What's the Purpose of the MAF Screen?
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Joined: Jan 2002
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From: Earth
Re: What's the Purpose of the MAF Screen? The MAF screen is supposed straighten out the air flow. It's not meant to catch debris. I think it's a bunch of <img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> myself. I removed mine and I gained 19rwhp.
TECH Fanatic
Joined: Nov 2001
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From: Las Cruces, NM
Re: What's the Purpose of the MAF Screen? The screen reduces turbulance, when turbulance is reduced the maf is more accurate. If you remove the screen the maf is less accurate and reads less air flow than is actually flowing into the engine. Less air flow means less fuel, and engine leans out which produces more power (sometimes). This is a bad idea for Forced induction, Nitrous or people running on the edge.
Gary
<small>[ July 04, 2002, 10:11 AM: Message edited by: red ws6 99 ]</small>
Gary
<small>[ July 04, 2002, 10:11 AM: Message edited by: red ws6 99 ]</small>
Administrator
Joined: Jan 2002
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From: Earth
Re: What's the Purpose of the MAF Screen? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> The screen reduces turbulance, when turbulance is reduced the maf is more accurate. If you remove the screen the maf is less accurate and reads less air flow than is actually flowing into the engine. Less air flow means less fuel, and engine leans out which produces more power (sometimes). This is a bad idea for Forced induction, Nitrous or people running on the edge.
Gary </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ya, what he said. That's a much better explanation. My car was running very rich. It leaned it out a lot once it was removed.
Gary </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ya, what he said. That's a much better explanation. My car was running very rich. It leaned it out a lot once it was removed.
Re: What's the Purpose of the MAF Screen? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">To take away HP.Notice the new vettes dont have them. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Well, its not really there to take away hp although it may do that in some cases <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Gary is right on as far as the "screen" is concerned - its there to help create laminar airflow (i.e. reduce turbulence). The "screen" was deemed unnecessary with the 2002 ZO6 (not sure if its across the board with the C5's) since the MAF sits in an area with a straight shot from the airbox. They were more concerned with getting the additional air to the engine.
Gary is right on as far as the "screen" is concerned - its there to help create laminar airflow (i.e. reduce turbulence). The "screen" was deemed unnecessary with the 2002 ZO6 (not sure if its across the board with the C5's) since the MAF sits in an area with a straight shot from the airbox. They were more concerned with getting the additional air to the engine.
Staging Lane
Joined: Dec 2001
Posts: 90
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From: San Clemente, CA
Re: What's the Purpose of the MAF Screen? Hi,
The MAF determines the mass flow of the air going into the engine by looking at how much the incoming air cools a heated wire. The cooling effect is a function of the velocity of the air. If you have a bend in your intake duct the velocity will not be uniform across the duct. The air flows to the outside of the bend. If the wire is in a low velocity part of the duct it will read a lower mass flow then with a uniform flow.
The screen is in the intake duct to even out the velocity profile before the air goes over the hot wire. It does this by adding a pressure drop that will slow the fast air more then it will the slow air. If you have a well-shaped, straight intake duct the screen is not needed because you will already have a uniform velocity.
The story I have heard about the Chevy MAF is that the engineers expected to see a non-uniform flow in some applications, like the trucks. When they were looking for ways to get 400hp for the 2002 ZO6, they actually measured the flow field in the Vette and found that the screen was not needed.
Removing the screen seems to make the LS engines run leaner which may, or may not help your tuning. The reduced pressure loss in the intake duct will always give a higher potential power.
Good luck with your project,
Steve
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
The MAF determines the mass flow of the air going into the engine by looking at how much the incoming air cools a heated wire. The cooling effect is a function of the velocity of the air. If you have a bend in your intake duct the velocity will not be uniform across the duct. The air flows to the outside of the bend. If the wire is in a low velocity part of the duct it will read a lower mass flow then with a uniform flow.
The screen is in the intake duct to even out the velocity profile before the air goes over the hot wire. It does this by adding a pressure drop that will slow the fast air more then it will the slow air. If you have a well-shaped, straight intake duct the screen is not needed because you will already have a uniform velocity.
The story I have heard about the Chevy MAF is that the engineers expected to see a non-uniform flow in some applications, like the trucks. When they were looking for ways to get 400hp for the 2002 ZO6, they actually measured the flow field in the Vette and found that the screen was not needed.
Removing the screen seems to make the LS engines run leaner which may, or may not help your tuning. The reduced pressure loss in the intake duct will always give a higher potential power.
Good luck with your project,
Steve
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
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Re: What's the Purpose of the MAF Screen? tell me a catback that will not make this awful noise. I have the SLP LT set up with the Y pipe no cats. Does the loudmouth have a deep tone or not? I have the original pipe with a flowmaster muffler and it sounds like ****.
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Joined: Jul 2002
Posts: 69
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From: El Paso
Re: What's the Purpose of the MAF Screen? tell me a catback that will not make this awful noise. I have the SLP LT set up with the Y pipe no cats. Does the loudmouth have a deep tone or not? I have the original pipe with a flowmaster muffler and it sounds like ****.
Staging Lane
Joined: Jul 2002
Posts: 69
Likes: 0
From: El Paso
Re: What's the Purpose of the MAF Screen? I have the LS6 intake manifold, SLP LT and I am wondering can I use another MAF with the HPP3 programming and not mess up my car. SLP's says for stock tuning only. Is it worth losing the HPP3 tuning for this product? Can someone help me with this. I also have the K&N filter system in my car. I am wondering if the SLP or Whisper Lid setup is better. My car inhales a lot of air with this system, but is there something better?
