DE-SCREEN Your MAFS By BIGBADSILVERDO

[BIGBADSILVERADO]

Here are some directions I wrote up last APRIL when I did DE-SCREENED my mass air flow sensor .hope it help!!!

DIRECTIONS to DE-SCREEN Mass Air Flow Sensor (http://www.xofmot.com/mafs.html)

[Kryptonite]

Has anyone every tested this mod...to see if it adds horsepower or reduces quarter times?

[Kryptonite]

Nice typing hey! Give me a break its 1:40 in the morning

Originally posted by thunderbolt
Has anyone ever tested this mod with hypertech or what have you...to see if it adds horsepower or reduces quarter times?

[02Silverado]

Originally posted by thunderbolt
Nice typing hey! Give me a break its 1:40 in the morning



I descreened mine and felt a difference. I didnt take it to the trakc or get it dynoed before and after though. Definally worth it though> Takes about 5 mins and its free.

[454ss]

Any free mod is a good mod:read: :D

[Joe]

Nice work on the tech page. Looks good :cool: :D


FYI - Personally, I don't know if this actually provides measurable gains or not. If anyone is researching this mod, here is a URL posted a while back (Henry?) on reasons not to do it:
http://www.gmtips.com/3rd-degree/dox/tips/maf/maf-screen.htm

[CKTA]

Originally posted by gmcjoe
Nice work on the tech page. Looks good :cool: :D


FYI - Personally, I don't know if this actually provides measurable gains or not. If anyone is researching this mod, here is a URL posted a while back (Henry?) on reasons not to do it:
http://www.gmtips.com/3rd-degree/dox/tips/maf/maf-screen.htm

I have done it one all my stuff w/ MAF's including all my thirdgens. One of the first mods. I do.:cool:

[CKTA]

Originally posted by CKTA


I have done it one all my stuff w/ MAF's including all my thirdgens. One of the first mods. I do.:cool:

BTW, Corvettes are coming w/ de-screened MAF's from the factory now.:read:

[Joe]

Originally posted by CKTA

I have done it one all my stuff w/ MAF's including all my thirdgens. One of the first mods. I do.
One more reason not to do it :read: :D

Originally posted by CKTA

BTW, Corvettes are coming w/ de-screened MAF's from the factory now.:read:
I've seen that. Could there be something to the programming on the vehicle? If the Corvette is programmed to operate without the screen that would make sense? I have no idea, I'm just throwing it out there.

Has anyone dynoed an LS1 before and after de-screening the MAF to see the real difference?

[CKTA]

Originally posted by gmcjoe


Has anyone dynoed an LS1 before and after de-screening the MAF to see the real difference?

Yes, I have done it to alot of my friends LS1's and they picked up 1 hp w/ a stock lid, more w/ a aftermarket lid. Plus, it's free and a Granitelli MAF actually hurts performance 99% of the time on those cars.:read: Waste of 300 + bucks.:D

[Joe]

Originally posted by CKTA
Yes, I have done it to alot of my friends...
Stick to the topic sicko :gone2far:


Originally posted by CKTA
My friends LS1's picked up 1 hp w/ a stock lid, more w/ a aftermarket lid. Plus, it's free and a Granitelli MAF actually hurts performance 99% of the time on those cars.:read: Waste of 300 + bucks.:D

I heard the Granatelli doesn't provide gains.
Sounds like a decent mod if you don't F-up the MAF (something I would probably do) :bawl:

[CKTA]

Originally posted by gmcjoe


I heard the Granatelli doesn't provide gains.
Sounds like a decent mod if you don't F-up the MAF (something I would probably do) :bawl:

The Granatelli MAF su(ks! It makes that cars run lean as all hell.:(

And even you King Tard can do it w/o messing it up. Sh*t, even Izzy did it.:read:

[CKTA]

Originally posted by 5-8CHEVY

:word: Took longer to take off the MAF than to descreen it. :D I used the handle of a screwdriver and gently tapped on the screen to dislodge it. :D

Are you sure you're not ASE certified?:D

[CKTA]

Originally posted by 5-8CHEVY

2 more mail order courses and I will be. :D :tongue:

:LOL: Did you get a free Ding King w/ that?:D

[CKTA]

Originally posted by 5-8CHEVY

No but I got the Turbo Cooker 3000. :D :cussing:

FYI, don't drink the fat that drains out while cookin' moron!:tongue: :D

[CKTA]

Originally posted by 5-8CHEVY

That's gravy not fat. :read: ;) :D

**David Spade voice from Tommy Boy** "I can hear you getting fatter!":D

[HENRY]

Originally posted by gmcjoe
Nice work on the tech page. Looks good :cool: :D


FYI - Personally, I don't know if this actually provides measurable gains or not. If anyone is researching this mod, here is a URL posted a while back (Henry?) on reasons not to do it:
http://www.gmtips.com/3rd-degree/dox/tips/maf/maf-screen.htm

At the risk of pissing off all the :assclown: 's and sticking to the topic, that article is a little dated (according to someone here i talked to) and doesnt really apply to the newer vortecs.

