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SLP Lid Question

This is a discussion on SLP Lid Question within the Firebird / WS6 forums, part of the Vehicle Specific category; I tried searching for something about this but couldn't come up with anything. I installed my SLP Lid and smooth ...

  1. #1
    Junior Member thor2001TA's Avatar
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    SLP Lid Question

    I tried searching for something about this but couldn't come up with anything. I installed my SLP Lid and smooth bellow a couple months ago and i have noticed when i get up to 40-50 mph, i hear kind of a high pitch moan when i have the throttle open. As soon as i take my foot off the gas, the noise goes away and the noise will come right back if i give it gas. Is this the noise that would normally be covered up by the baffles or resonator or do i have another problem? I don't remember hearing the noise with the stock setup but I suppose it could have been droned out. I tried to listen for it while driving our other T/A but couldn't really hear it.

    This is my first mod so hopefully i didn't screw anything up. The install is pretty straightforward so I don't see how I could have missed something.

    Thanks in advance for any help or suggestions.

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    did you plug the air inlet on the drivers side of the lid?

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    Have not noticed anything like that with our car. Are your intake duct clamps snug so it is not sucking air and causing a noise issue?

  4. #4
    Junior Member thor2001TA's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    did you plug the air inlet on the drivers side of the lid?
    Yeah, i forgot to mention i have an 01 so it came with a rubber hose for the air inlet.

    Quote Originally Posted by pajeff02 View Post
    Have not noticed anything like that with our car. Are your intake duct clamps snug so it is not sucking air and causing a noise issue?
    I triple checked everything when I was done with the install and everything seemed snug. I'll check again when i get home.

  5. #5
    Member Nowhereman's Avatar
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    I think your picking up some air noise due to the increase in intake velocity.
    I went a different route than you.
    I pulled the MAF screen, trimmed out the vanes in the stock lid, opened up the filter structure to allow more area to draw air.
    It's pulling much more air now than before.
    I got a nice increase in torque you could feel and some intake noise. (not bad, just a little more)
    It's drawing more air now so you will hear some resonance.
    Be who you are and say what you feel 'cause people who mind don't matter, and people who matter don't mind.'
    -Nowhereman

  6. #6
    Senior Member justinmc978's Avatar
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    sold: 1999 firebird
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    not sure about some of the others here, but my SLP lid, like all SLP products needed some fine tuning, there was a space in the back that wasnt air tight and allowed said air to 'bypass' the filter element, I bought some tack on weather strip from Oreillys and layed it all the way around the inside of the lid.

    mine never made a noise when it was leaking, but I just though I'd put it out there.

  7. #7
    Spaz is My Mentor SMWS6TA's Avatar
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    also the front lip needs to be tuck inside the bottom tray not outside

  8. #8
    Former Mopar Man 2002ssslp's Avatar
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  9. #9
    024mula 024mula's Avatar
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    I use to have the same problem with my car, then I asked my mother-in-law to get out of the car and the noise stoped.

    I'm sorry!

    I just had to say that, I hope you find an answer for your problem.
    Last edited by 024mula; 09-14-2011 at 04:48 PM.
    BLK2KSS likes this.

  10. #10
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    Quote Originally Posted by Nowhereman View Post
    I think your picking up some air noise due to the increase in intake velocity.
    I went a different route than you.
    I pulled the MAF screen, trimmed out the vanes in the stock lid, opened up the filter structure to allow more area to draw air.
    It's pulling much more air now than before.
    I got a nice increase in torque you could feel and some intake noise. (not bad, just a little more)
    It's drawing more air now so you will hear some resonance.

    Nooooooooooo. The stock MAF will feed an engine up to 500 hp without any issues. The MAF is a calibrated air measuring device and when you modify it you alter its ability to accurately measure the airflow into the engine. The MAF operates by heating up a tiny wire to a set temperature. By measuring how much current is required to maintain the temperature, the PCM is able to read the signal from the MAF and adjust fueling for the amount of air entering the engine. By modifying the MAF, you are allowing unmetered air to enter the engine and it is probably running lean, may have a stumble in the rev range, and your fuel trims are going to be off kilter.

  11. #11
    Member Nowhereman's Avatar
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    Naah, it runs like a top.
    That screen is not a requirement for safe performance.
    Take a look at the Vette, no screen...
    Ya can't be half pregnant.

  12. #12
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    I don't make this stuff up. If I recall correctly from Greg Banish's tuning literature, removing the screen adversly affects the MAF's output by 5-8%. The goal is to achieve the proper air-fuel mixture in the combustion chamber, and if the PCM is getting a false air reading it can not do that. Having said this, you can tune for an altered MAF provided the modifications have not affected its ability to be consistent in its readings. What are your trims running at?

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    Member Nowhereman's Avatar
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    Quote Originally Posted by 024mula View Post
    I use to have the same problem with my car, then I asked my mother-in-law to get out of the car and the noise stoped.

    I'm sorry!

    I just had to say that, I hope you find an answer for your problem.
    Now THAT was funny LOL

  14. #14
    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by thor2001TA View Post
    I tried searching for something about this but couldn't come up with anything. I installed my SLP Lid and smooth bellow a couple months ago and i have noticed when i get up to 40-50 mph, i hear kind of a high pitch moan when i have the throttle open. As soon as i take my foot off the gas, the noise goes away and the noise will come right back if i give it gas. Is this the noise that would normally be covered up by the baffles or resonator or do i have another problem? I don't remember hearing the noise with the stock setup but I suppose it could have been droned out. I tried to listen for it while driving our other T/A but couldn't really hear it.

    This is my first mod so hopefully i didn't screw anything up. The install is pretty straightforward so I don't see how I could have missed something.

    Thanks in advance for any help or suggestions.
    How long ago did you by the lid? I bought my SLP lid in July and it came with a peice of foam weatherstipping to be put on the rear of the base where the lid would make contact. Apparantly there is a gap unless thie strip is put in.

    Also, the center portion of the lid needs to go on the inside of the base, and the outer portion of the lid needs to go on the outside of the baselike this : correct.jpg

  15. #15
    Junior Member thor2001TA's Avatar
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    Quote Originally Posted by Whamhammer View Post
    How long ago did you by the lid? I bought my SLP lid in July and it came with a peice of foam weatherstipping to be put on the rear of the base where the lid would make contact. Apparantly there is a gap unless thie strip is put in.

    Also, the center portion of the lid needs to go on the inside of the base, and the outer portion of the lid needs to go on the outside of the baselike this : Click image for larger version. 

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    I bought mine in July too I believe. I bought it used and the weatherstripping was already there.

    Here's a pic of my lid. I think it looks correct other than the fit not being perfect. I know that is an issue with these but I think it fits pretty good.



    Like somebody said earlier i'm probably hearing the sound because i am drawing more air now and also because the baffles and resonator are no longer there to muffle the noise. I just wasn't expecting to hear that kind of sound, that's all.

    BTW, thanks to all who chimed in. You were very helpful.

  16. #16
    Senior Member REVNORR82's Avatar
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    i have the same set up and get that moan every once in a while i just turn the radio up or go faster seems to work for me.

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