Descreen this MAF?
Thread Starter
Advanced
Joined: Feb 2005
Posts: 87
Likes: 0
From: Lebanon, OH
Descreen this MAF?
I know there is much debate about the advantages and disadvantages of removing the screen from a MAF. My question; is there any advantage to removing this damaged screen? I removed this to clean my throttle body and have not experienced any noticable problems prior to dissasembly.
Thanks.
Thanks.
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
I would recommend that you either repair that one as best as possible or buy a rebuilt one from a parts store.
I descreened my MAF and the idle started to suck and the gas mileage went to hell. I bought a rebuilt unit from Advance Autoparts and voila...back to normal.
I descreened my MAF and the idle started to suck and the gas mileage went to hell. I bought a rebuilt unit from Advance Autoparts and voila...back to normal.
Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
I descreened my MAF and picked up 7rwhp. Did it affect the idle/gas mileage? I have heads/cam/intake/exhaust mods....the idle and mpg were the same before and after. Also it is my understanding that some years had the screen and some did not. I don't think the Z06 has the screen. Most aftermarket MAFs don't have screens.
Thread Starter
Advanced
Joined: Feb 2005
Posts: 87
Likes: 0
From: Lebanon, OH
From your experienece (AFTRBRNR) a screen is better than no screen. Since I did not experience any ill effects I am considering leaving it as is. But is my car underperforming because of the screen?
Last edited by convette01; Dec 26, 2008 at 07:51 PM. Reason: Added name
Thread Starter
Advanced
Joined: Feb 2005
Posts: 87
Likes: 0
From: Lebanon, OH
verano29, did you remove the screen prior to all your Mods?
My car has a vararam, larger tbody, corsa exhaust. I have read that screen removal works better for cars that have been modified like yours.
Thanks.
My car has a vararam, larger tbody, corsa exhaust. I have read that screen removal works better for cars that have been modified like yours.
Thanks.
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
How does the MAF determine MASS AIR FLOW when it's destroyed in this way? The screen IS THERE FOR A REASON!
This is my understanding of how they work: http://www.autoshop101.com/forms/h34.pdf
This is my understanding of how they work: http://www.autoshop101.com/forms/h34.pdf
Last edited by dougbfresh; Dec 26, 2008 at 08:51 PM.
Thread Starter
Advanced
Joined: Feb 2005
Posts: 87
Likes: 0
From: Lebanon, OH
I believe I have 3 choices:
Buy a new MAF
Remove the screen, see how the car reacts and modify the tables if needed
Leave as is and not know what I am missing since I am not getting any codes.
I guess it is more a matter of my budget.
Buy a new MAF
Remove the screen, see how the car reacts and modify the tables if needed
Leave as is and not know what I am missing since I am not getting any codes.
I guess it is more a matter of my budget.
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Melting Slicks
Joined: Apr 2001
Posts: 3,034
Likes: 125
From: NY-South Florida
The screen is there to provide a laminar airflow past the MAF element. If you remove the screen, the air will not track properly across the element. Many times this will cause lean tip in conditions, detonation and poor drivability.
A gain CAN be had if tuning is done to correct this "self inflicted" airflow error that is caused. We have installed many new MAF's on cars where customers complained about poor idle, pinging and weird issues that where all fixed after a stock MAF was installed because of "descreening".
We have many 700+ RWHP cars that still retain the screens so we don't both pulling them out. Sometimes people pull them and have no issues but most don't see what the PCM is doing to counter act it by data logging.
Hopefully this makes sense!
Howard
A gain CAN be had if tuning is done to correct this "self inflicted" airflow error that is caused. We have installed many new MAF's on cars where customers complained about poor idle, pinging and weird issues that where all fixed after a stock MAF was installed because of "descreening".
We have many 700+ RWHP cars that still retain the screens so we don't both pulling them out. Sometimes people pull them and have no issues but most don't see what the PCM is doing to counter act it by data logging.
Hopefully this makes sense!
Howard
Le Mans Master
Joined: Feb 2003
Posts: 6,683
Likes: 144
From: Memphis Tennessee
I know there is much debate about the advantages and disadvantages of removing the screen from a MAF. My question; is there any advantage to removing this damaged screen? I removed this to clean my throttle body and have not experienced any noticable problems prior to dissasembly.
Thanks.
Thanks.
I guess I don't see the damage. Where is it?
Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
Actually, my tuner recommended removing the screen. I had it removed while the car was on the dyno...which is why I know I picked up 7rwhp.
BTW, my tuner is no hack...he is one of the most respected corvette builders/tuners of all time (Doug Rippie).
Racer
Joined: Nov 2008
Posts: 378
Likes: 0
I would be very, very surprised if removing the screens is responsible for 7 RWHP, or anything above 2 RWHP, and 2 RWHP is being very generous.
My opinion is to leave the screens alone. Those screens stop turbulence. The MAF with screens is more than capable of flowing plenty of air to our cars, of course unless they are modded to no end.
Racer
Joined: Feb 2005
Posts: 491
Likes: 2
From: Arlington Hts. IL
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
The C5 Z06 models that do not have the screen are tuned from the factory to work correctly. If you car was equipped with a screen and you remove it; the flow of air going over the sensor will not be shaped the way it was intended to.
My car was maxing out fuel input to compensate for the incorrect air reading. My idle went to crap and throttle response was poor. My car was slightly modified at the time.
You can fix this problem with a tune. If you have a tuner that is very smart with the EFI tables then go for it and you may pick up like 2 RWHP.....hardly worth it!!!!!! GM technicians aren't stupid, that screen is there for a reason. I wouldn't even bother spending the money for an upgraded MAF from aftermarket companies. Granitelli will leave you dissappointed and SLP will need a tune.
The damage you have is negligable. Use a needle to bend back the bent honeycombs if it bothers you that much. I doubt your car even notices that little bit.
**Oh yeah....My car is "Modded to no end" and I have the STOCK MAF! Works like a charm and can burnout the tires past 75 MPH without using a brake assist.
My car was maxing out fuel input to compensate for the incorrect air reading. My idle went to crap and throttle response was poor. My car was slightly modified at the time.
You can fix this problem with a tune. If you have a tuner that is very smart with the EFI tables then go for it and you may pick up like 2 RWHP.....hardly worth it!!!!!! GM technicians aren't stupid, that screen is there for a reason. I wouldn't even bother spending the money for an upgraded MAF from aftermarket companies. Granitelli will leave you dissappointed and SLP will need a tune.
The damage you have is negligable. Use a needle to bend back the bent honeycombs if it bothers you that much. I doubt your car even notices that little bit.
**Oh yeah....My car is "Modded to no end" and I have the STOCK MAF! Works like a charm and can burnout the tires past 75 MPH without using a brake assist.
Last edited by AFTRBRNR; Dec 27, 2008 at 11:10 PM.
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
As I just mentioned...GM recalibrated the tune in the Z06 to work properly without the screen in their attempt to up HP as much as possible while keeping costs down.
De-screen the MAF in a car that came with one is the same as taking a cog out of the wheel.
Taking the insoles out of your sneakers before a roadrace to reduce weight is negligable to your intent and will cost you performance wise.
Same type of analogy.
De-screen the MAF in a car that came with one is the same as taking a cog out of the wheel.
Taking the insoles out of your sneakers before a roadrace to reduce weight is negligable to your intent and will cost you performance wise.
Same type of analogy.
