For it cause when u buy7 after market how many screens do they have in it?? 0

 

you wont feel anything unless you screw up the elements while taking it out in which case you will feel a rather unpleasant stumble as well as a serious decline in gas mileage.

the screen is in place to smooth out the air. the bends in our intake will cause air to run unevenly through it so you must have the screen in place to spread out the air in order for your MAF sensor can do it job correctly. without the screen, unmetered air will slip past the elements which changes the fuel curve.

 

I've done both MAF mods, descreening and porting the ends.

The first mod was simply descreening the MAF. The car did seem to pull a lot harder on the top end. I did back to back runs with and without the screen to verify this. The car idled perfectly fine with no stumble.

Second mod was porting the MAF ends. I not only removed the vane from the ends but also cut out the center plastic support for as much airflow as possible. Porting didn't make any difference in power over the descreened MAF but throttle response really picked up. However, idle quality went down the tubes. The motor wouldn't idle properly worth a crap. The super quick off idle throttle response also tapered off over the next few days and the ported MAF became a waste of precious time and a bloody nuisance with the lousy idle.

After reading a fair bit about the pros and cons of porting and descreening the MAF, i decided to stick the screen back in to cut airflow down somewhat in order to restore idle quality. Although the car now idled like a stocker, strangely enough I didn't notice any loss in power with the screen in the ported MAF .

I recently switched back to descreened stock MAF ends. Contrary to my previous experience with descreened unported MAF ends, the car doesn't idle exactly like it should. It hunts around just enough not to be annoying.

So what do I think after having been through it all? Bloody waste of time I tell ya. Spend those extra hours at work and make some money to buy yourself a CAI kit that will actually help wake that LT1 up.

If you do decide to descreen the MAF, don't go stabbing at it with a screwdriver. Look at that screen. See that metal ring holding the screen in there? Pry it out with an awl or something similar. The screen will simply pop out now. If you don't like the results, pop it right back in.

 

YES

 

I believe the air smooths out the air for the sensor which is inside of the MAF, behind the screen. Not having the maf screen in will likely cause more variance in the readings read by the sensor because air is able to flow at it from many different angles and at different speeds. This may cause issues with the readings it sends back to the PCM, and the PCM may adjust its short term and possibly the long term tables if the readings are off enough, and it would be adjusting incorrectly.
Also you'd have to reprogram the PCM to take into account the overall increase in airflow, otherwise it may calibrate incorrectly as well, not counting the "wrong" reading from the more turbulent flow over the sensor.

No is my vote It's there for a reason, its not to flow air straighter into the engine - but to ensure air flows in a single direction over the MAF sensor.

 

Yes.

Yes.

Yes.

I've got 3 of these with no MAF screen in any of them so I can vote 3 times

BTW, no problems with any of them... go mpg issues, no idle issue.

 

after seeing Brents post, I had to think before posting this since I respect his opinion on this stuff...but I'm still gonna have to vote NO. Everything I have read has said "it doesn't seem to make a difference in power" but some things I have read say "it screwed my car up"...this seems like a lose-lose situation to me, even if it does absolutely nothing I have just wasted 15 minutes of my day to do absolutely nothing...time I could well spend eating candy bars or something

 

With the results being hit and miss at best why mess with it....I say no.

 

Do you have a few extra seconds to pop out the clip? Then I say do it. Do you have an extra 2 hours to port and polish the MAF and are very careful not to damage the sensors? Then go ahead and do that. Don't expect 30HP gains or something great like that. It's maybe worth 1-5HP. The only time you will experience idle/stumble/gas mileage problems is if you damage the sensors. I did mine and haven't had any trouble for over 2 years, port and polished and descreened. Did I see any gains? Not that I could notice. But I had a few hours to burn that day and an itch to work on my car. Even if it ends up only being a 1HP gain, that's 1 HP that didn't cost you a thing. Every little bit can help.

 

descreen

-Mindgame

 

Thanks

Here is why I did mine...

Flowbench measurements on the MAF (Superflow 300).
Measurements were made at 3" and converted to 28" (water).

(B-body) 3" MAF w/ screen = 670 cfm
(B-body) 3" MAF w/o screen = 808 cfm

(F-body) 3.5" MAF w/ screen = 759 cfm
(F-body) 3.5" MAF w/o screen = 979 cfm

As you can see, it is a decent restriction. For the 5 minutes it took me to take the screen out (and since I popped a "C" clip, it is reversible if it didn't work) I think it was worth it considering I have zero issues. If I would have had issues I could have easily re-installed the screen(s).

Having said this, I do disagree with porting the MAF housing IF you don't have a means to "adjust" the PCM. If you have any amount of mods beyond basic bolt ons, I don't recommend porting the MAF if you don't have LT1 Edit because it does make the MAF sensor report inaccurate valves. While this can be of benefit to stock, and bolt on cars, it can present a problem with cars that have several mods (like over 400hp just to throw a number out there). BUT, if you have a means to adjust the sensor to be "back in calibration" so to speak then by all means I 100% think it is a good idea to port the MAF. You can make these adjustments to bring it back in cal with programs such as LT1 Edit and Tunercat.

I'm of the belief that any amount of an intake restriction is bad and whatever can be done to reduce the restriction will help. How much it'll help is debatable but since I think it'll help (if even just a little ) then I'm going to do it

So, bottom line and IMHO... descreen the MAF, YES (easily reversible if you are one of the few who have problems), but port the MAF only if you have a program like LT1 Edit.

 

I have seen so many people who descreen and say they have idle problems and bad gas milage...I have told so many of them to go out and look at there car and see if they have the sensor in backwards. When people take off the screen then they think they can just throw it back in what ever way with out looking at it. It clearly says "this side towards air filter" on one side and it makes a huge dif. in the way it works.

I talked to so many people and this was thier whole problem,, Many won't addmit they over looked it though.. I just keep putting it out there so peolple will pay attention when they put it in and won't have the problems.

Pull that sceen and get some better flow.

 

Though I have no hard data to back up this postion, I think !MAF screen is a worthwhile mod on a car with a centrifugal blower. The SC is very sensitive to inlet restrictions.

BTW: Brent, thanks for the flow data, which supports my position.

Rich Krause

 

ok the vote is now:
18 votes to descreen....
17 votes not to descreen...
Looks like a toss up here, 50/50 on the free mod..
Anyone else have a vote on this.., maybe some hard facts to justify not descreening the MAF.., I wish there was a GM Enginere here that could tell us exactly what the screen does..
Thanks for the voting and go ahead and vote if you have not done so already...only takes 10 seconds to vote

 

My Scanmaster shows a 17 grams per second gain with the screen out. That's with a 215/224/112 cam, 1.6 rockers, and FLP's.

edit; no idle or mpg issues