There have been a few people that have actually tested without the MAF and have documented actual gains.

I said screw it and did it anyway :D

[Badassilverado]

Anyone with the 99+ notice any gain in throttle response? When I have it on tow/haul I notice alot of difference in TR but I don't like to use it because it eats gas. Shifts good, but the exhaust sounds alot different, not nearly as loud or deep.

[nomosyclone]

Originally posted by Badassilverado
Anyone with the 99+ notice any gain in throttle response? When I have it on tow/haul I notice alot of difference in TR but I don't like to use it because it eats gas. Shifts good, but the exhaust sounds alot different, not nearly as loud or deep.

There is an 11hp gain on the dyno when I used the T/hual button:smokin:

[2003Silv]

1. Does the engine light come on when you descreen the sensor?

2. Is the sensor compromised in any way when driving either with the stock intake or later with an aftermarket intake?

3. Is the stock sensor expensive (in case I fk something up)?

[pebbleboy]

Originally posted by 2003Silv
1. Does the engine light come on when you descreen the sensor?

2. Is the sensor compromised in any way when driving either with the stock intake or later with an aftermarket intake?

3. Is the stock sensor expensive (in case I fk something up)?
I descreened mine awhile ago. I had no problems with any engine lightrs coming on yet.

I was also worried about messing it up so I took it out and was looking at it. I ended up just using my fingers to push it out. It was a little difficult at first but came out without damageing anything.

[Germanator]

seemed a easy task, although I was worried damaging something.
Everything seems to be working normal, the test comes tomorrow. Will see if there is any power gain, if so, it might be so slightly, that it is barely noticable if at all. But the end result matters, less air flow restriction, and every bit of HP increase counts :D :devil:

[gnd111]

FYI - Personally, I don't know if this actually provides measurable gains or not. If anyone is researching this mod, here is a URL posted a while back (Henry?) on reasons not to do it:
http://www.gmtips.com/3rd-degree/dox/tips/maf/maf-screen.htm [/B]


I read the link... Here is a quote from the page:
"1. If you are driving a stock intake car this mod will do absolutely nothing for you.
2. If you have such a heavily modified engine that it would make a difference Why are you using the MAF system anyway? .....you should be on Speed Density with a custom chip."


Every builder in America will tell you Speed Density is junk and to use a MAF so makes me wonder about this guys knowledge on the subject.....

[Citizen Rider]

the link on how to do the mod doesnt work:(

[BIGBADSILVERADO]

Yea, 1.5 years after leaving AOL...they finally caught up to removing my page (about two weeks ago!).........

I'm working on another one (WEB-PAGE) and will update this darn thing asap!!!

If you need pics....feel free to e-mail me XOFMOT@COMCAST.NET

[BIGBADSILVERADO]

The directions are back up and running!!!!!

[JD'98]

SweeT :deadhorse :sheephump

[cb98chvy]

:charge: WTF... I'll try it! ITS FREE!!!

:D HeH five mins tops! to better throttle responce:head:
Thanx!

[Nick]

Don't do it. :read:

[Cracker]

Originally posted by Nick99Chevy
Don't do it. :read:

And your reasons are??

[Mezikedz71]

Well screen is out..... feels good...

[bigcfromcinci]

can i do this to my 95 suburban w/ 350?

thanks!

[Nick]

Originally posted by Cracker
And your reasons are?? After the descreen mine always pinged on 87 octane until I put a screened MAF back in. Didn't notice any gain either.

