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456 dyno and service after poor running

Discussion in '456/550/575' started by Alexander฿, Mar 3, 2022.

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  1. Alexander฿

    Alexander฿ Rookie

    May 18, 2019
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    Full Name:
    A Mardenborough
    #1 Alexander฿, Mar 3, 2022
    Posting this as I was looking for something like this previously.

    95 456GT 6-1 Fia mmenghi manifold with sport cats Center muffler straight pipes. Stock everything else. Had poor running and needed a service too. Left bank running rich. To the point of black smoke. A jumper wire in a place where it shouldn't be.
    See attached files.
    Keeping for life and daily it.
     

    Attached Files:

    INTMD8 and paulchua like this.
  2. paulchua

    paulchua Cat Herder
    Lifetime Rossa Owner

    Jul 1, 2013
    16,387
    Menlo Park, CA
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    Paul Chua
    #2 paulchua, Mar 3, 2022
    Thanks for sharing, I assume that automatically added drivetrain loss adjustment? If so, do you know the multiplyer? If not - wow - awesome!
     
  3. Aerosurfer

    Aerosurfer Formula 3
    Silver Subscribed

    Nov 21, 2020
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    Indianapolis
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    Nick
    #3 Aerosurfer, Mar 3, 2022
    Did you document or post the process of fitting Fabio’s headers anywhere?

    perhaps a long term goal for own 95. Very impressive indeed
     
  4. Alexander฿

    Alexander฿ Rookie

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    #4 Alexander฿, Mar 3, 2022
    I don't if I find out i'll post here. I assume this is adjusted for drivetrain loss already
     
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  5. Alexander฿

    Alexander฿ Rookie

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    #5 Alexander฿, Mar 3, 2022
    Didn't but DK who did it removed the engine to fit! Can be done in with engine in however.
     
  6. F456M

    F456M F1 Rookie

    Jan 8, 2010
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    Erik
    #6 F456M, Mar 3, 2022
    Are you saying that you have 427 hp at only 5.300 rpm? (top of graph) I would assume 6.500-7.000 is more peak power rpm. on a 456?
     
  7. paulchua

    paulchua Cat Herder
    Lifetime Rossa Owner

    Jul 1, 2013
    16,387
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    Paul Chua
    #7 paulchua, Mar 3, 2022
    Cool, either way, very cool! Thanks for sharing!
     
  8. Alexander฿

    Alexander฿ Rookie

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    #8 Alexander฿, Mar 3, 2022
    That's peak torque at that RPM buddy.
     
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  9. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
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    Terry H Phillips
    #9 tazandjan, Mar 3, 2022
    The 456 and 456M both have wilder cams than the Maranellos to make hp at high revs without the dual length intake tract. The hp peak does seem to be at a much lower than expected rpm. That is also a boatload of torque, more than a 575M if the scale is lb-ft.
     
  10. F456M

    F456M F1 Rookie

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    Erik
    #10 F456M, Mar 3, 2022
    My 456M definately had more low end torque than my 550. Also lower rpms. in 6th. All in all, a better car for fast cruising. But not the same power on top (were you very seldom run the engine). But I would expect your 456 to give peak power at higher rpms.
     
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