In the SSOA FAQ it says that the screens create less turbulent air flow and should not be removed unless you are doing a mod on the heads, cam, etc... This does not make sense to me. It seems to me that the screens would be blocking airflow. And anytime you put an obstruction in the way of air the air will become more turbulent.

I have never heard anyone say that they would not do this mod or that it would adversly effect performance. In fact I've seen the opposite... Claims that there is improved midrange (makes sense, more flow more top end and midrange power) and better throttle response.

I still have my screen in my MAF.

Look at it this way, your faucet has a screen on it to keep the water flow straight and nice (lack of better terms mind you.) remove that little screen and the water goes everywhere. Its not just a nice smooth flow anymore.

But, seeing as I am not a professional, this is only my opinion. My broh Chab has his screen removed (I think) and it has a slight irratic idle. (its slowly going away after the PCM program)

Good analogy with the faucet though. But I bet if you measured and timed the water coming out of the faucet you would find you get more cfm as well.

And with all the other things the air has to pass through after the MAF it would seem to me that the turbulence would be a very very minor factor.

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Originally posted by AndrewB:
There are two reasons why it's there. One is to straightened the air flow (this is documented in GM in documents). Two, as a last ditch barrier to prevent large crap from visiting your engine (GM knows they build shit airboxes, so a little more security wont hurt).

We pulled the screen on my friends 97 WS6 and he has had no problems. It's always a good idea after any mod to pull the battery and have the ECM re-learn things.

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Thanks, that sounds reasonable. I'm going to be installing the SLP !CAI (if SLPonline is back up for me to order it, heheh) and at the same time I'm going to try the screen mod. I'll let you all know how it turns out. I'll take your advise and disconnect the battery as well.

Removing the MAF Screen provides an additional 170-180 CFM of flow (the stock MAF flows in thousands). It also allows 'rougher' air to hit the sensor. That 'rough' air causes the sensor to send irradic data to the computer which must then try to figure out what the correct flow should be, so it can adjust the fuel to air ratio. usually the computer fails to get the right mixture and makes it to rich in fuel. which is why people see decreased fuel mialage.

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Originally posted by John -- '01 HAWK:
the MAF screen provides laminear (sp?) flow to the sensor. Essentially it straightens out the air flow hitting the sensor. which allows the sensor to report an even reading to the computer.

Removing the MAF Screen provides an additional 170-180 CFM of flow (the stock MAF flows in thousands). It also allows 'rougher' air to hit the sensor. That 'rough' air causes the sensor to send irradic data to the computer which must then try to figure out what the correct flow should be, so it can adjust the fuel to air ratio. usually the computer fails to get the right mixture and makes it to rich in fuel. which is why people see decreased fuel mialage.

One thing I've never seen is anybody actually prove with dyno runs, and track runs that thers any performance gain after 200 miles. The ony thing I've seen is people talking about SOTP feeling which makes me beleive that the SOTP performance thier feeling is mental.

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I will say that the combination of the Whisper lid and the MAF ends did seem to open up the top end of the engine a little. After I put on my exhaust, it seemed to get even better.

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Originally posted by Kuma:
There must be something to removing the screen. Have you noticed that ALL the so called HiPro after market MAF's have no screens?

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I forgot to add that I'm talking about the ls1. The lt1 behaves just a little bit differnt to the MAF scrren removal

They also include sensors that have been recalibrated. GMS MAF is an excellent example, they've removed the Screen and then they calibrate every unit. Even then the MAF has problems on most the cars its installed on it either makes the car run to lean on some occasions to rich. So you can send it back to GMS and they'll recalibrate it again.

The MAF ends keep the stock sensor, some even have same I.D as the stock. Fot the ones that keep the same ID, I haven't seen any proof of performance.

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Originally posted by John -- '01 HAWK:
I forgot to add that I'm talking about the ls1. The lt1 behaves just a little bit differnt to the MAF scrren removal

They also include sensors that have been recalibrated. GMS MAF is an excellent example, they've removed the Screen and then they calibrate every unit. Even then the MAF has problems on most the cars its installed on it either makes the car run to lean on some occasions to rich. So you can send it back to GMS and they'll recalibrate it again.

The MAF ends keep the stock sensor, some even have same I.D as the stock. Fot the ones that keep the same ID, I haven't seen any proof of performance.

BTW the SLP 85mm MAF has a screen.

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The stock MAF flows enough for the engine to operate normally, the really congestion is exhaust. I would look at that route before I did the MAF

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Originally posted by John -- '01 HAWK:
That report is BS. The car got that much in gains because it had other work (Headers, etc) done to it they forgot to mention. Similiar to what what happened on the SLP long tube headers.

The stock MAF flows enough for the engine to operate normally, the really congestion is exhaust. I would look at that route before I did the MAF

Also I would go with maf ends if you aren't going to headers, or head work. Ask KenC about his MAF ends.

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Thus for the mods they had they got that 20hp when the maf was installed. It's not deceptive because it's what the magazine printed. none of the data is GMS's its all the mags. very easy to pass the buck