Exhaust Pressure on 308 | FerrariChat
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Exhaust Pressure on 308

Discussion in '308/328' started by kemullins63, Mar 31, 2010.

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  1. kemullins63

    kemullins63 Karting

    Feb 12, 2010
    78
    Kansas City Missouri
    Full Name:
    Kirk
    #1 kemullins63, Mar 31, 2010
    I have a question/concern... I have an 81 US version 308 GTSi 2V car, if I put my hand up to the exhaust tips while the car is running, I feel a nice pulsing pressure from the right exhaust, but very little pressure from the left. Shouldn't they feel the same? Also when cold starting, the left side emits a lot of steam until the engine has warmed up. What's going on here? Is it a bad cat? The car runs good.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,842
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Mar 31, 2010
    Last edited: Mar 31, 2010
    If you have the stock muffler = no (the stock muffler is not symmetric inside and shares a common chamber).

    If you have an aftermarket muffler with completely separate, and identical, chambers for each bank = yes.
     
  3. kemullins63

    kemullins63 Karting

    Feb 12, 2010
    78
    Kansas City Missouri
    Full Name:
    Kirk
    #3 kemullins63, Mar 31, 2010
    My muffler is stock, so it shouldn't concern me the pressure isn't equal?
     
  4. CarreraScott

    CarreraScott Formula Junior

    Jan 30, 2004
    592
    Charlottesville, VA
    #4 CarreraScott, Mar 31, 2010
    My 1980 gtsi is just like that. Just recently had a major done and everything is running great. I wondered that too, but it seems it's normal.
     
  5. ME308

    ME308 Formula 3

    Nov 5, 2003
    1,550
    Munich, Germany
    Full Name:
    Michael
    #5 ME308, Mar 31, 2010
    No ;)

    (same car here, same symptons with stock mufler...)
     
  6. Tony K

    Tony K Formula 3

    Jun 7, 2006
    1,779
    USA
    Full Name:
    Tony K.
    #6 Tony K, Mar 31, 2010
    Just to be redundant:


    The uneven pressure on the stock muffler is perfectly normal. :)
     
  7. mwr4440

    mwr4440 Five Time F1 World Champ
    Rossa Subscribed

    Jun 8, 2007
    57,982
    Bavaria, The 'Other' Germany
    Full Name:
    Mark W.R.
    #7 mwr4440, Apr 1, 2010
    Mine (OEM muffler) too. Same- Same.
     
  8. kemullins63

    kemullins63 Karting

    Feb 12, 2010
    78
    Kansas City Missouri
    Full Name:
    Kirk
    #8 kemullins63, Apr 1, 2010
    Ok... thanks guys, it just seemed odd to me :)
     
  9. canadiantifosi

    canadiantifosi Formula Junior

    Jul 2, 2008
    919
    uh...guess...
    Full Name:
    Canadian Tifosi Sr.
    #9 canadiantifosi, Apr 1, 2011
    Last edited: Apr 1, 2011
    X
     
  10. Steve King

    Steve King F1 Rookie

    Feb 15, 2001
    4,367
    NY
    #10 Steve King, Apr 2, 2011
    For those with Ansa sport mufflers I have seen a cut away of an old muffler and the right side pipe is the 5-8 and the left side is 1-4. You can see in the picture that the 2 sides are separate. I don't know how this is configured in the stock exhaust. FYI
     

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