[Mezikedz71]

The octane rating of a given grade of gasoline is a measure of its detonation resistance. The higher the octane number, the better able the fuel is to resist detonation. Most engines in good condition will run fine on regular grade 87 octane fuel. But engines with high compression ratios (over 9:1), turbochargers, superchargers, or with accumulated carbon deposits in the combustion chamber may require 89 or higher octane fuel. How a vehicle is used can also affect its octane requirements. If a vehicle is used for towing or some other application where the engine is forced to work hard under load, a higher octane fuel may be necessary to prevent detonation.

over 9:1

5300 vortec is rated at 9.5:1......

http://www.federal-mogul.com/cda/content/front/0,2194,2442_7359_7525,00.html

[SLMDLT1]

Originally posted by bigcfromcinci
can i do this to my 95 suburban w/ 350?

thanks!

Nope, you do not have a MAF.

[RJ213]

would it hurt anything if i did it on a 98 silverado1500 4x4 with the 4.3 engine?

[OKLAGMCRUISER]

don't waste your time...

[RJ213]

oh im just curious really

[OKLAGMCRUISER]

it won't help you and will cause more problems than it's worth...I've heard of alot of pinging issues once the maf was descreened...and no sotp feelings whatsoever...I did this mod and went back to a screened maf becasue of pinging issues.

[4.8Silv4x4]

Just did mine, I did warp the screen when I took it out so I hope I dont need it for any reason. :damnit: But driving back to Chicago tonight from Peoria, so good 3 hours to notice any difference.

[yachtman]

And also note the reasons listed Not to descreen in Tech article 76548 pg. 7 - its a calibration issue..gains are minimalAfter the descreen mine always pinged on 87 octane until I put a screened MAF back in. Didn't notice any gain either.

[NEVER2LOW]

I can also confirm the pinging after descreen. I descreened my roommate's 4.3 (pretty heavily modded) and it worked fine, but when I did mine, it sounds like a massive POS. All I can hear is pinging, whether it be lightly squeezing the throttle, or at WOT. DO NOT BOTHER WITH THIS MOD! Now I am off to buy a new MAFS...

[blazenlo95]

I never had the pinging in my 99, sierra, 5.3 but also gained absolutely nothing! I left the one in my hoe alone.

[justin]

For anyone contemplating this mod, please don't.

Below is a comparison of a stock MAF signal vs that of a De-screened MAF. Top is from an 03 Tahoe, bottom is from an 04 Tahoe.

http://www.marketitright.com/ss/tuning/MAFvsD-MAF.gif

MAF signal should be smooth, not jagged as it appears in the de-screened MAF. No amount of altering the MAF calibration can fully compensate for this problem.

[00'blackout]

Thanks Justin.

[rsnkane]

After reading all this about just descreening the MAF, I've got a question. Has anyone went a step farther and taken the MAF apart and used a die grinder to eliminate the 2 pieces of aluminum inside each half and smooth them out so when you look thru the MAF all you see is the sensor wires? I haven't done it to my Tahoe but a few years ago when I was turning wrenches full time, the shop I worked at done it to several and nobody ever complained about pinging or any other problems. I don't know what kind of increase they got if any, I was just curious.

[TheBigRedZ71]

I took a flat head screwdriver and popped the screen out in mine, I dont know if it helped any but I know when i put it to the floor it seems like it has little more pick up.

[LoneStarZ71]

It's all in your head.

[TheBigRedZ71]

i know but i'm tellin myself it has more pickup

[phatchevy06]

I did mine around 4 years ago and I couldn't really tell anything. I've never had any problems either though and the truck runs like a beast so I :dunno:

[TheBigRedZ71]

For anyone contemplating this mod, please don't.

Below is a comparison of a stock MAF signal vs that of a De-screened MAF. Top is from an 03 Tahoe, bottom is from an 04 Tahoe.

http://www.marketitright.com/ss/tuning/MAFvsD-MAF.gif

MAF signal should be smooth, not jagged as it appears in the de-screened MAF. No amount of altering the MAF calibration can fully compensate for this problem.

Not knockin your info sources but ne1 can use the paint program on their comp and make those diagrams

[Jeff96chevy]

I remember reading about this topic on thirdgen.org awhile back. Somebody there had removed their screen and it set off a code, so they re-installed it. What they said (and it sounds logical to me) is that the screen evens out the airflow through the sensor. If your intake is curved slightly, (my firebird maf had a sharp curve right before the sensor) then I guess it's possible to have a higher density to one side of the sensor, giving it a false reading. That's what I read anyway.

[Redneck Rebel]

Not knockin your info sources but ne1 can use the paint program on their comp and make those diagrams

Whats the point? A 10 year old also managed to make convincing counterfeit 100 dollar bills less than a week after they were released