This is what GM has to say:
Mass Air Flow Sensor
The Mass Air Flow (MAF) sensor measures the amount of air which passes through it. The PCM uses this information to determine the operating condition of the engine, to control fuel delivery. A large quantity of air indicates acceleration. A small quantity of air indicates deceleration or idle.

Tell me, does GM have any thing to say about velocity?? The more air quantity is waht matters here but dont take my word for it- listen to the R&D people at GM

 

Physics 101. For a given amount of air flowing through a tube, the larger the opening the slower the air velocity. The same amount of air flowing through a smaller tube will have greater velocity.

If I made the MAF 5 inches in diameter and put 1000cfm of air through it the MAF wires would see airflow at 50 miles an hour and would be cooled by a certain amount. If I reduced the size of the MAF to 75mm( roughly 2 3/4" and ran 1000cfm of air through it the MAF wires would see airflow at 91 miles an hour and would be cooled much more.

Now, here's the tricky part. :rolleyes: GM R&D programmed a set of tables with values that are used to control the engine's A/F ratio, and spark advance retard. The PCM uses the MAF to gauge how much air is flowing past it, BUT THEY BUILT THE TABLES WITH THE STOCK MAF FLOW CHARACTERISTIC'S IN MIND. Change the flow characteristics of the MAF and you change the way the tables are indexed.

All I'm saying doesn't matter much. If your engine is running a little rich and you pull the screen off, then the MAF will think there is less air flowing through the MAF (lager opening, less velocity) and you won't get as much fuel for a given throttle position and you will run leaner. If you are running rich a little leaner would be a good thing, as long as you don't go too lean. :crazy: :crazy:
:smash: :smash:
:conehead :conehead

 

QUOTE;Physics 101. For a given amount of air flowing through a tube, the larger the opening the slower the air velocity. The same amount of air flowing through a smaller tube will have greater velocity.
It's not flowing through a tube, it's flowing through a quarter inch honeycomb! Yes it speeds up as it goes through it, BUT slows down long before it gets to the sensors. Also the sensors are on the righ hand side only, so next are ou gonna tell us that the screen has a ram air effect??!! This is an easy question that you make all to complicated. The more air you can get in to an engine the better it runs, would you agree?? WOuld you also agree that every engine that comes from the factory runs a little rich?? I say yes to both of them. If you had a 5 inch MAF with a screen in it how much would the air speed up as it goes out. NONE. Wait a minute a catalitic converter must work like a jet engine!!!! The exhaust speeds up as it goes through the honeycomb and pushes you along!!! I'm going to put mine back on this minute!! :rolleyes:

 

One more thing;
I agree with you that the screen speeds up the air, but remember that the sensors are not right after it but rather a few inches down. The air has more than enough time to spread out and slow down again. Does the wind blowing through a screen door speed up yes but you will never feel it because it slows down long before it gets to you

 

It's not a 1/4" honeycomb, it's 75mm on pre 2001 and 85mm on 2001 and up.
They are not sensors, they are wires. The whole MAF is the sensor. The MAF is a short tube. It doesn't slow down, the engine is sucking the air in like crazy. :crazy:
No I wouldn't. If the amount of fuel to mix with that air is incorrect, the engine will run like crap.
I don't know if every engine comes from the factory running a little rich. They try to keep them running about 13.3 to 13.5 to 1, which MAY be a little rich compared to the 14.7 to 1 ideal, but ideal is for the most efficiency, and not nessecarily the best performance.
You missed the point of the lesson.
It would if you have a pump sucking the exhaust out from behind them.
REMEMBER, the MAF is in an airstream that is being propelled from high pressure to low pressure. Check it out! Stick your hand over the throttle body opening with the engine at WOT and see how long it stays attached to your wrist. :crazy:


[Modified by ArKay99, 11:58 AM 1/8/2004]

 

:conehead

 

So, what do you guys think the real reason is for the screen?

 

to protect the sensors in side the MAF

 

From idiots like 98VETTEC5 :cuss :smash: :conehead :p: :troll

 

Now you had to get personal about it. But it's ok I know I'm right! :D

 

:rofl:
Whatever... I'm done with this thread. :seeya

 

thank you!!

 

I saw that you elected to remove the screen but the post that said you should use LS1 edit was correct. By removing the screens you have in affect changed the MAF tables in your PCM. The reason the car still works ok is because the PCM is compensating for the change with learned fuel trims but not in the way it is designed to. I guess you could saw it is in a type of fail safe mode.
Look at the MAF tables shown in this article: http://www.ls1howto.com/index.php?article=25
Then read this article: http://www.vetteguru.com/mods/howto/
Removing the screen is not bad but the work is only half way complete without changing the MAF tables.

:cheers:


[Modified by 57xray, 2:04 PM 1/8/2004]

 

arkay99,
The lesson to be learned here is that only a fool argues with a fool!! :yesnod:

Once you realized that 98vettec5 couldn't comprehend what you were trying to explain, you should have left it alone. :thumbs:

 

:iagree:
Live an learn. :thumbs:

 

What the kiss?? I understood everything he was spilling from his mouth. YOu sir are a piece of poopie. God damn you can get anything across to you guys can you?? Where is his degree in engineering?? But hey don't listen to GM what do I care??

 

Blah, blah, blah :rolleyes:.

The screens are on the lsx motors (with the exception of the '02+ LS6) becuase of their use in the pickup trucks. The trucks don't have a straight intake path and need the screens to create laminar airflow (straighten it out) so the MAF car accurately read the airflow. The Corvette has a strainght intake path and has NO need for the screen. The problem is that you have to tune the car to run correctly. Since a screen-less MAF is flowing more air now the MAF calibrations will be off and the PCM is "seeing" less air than is actually flowing. Thus, the car can run lean. Now if you're getting a tune then rip that sucker out. :cheers:

 

Fairleigh Dickenson University. Class of 1974. Bachelor Of Science Electrical Engineering.
That is why I know how a MAF sensor works, that is how I know how the PCM works. I've been designing professional audio equipment for 30 yrs, embedded controllers for 15yrs, and writing code an programming computers for almost 20 yrs. :rolleyes:
And Cobra48, you are right. It's a bunch of air about air. I thought I was helping this tortured soul until it was obvious he was being beligerant, obnoxious, and ignorant. :crazy:

 

Basic idea of the screen is to keep trash or large objects from going into the engine.

 

That is what the air filter is for. :)