Various F40 Exhaust setups and sound db levels...thoughts ? | FerrariChat
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Various F40 Exhaust setups and sound db levels...thoughts ?

Discussion in '288GTO/F40/F50/Enzo/LaFerrari/F80' started by RufMD, Jan 27, 2010.

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  1. RufMD

    RufMD F1 Rookie
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    #1 RufMD, Jan 27, 2010
    Would like to get some input here on various F40 exhaust setups for a planned track day.

    The noise limitation is 103 db at 60 feet.

    I would like to get some feedback on whether 103db would be exceeded with the following setups.

    1) Stock Exhaust

    2) Cats + Tubi Muffler

    3) Cats + Straight pipe (tubi LM pipes)

    4) no Cats + straight pipe


    Track is Laguna Seca...:)

    Any thoughts and opinions are appreciated !
     
  2. Bas

    Bas Four Time F1 World Champ

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    #2 Bas, Jan 28, 2010
    one of these might help...

    http://www.hksusa.com/products/?id=1651

    It's en electronic valve in the exhaust witch opens/closes via a button in the cockpit...Will reduce the noise level sufficiently in pretty much all cases. Try it with open straight pipes first and if they moan close them:)
     
  3. TSOL

    TSOL Karting

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    #3 TSOL, Jan 28, 2010
    I can't speak to the db levels, however I believe there are a few Iphone apps that allow you to measure decibel levels. Might be worth figuring out how loud your current set up is and/or finding another F40 with a different setup to measure.
     
  4. joe sackey

    joe sackey Five Time F1 World Champ
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    #4 joe sackey, Jan 28, 2010
    I think the clarification might be that the aforementioned decibel value is one at 'open throttle' and not idle?

    I'm afraid if you have 3 or 4 you might want to get it measured. Plenty of time to do so, and might be a fun exercise to know.
     
  5. SupercarGuru

    SupercarGuru F1 Rookie
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    #5 SupercarGuru, Jan 28, 2010
    Jas,

    As you know, my father was a Tubi dealer before the company changed hands.

    He installed all three setups.

    I am no sound expert but have been around enough cars that exceeded Florida State 98 decibel law. : )

    Setup number 4 Tubi Straight with No Cats will be too loud and personally it is not a pretty tone, very aggressive.

    Setup number 2 is my personal favorite as you can still hear the Turbos and it is not too loud, but a much more appealing tone.

    Without having a decibel meter I would say that Setup 3 at speeds would go over the limit for LS.

    Just my personal experience.
     
  6. Murcielago_Boy

    Murcielago_Boy Formula Junior

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    #6 Murcielago_Boy, Jan 28, 2010
    Jas, I cannot comment on volume, but I will say that the cats on the F40 should be removed - there's a lot of power to be gained for not much money... Tubi UK should be able to advise.
     
  7. Driftracer3

    Driftracer3 Formula Junior

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    #7 Driftracer3, Jan 28, 2010
    Use Hyperflow cats and an aftermarket muffler. That should be within the acceptable range.
     
  8. RufMD

    RufMD F1 Rookie
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    #8 RufMD, Jan 28, 2010
    Various strategies :))) exist to conform to noise reg limitations of 103db. One involves a simple bolt on tip that directs exhaust down...looking for a simple solution for those exhausts that might not conform without changing mufflers etc.
     
  9. cmparrenzo

    cmparrenzo F1 Rookie

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    #9 cmparrenzo, Jan 28, 2010
    When I was at Laguna I was hitting 111 dec with Tubi straight and no cats, kicked off the track.

    I put on Tubi Sport Muffler no cats, was hitting 107, kicked off the track.

    I went back out and just learned to soft pedal between turn 5 and 6.... good luck!

    (Rob Lay was pitted next to me with his 355 Challenge car, never could make that quiet enough)
     
  10. RufMD

    RufMD F1 Rookie
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    #10 RufMD, Jan 28, 2010
    Thanks Chris, definitely need to be judicious between 5 + 6. I'm hopeful that at the very least, cats and LM pipes might pass with some on track "care taken".
     

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