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Anyone hear this..........

This is a discussion on Anyone hear this.......... within the General Help forums, part of the LSx Technical Help Section category; I have the slp lid and k & n filter and now I notice when I turn my car off ...

  1. #1
    Senior Member clg82's Avatar
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    2000 Trans Am

    Anyone hear this..........

    I have the slp lid and k & n filter and now I notice when I turn my car off as I am getting out it sounds like the intake is making a hissing sound, almost like it's BREATHING!!!! Is this just my car actually "breathing"? And is this a good thing?
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

  2. #2
    Member Kup98ss's Avatar
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    Arctic White
    2002 A4,WS6

    I just put mine on and I noticed no dif. in the start up or turning off of the car.

    could it be the AC?

  3. #3
    Member Lawnman's Avatar
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    lookin for a ws6

    No difference here.

  4. #4
    Member TACE02's Avatar
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    ASC #753
    2002 Collector's Edition

    it's Alive!!!

  5. #5
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Yes, you can hear the air being sucked through the intake. That is one of the things I loved about my 97 SS! It was loud!

  6. #6
    Bomb Technician Krazy351w's Avatar
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    hunter Green
    92 Camaro RS 350 Special

    Fuel pressure release?

  7. #7
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by Krazy351w View Post
    Fuel pressure release?
    What? Have you ever turned an engine over by hand with a breaker bar on the damper? Ever heard the sucking noise it makes?
    This is one of the issues with the factory intake with the silencer. It makes it tough for the LS1 to breath!

  8. #8
    Senior Member clg82's Avatar
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    2000 Trans Am

    Quote Originally Posted by 9t8z28 View Post
    What? Have you ever turned an engine over by hand with a breaker bar on the damper? Ever heard the sucking noise it makes?
    This is one of the issues with the factory intake with the silencer. It makes it tough for the LS1 to breath!
    So how do you make the ls1 breath better?!?!?

  9. #9
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by clg82 View Post
    So how do you make the ls1 breath better?!?!?
    You already have the mods to make it breath better (a.k.a. lid and filter)

  10. #10
    Member Rob00Taws6's Avatar
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    black
    2000 pontiac trans am

    ya know something, I just bought a 2000 trans am, traded in a 2000 corvette for the car, and it has a slp lid with a k&n filter, and it makes the same noise.

  11. #11
    This Light Dinner Is Over hamburger68's Avatar
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    Silver
    1998 Camaro Z28 A4

    yeah, you can also hear it when coasting at city speeds in a lower gear. makes that sucking sound when going through a certain rpm range.

  12. #12
    Member SSpdDmon's Avatar
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    SOM
    '01 Camaro SS

    I would guess you're hearing your HVAC system (e.g. A/C depressurizing)...

  13. #13
    Senior Member 02z28ls1's Avatar
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    navy blue
    2002 Z-28 Camaro M6

    As stated it's either the AC system equalizing pressures or the electric AIR pump winding down. The key here is the noise occurs after shut down. Unless he is jumping out of the car at superman like speed he won't hear the engine air intake still sucking air. The AIR pump is now heard much louder than before because of the lack of noise silencing that the stock set-up was mandated by Federal noise regulations to have. The A/C noise is normal in most any car as the high pressure side bleeds down into the low pressure side.

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