Maf screen removal
Safety Car
Joined: Oct 2007
Posts: 4,269
Likes: 4
From: Mililani HI
I removed mine when I installed my ported and polished throttle body, no problems since the removal which is over 10K miles ago. Unknown if it increased performance, however to me it was a restriction in the intake system.
Thread Starter
Racer
Joined: Nov 2007
Posts: 327
Likes: 0
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
The reason its there is to catch large material that might accidentally slip past the air filter. I know someone who removed theirs and the air filter actually failed and was sucked into the intake maifold because it wasnt there to stop it. Pretty rare but why take the chance you wont really net any huge gains from it.
Drifting
Joined: Apr 2006
Posts: 1,276
Likes: 5
From: Ambler Pa.
maf screen
Z06's have no screen from the factory. I have removed the maf screens on all of my LS1, LS2's ,[ 3 ] , started doing that over 10 years ago. No problems , I do recommend tuning afterwards, not necessary but beneficial to do so . LTFT's will be affected approx. 10%.
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Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,684
From: Southeast TX
Unless you're running some real serious HP, there's no reason to do it. I'm not sure the stock MAF is a restriction under 600 engine hp. I went speed density on a supercharged LQ4 that made 600+hp. Removing the MAF completely yielded a HP increase of plus or minus "0". Driveablitly did increase though.
Drifting
Joined: Jul 2006
Posts: 1,786
Likes: 93
From: Charlotte N.C.
That's the purpose of it. People with early model OBDI cars pay to have these installed to reduce the turbulence hitting the MAF sensor. Becomes especially important with Forced induction.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
A stroker car (440CI) making 510rwhp swapped to a 100mm unit and gained 30rwhp.
On LS3's and LS7's there is no screen and it isnt needed.
The C5 Z06 used the screen on all models except the 2002+ Z06 because its a flow disruption and the car benefits from deleting it. I had a max-effort 348 forged motor in my C5 with nitrous and I deleted it picking up 9rwhp with better driveability.
It is not for straightening out air. The flagship 2002+ Z06 got rid of it for power gains thus GM knew it was not helping performance.
I wish this rumor would die already or please post the source of your info. I dont think you can because GM never said it.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
MAF facts.
At 400rwhp dont touch it. It isnt going to do anything until you hit a power level where its warranted.
At 500rwhp, the car will benefit from a 299 dollar 100mm Lingenfelter MAF 12-15rwhp and a tune is needed for it.
At 600rwhp (forced induction included) the stock MAF is maxxed out and will benefit from it being swapped out for a bigger unit or running in speed density.
At 700rwhp, no MAF will meter that high on some year cars no matter what size it is.
Keep in mind that N2O is its own air supply and wont affect MAF levels if its a wet shot.
At 400rwhp dont touch it. It isnt going to do anything until you hit a power level where its warranted.
At 500rwhp, the car will benefit from a 299 dollar 100mm Lingenfelter MAF 12-15rwhp and a tune is needed for it.
At 600rwhp (forced induction included) the stock MAF is maxxed out and will benefit from it being swapped out for a bigger unit or running in speed density.
At 700rwhp, no MAF will meter that high on some year cars no matter what size it is.
Keep in mind that N2O is its own air supply and wont affect MAF levels if its a wet shot.
Race Director
Joined: Jan 2004
Posts: 18,724
Likes: 709
From: Bergen County, NJ
Originally Posted by PAUZAO
I was told that the function is mostly to reduce turbulent air, and smooth it out. My LS3 did not have that screen.
I was told that the function is mostly to reduce turbulent air, and smooth it out. My LS3 did not have that screen.
I can't say if it's true or not, just that I read it several times.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Now people can say they read in the C6 tech section that the screen is costing power, and GM agrees by deleting it on the faster cars. It wouldnt make sense if it helps performance for GM to take the screen off the 2002 Z06 and leave it on the 2002 base C5 would it? Well thats exactly what they did in 2002....a fact.
Last edited by SpinMonster; Mar 7, 2009 at 05:09 AM.
Drifting
Joined: Jul 2006
Posts: 1,786
Likes: 93
From: Charlotte N.C.
FI cars benefit from the 100mm lingenfelter unit to the tune of 20rwhp. I got rid of it on my car at 700+rwhp....paxton S/C.
A stroker car (440CI) making 510rwhp swapped to a 100mm unit and gained 30rwhp.
On LS3's and LS7's there is no screen and it isnt needed.
The C5 Z06 used the screen on all models except the 2002+ Z06 because its a flow disruption and the car benefits from deleting it. I had a max-effort 348 forged motor in my C5 with nitrous and I deleted it picking up 9rwhp with better driveability.
It is not for straightening out air. The flagship 2002+ Z06 got rid of it for power gains thus GM knew it was not helping performance.
I wish this rumor would die already or please post the source of your info. I dont think you can because GM never said it.
A stroker car (440CI) making 510rwhp swapped to a 100mm unit and gained 30rwhp.
On LS3's and LS7's there is no screen and it isnt needed.
The C5 Z06 used the screen on all models except the 2002+ Z06 because its a flow disruption and the car benefits from deleting it. I had a max-effort 348 forged motor in my C5 with nitrous and I deleted it picking up 9rwhp with better driveability.
It is not for straightening out air. The flagship 2002+ Z06 got rid of it for power gains thus GM knew it was not helping performance.
I wish this rumor would die already or please post the source of your info. I dont think you can because GM never said it.
Prior to this I owned a turbocharged BMW M3 OBD I that experienced the same low speed driveability issues due to the remote location of the air intake. After many many months of attempting to tune the problem out, I ended up adapting a screen to the front of the MAF to straighten out the airflow and it fixed the problem.
My experience
Safety Car
Joined: Aug 2006
Posts: 4,347
Likes: 25
From: Apache Junction AZ
Forums are repeated rumors. A tech article with verified testing is the only true source of info.
Now people can say they read in the C6 tech section that the screen is costing power, and GM agrees by deleting it on the faster cars. It wouldnt make sense if it helps performance for GM to take the screen off the 2002 Z06 and leave it on the 2002 base C5 would it? Well thats exactly what they did in 2002....a fact.
Now people can say they read in the C6 tech section that the screen is costing power, and GM agrees by deleting it on the faster cars. It wouldnt make sense if it helps performance for GM to take the screen off the 2002 Z06 and leave it on the 2002 base C5 would it? Well thats exactly what they did in 2002....a fact.
http://ateam.lbl.gov/PUBS/cec/Append..._Fume_Hood.pdf
BJK
SUBVETTE
Joined: Jul 2006
Posts: 3,841
Likes: 93
From: San Diego CA
Here is an interesting tech article. Granted it isn't a maf screen per say, but is does consider the effects of a screen across an air flow.
http://ateam.lbl.gov/PUBS/cec/Append..._Fume_Hood.pdf
BJK
http://ateam.lbl.gov/PUBS/cec/Append..._Fume_Hood.pdf
BJK
