Descreening the MAF
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by larryfs
they're not screens. they're air straightening fins.
My recommendation is to NOT MESS with them. If you do, you take the chance of changing the calibration of the sensor itself. And if that happens the calibration will no longer match the calibration tables within the PCM. That means that the PCM will see either less or greater than actual airflow which will cause the fuel trims to skew to one side or the other. In extreme cases the PCM can be skewed to a point where it can no longer control the fueling of the engine.
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
Originally Posted by tjwong
My recommendation is to NOT MESS with them. If you do, you take the chance of changing the calibration of the sensor itself. And if that happens the calibration will no longer match the calibration tables within the PCM. That means that the PCM will see either less or greater than actual airflow which will cause the fuel trims to skew to one side or the other. In extreme cases the PCM can be skewed to a point where it can no longer control the fueling of the engine.
EXACTLY. the fins straighten the air so it can be measured properly.
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Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by Lone Ranger
LT1's only have front screens. L98's have front and rear.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,467
Likes: 43
From: Auburn MA
i removed them in my impala ss which has an lt-1 and i got no SES lights or negative performance issues thats why i was wondering about doing it on the vette. I know they sell the MAF ends which prettymuch do the same thing but i thought i read something a while ago saying that it is ok to remove the screen the imp ss and the f-bodys but the vette will actually kill performance by a tenth in the quarter and i was wondering if that was true or not.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Originally Posted by tjwong
My recommendation is to NOT MESS with them. If you do, you take the chance of changing the calibration of the sensor itself. And if that happens the calibration will no longer match the calibration tables within the PCM. That means that the PCM will see either less or greater than actual airflow which will cause the fuel trims to skew to one side or the other. In extreme cases the PCM can be skewed to a point where it can no longer control the fueling of the engine.
Instructor
Joined: Dec 2004
Posts: 142
Likes: 0
From what I know it can be worth the trouble of messing with the tables. However keep in mind your max airflow reading on L98's will always be 254 grams/second due to the fact that that is where the MAF output voltage maxes out. Dont know that cutting the screens would put you anywhere close to that at WOT (guess that would depend on the motor) but just something to think about.
Burning Brakes
Joined: Mar 2005
Posts: 1,054
Likes: 715
From: San Antonio Texas
Cop Car
I have a 9c1/LT1 ex-police car and was thinking about removing the screens. they might be for staightening the air but doesn't the process of staightening also cut down on airflow? What other Intake mods are worth buying... .58mm throttle body?, No-screen MAF(says it flows 45% more air), or cold air intake. Do these make a difference in horsepower. I have heard they do and I have heard they are a waste of money.
All Replies are appreciated
-Mark
All Replies are appreciated
-Mark
Le Mans Master
Joined: May 2004
Posts: 5,386
Likes: 534
Originally Posted by Lone Ranger
Screen removal helps L98's, doesn't help LT1's or LT4's.
Hmmm, it helps L-98s if they intend to see high rpm usage which is kind of a chuckle when you think about it. I would imagine it helps LT-1s and 4s if they're going to see similar high rpm pulls/runs.
