues?

  4. #414
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    It's even worse than just a diffuser, it's got a fully flat floor now. I'm a bit worried myself as well of the engine overheating, that's why i cut the vents into the rear bumper to help flow some air through the enginebay. I designed the mounting points for the diffuser as low as possible just in case it will lead to overheating and the diffuser needs to be quickly removed, no jacking up required.

  5. #415
    Club Member Club Member Jonesfach's Avatar
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    Quote Originally Posted by Iain View Post
    Following on Instagram! Diffuser is cool, although will less air flowing over the engine cause any heat issues?
    Wont it push the air up towards the engine and push out through the vents recently cut in the bumper?

    Thus more air flow over engine cooling it? Ie velocity of the air is more as it becomes slightly compressed.

    or am I talking rubbish

  6. #416
    Senior User Iain's Avatar
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    Quote Originally Posted by Jonesfach View Post
    Wont it push the air up towards the engine and push out through the vents recently cut in the bumper?

    Thus more air flow over engine cooling it? Ie velocity of the air is more as it becomes slightly compressed.

    or am I talking rubbish
    Diffusers accelerate air from underneath the car generating downforce. With a fully flat floor the air won't be getting on top of it at all.

  7. #417
    Club Member Club Member novarally's Avatar
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    ExTrEmeOc

    Hi - I would be very interested in talking to you about the rear arches/track width of your Nova/Corsa please.

    Hope to hear from you soon.

    Colin
    To contact me please use E-MAIL to colinesmith@aol.com.

    thousands of Nova (plus other Vauxhall and motorsport parts) available.

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