QV Engine & Gearbox inspection and preparation for efi | Page 3 | FerrariChat
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QV Engine & Gearbox inspection and preparation for efi

Discussion in '308/328' started by pshoejberg, Apr 26, 2025.

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  1. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,853
    The twilight zone
    Full Name:
    Help me get this thing finished! https://gofund.me/39def36c
    #51 mk e, Oct 26, 2025 at 5:55 PM
    Everything looks great!

    .2mm sounds fine, my cams suggested .006/.008" or .15/.2 for int/exh. Excess clearance, meaning in the acceleration ramp causes things bang a bit. Too tight and the valves don't close fully would be the concern but many here have used CatCams with no reports of issues I've seem so I really thing it will be fine
     
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  2. pshoejberg

    pshoejberg Formula 3
    Silver Subscribed

    Dec 22, 2007
    1,880
    Denmark
    Full Name:
    Peter H
    #52 pshoejberg, Oct 27, 2025 at 1:29 AM
    Thanks Mark. Your input is much appreciated. I will plan to adjust all clearances to fit the new cam spec.

    Best, Peter
     
  3. Ferraripilot

    Ferraripilot F1 World Champ
    Owner Project Master

    May 10, 2006
    17,968
    Atlanta
    Full Name:
    John!
    #53 Ferraripilot, Oct 27, 2025 at 7:43 AM
    Looking really good Peter! This will be a great and reliable engine. "just enough"
     
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  4. aventari

    aventari Karting

    Dec 9, 2010
    189
    San Diego
    #54 aventari, Oct 27, 2025 at 5:20 PM
    This is great! I don't have experience with a 308, but I converted my Jetronic injected VW Scirocco to Megasquirt and added a turbocharger, so I might be able to help with the standalone stuff.

    What injectors did you get?

    I took a similar path to what was suggested for the tables. For ignition there were ignition curves in the factory manual with spark vs RPM and also the vacuum advance/retard tables. I was able to translate those to a table. I didn't use a trigger wheel, I locked my stock distributor and used that. Your trigger wheel is a better option.

    And fuel is a lot easier, just take a similar existing map and get the car running, and then use a good quality wide band to tune it from there. Throttle enrichment is probably the hardest part to get right here.
     
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