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descreen my MAF

jackster06Z71

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jackster06Z71 Enthusiast

jackster06Z71

Posted
Posted

ive herd of guys doin this for more power and i was wonderin if it actually made a noticable difference , and also how does it come out and can i ever get it back in if i decide to take it out, i tried a search but didnt find wut im lookin for , i would appricate the feed back thanks JAck :nopity:

gmcjoe Senior Enthusiast

gmcjoe

Posted
Posted

There are quite a few detailed threads on this topic.

IMO - save your time and don't risk damaging your MAF sensor, it isn't worth it.

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted
ive herd of guys doin this for more power and i was wonderin if it actually made a noticable difference , and also how does it come out and can i ever get it back in if i decide to take it out, i tried a search but didnt find wut im lookin for , i would appricate the feed back thanks JAck :puke:

 

 

 

 

If you know whats good for you. DO NOT DO IT!!! Take that same flat blade screwdriver you would have jabbed the screen out with....... And go stab a tree a few times. It will honestly be more worthwhile.............

Landowner Enthusiast

Landowner

Posted
Posted

The screen in the MAF really does straighten the airflow. There was some discussion among LS1 F-body owners that de-screening was a bad thing, even though at first people thought it was good.

 

Jeremiah

"former Camaro SS driver"

OnyxMAX Enthusiast

OnyxMAX

Posted
Posted

aye some felly during a dynorun yanks the screen and gains x hp next thing you know it hits the net and everyones doing it.

 

the vett ls2 dosen't have the screen so it being out will harm nothing, and it's realy a emmisions thing. on the other hand the maf will flow 1000 cfm without the screen do you realy think a 325 (5.3) needs a 1000cfm airflow instead of the 750 cfm with the screen. to kinda relate it to carb trems.

gmcjoe Senior Enthusiast

gmcjoe

Posted
Posted

There are tons of threads on these truck forums relating to this.

 

IMO - leave it alone on an otherwise stock truck.

  • 2 weeks later...
Tucson_02Silverado Senior Enthusiast

Tucson_02Silverado

Posted
Posted

searching for the threads and coming to your own conclusions is about it, as in the last couple of years I've noticed the debate, it seems maybe a 60/40 split with 60 towards don't do it.

 

You could always checkout ebay and buy a used MAF and try it. But without solid dyno numbers you won't really know.

 

I'm always amazed with the people that actually do dyno run a part, make fantasic performance annoucements, but only run it once, instead of 5-10 times for averaging. A lot even make runs with the hood up when it should be hood closed and at the most a shop fan 20' away pushing ambient air towards the front.

 

You have to ask yourself what is more power? then you should have probably gone with a 6.0 or a Super/Turbo Charger. All said and done, It's a truck you ain't smearing "out-of-the-box" GTO/Charger/Stang's at the light. Maybe some coffee-can "buzzers", but they still have at least 2000lbs less weight.

  • 2 weeks later...
Tucson_02Silverado Senior Enthusiast

Tucson_02Silverado

Posted
Posted

ok...I got from a friend a MAF in which he pried the connector off instead of just taking the lock clip out and squeezing the lock tab.....I heard the loudest DOOOOOHHHH! when I showed him how easy it was to remove the connector.

 

Anyways, the MAF's lock tab was broken off and kept flagging him an IAT error code, so he bought another one.

 

I ripped the screen out of the old MAF, very easy and it comes out clean, zipped-tied my connector on. I notice no seat of the pants difference, nor do I notice any difference in MPG's or mid-range power (freeway driving).

 

Been driving for about a week with it descreened. I have a foam filter. I would think a gauze (KN type) filter might let a "big" enough particle through to damage one of the very fine wires in the MAF. I have no errors flagged. I also have a Wester's hot 91 tune, but it does not have an aftermarket/descreened MAF as part of it's requested tuning parameters.

 

In my case and in my opinion, it ain't worth risking a $150 part. Like I posted earlier, if you want to try it yourself, get one off of ebay cheap or from someone that likes to "shotgun" parts replacement to solve a problem.

  • 3 weeks later...
Coachmenguy Enthusiast

Coachmenguy

Posted
Posted

i did this on my '03 6.0L and noticed a "little" difference in pickup, i have a k&n intake as well, i dont see how this can do more harm than good, afterall it is more airflow, you get a lot of people on here with their bone stock trucks thinking gm knows best and their truck is tuned to optimal performance not knowing theres a number of safe things that can be done to wake it up

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted
i did this on my '03 6.0L and noticed a "little" difference in pickup, i have a k&n intake as well, i dont see how this can do more harm than good, afterall it is more airflow, you get a lot of people on here with their bone stock trucks thinking gm knows best and their truck is tuned to optimal performance not knowing theres a number of safe things that can be done to wake it up

 

 

 

 

Do you have any way of scanning or logging your truck?? I guarantee you that you will be running lean. May sound great. But deep down, you did absolutely no good. Trust me when I tell you this. I have been there. GM did put that screen in the MAF for a reason. To straighten airflow over the filaments. Now, that aside. Unless you are going to get out the laptop and TUNE for the absence of that screen. You ARE doing more harm than good. MAF table needs to be changed if you jam out the screen. Removing the screen isnt exactlly unsafe. Its just pointless.

 

Besides, that stock mass-air will flow enough air to support a power level you will probably never see!!

 

I have a screenless MAF if anybody wants to try this!!!!

Coachmenguy Enthusiast

Coachmenguy

Posted
Posted

allright 99silver6.0, believe it or not me and my buddy went in half and half and we have our own offical GM TECH II scanner, which tells you EVERYTHING you want to know about your ride, and there was no running lean what so ever! No offence but you sound like another one of those "gm knows best" people, dont put an aftermarket exhaust on your truck - gm's exaust is the way to go, dont put aftermarket wheels on your ride - gm's are made for the truck, dont put vent visors on your windows - gm didnt do it so it must be bad, dont put an aftermarket air intake on - gm's stock one is the only one that will work properly................you get my drift that was all sarcasim, when a new truck rolls off the assembley line it is so bogged down with emmisons crap, govenors, etc that most people dont know the real potental of these trucks, no that there dogs form the factory but if you thinks its great off the line, than roll with it but dont dog on the rest of us who attempt to improve our rides!

.justin. Enthusiast

.justin.

Posted
Posted
allright 99silver6.0,  believe it or not me and my buddy went in half and half and we have our own offical GM TECH II scanner, which tells you EVERYTHING you want to know about your ride, and there was no running lean what so ever!  No offence but you sound like another one of those "gm knows best" people,  dont put an aftermarket exhaust on your truck - gm's exaust is the way to go,  dont put aftermarket wheels on your ride - gm's are made for the truck,  dont put vent visors on your windows - gm didnt do it so it must be bad,  dont put an aftermarket air intake on - gm's stock one is the only one that will work properly................you get my drift that was all sarcasim,  when a new truck rolls off the assembley line it is so bogged down with emmisons crap, govenors, etc that most people dont know the real potental of these trucks, no that there dogs form the factory but if you thinks its great off the line, than roll with it but dont dog on the rest of us who attempt to improve our rides!

 

 

 

 

 

You've got Jared all wrong there.

 

There are a ton of people that have de-screened their MAFs over the years. It was the thing to do back before tuning software to get a couple of extra HP out of an otherwise basically stock car or truck at WOT. It was able to get this power by leaning out the overly rich WOT PE mode fueling. The sacrifice is positive fuel trims across the board, that will actually partially compensate for the lean PE fueling after a short while.

Example, local guy bought a wait4me tune, just wasn't running right. He had me take a look at it while driving around. At WOT, his tune was commanding either 12.5:1 or 12.7:1, I don't recall exactly. In actuality (because of this descreened MAF), he was running right around 14.5, with the passenger side bank actually dipping above 15:1 at one point.

He replaced the MAF with a properly screened one and no more lean issues. BTW, you'll need a wideband to measure this, not a Tech2. Tech2 will tell you commanded AFR, Narrowband O2 sensor voltages and trims, but not actual AFR.

 

Take that Tech2 out again with the de-screened MAF truck and watch your long term trims a bit and report back. What do they read at cruise and at WOT? Also, what do your front O2 sensors read at WOT? Reset the trims and try again and report back what it reads.

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