Descreened maf
its a coin toss. ive done it and i have a spare with it still in. i have 70k miles with it out with no probs. I didnt feel anychange in power either way. but if you search you will know there is 1000's of threads just like this one.
TECH Fanatic
Joined: Jun 2006
Posts: 1,285
Likes: 1
From: Elgin, Il
I wouldn't do it. The screen is your car's last line of defense against debris entering the engine. It also straightens air as it passes over the hot wire in the mass air flow sensor. Descreening it can mess with the linear pattern of incoming air and create an uneven voltage pattern to the PCM.
Simply wouldn't recommend - Not for the .25 horse you gain
Simply wouldn't recommend - Not for the .25 horse you gain
why does everybody say this? Its the most absolutely incorrect thing ever. Your air filter assembly is what keeps debris from entering the engine. If stuff is getting passed that then you need to seal it better. Your mass air flow is not a filter!!! It is a meter used to measure!
TECH Fanatic
Joined: Jun 2006
Posts: 1,285
Likes: 1
From: Elgin, Il
Your exactly right, but what if there is a tear in your air filter you didn't realize or if the seal leaks. I've seen cars with wood chips in front of the screen. Of course there was another problem with the intake system but the fact is the screen saved that engine. Of course the MAF isn't a filter, but the screen can serve as one. 
if youll look closely at that "screen" youll realize its not a true screen. Its longer so it can flatten out hte air as it enters the TB. not crucial in that aspect, but as far as being a backup to your filter...
just look at it and try to estimate the amount of surface area you are getting rid of, then think about the price youll pay if something makes it into your manifold, do the math.
plus unless you are already making some good power, you shouldnt worry about it.
just look at it and try to estimate the amount of surface area you are getting rid of, then think about the price youll pay if something makes it into your manifold, do the math.
plus unless you are already making some good power, you shouldnt worry about it.
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take it from someone who has hpTuners..... dont do it. It wont do you any good and its just confusing as hell trying to tune with it.... support your local tuners!
the MAF tables are calibrated for the stock MAF with the screen in it. The screen allows a more accurate representation of how much air is actually going into your engine by creating a more linear flow over the resistors on the MAF.
just my opinion..... please correct me if I am wrong.
the MAF tables are calibrated for the stock MAF with the screen in it. The screen allows a more accurate representation of how much air is actually going into your engine by creating a more linear flow over the resistors on the MAF.
just my opinion..... please correct me if I am wrong.
If you get an 85mm MAF take out the screen and tune for it u will get horsepower. How much? 10 at 6500. If you dont tune for it you will get less horsepower. A cheep 65$ mod if done right. If not you will loose power.
Your exactly right, but what if there is a tear in your air filter you didn't realize or if the seal leaks. I've seen cars with wood chips in front of the screen. Of course there was another problem with the intake system but the fact is the screen saved that engine. Of course the MAF isn't a filter, but the screen can serve as one.
hahaha
I descreened the maf on my old camaro. didnt notice any difference in performace or had any problems. It might lean out the tune a lil bit.
I recommend leaving it in since the gains are negiliable if any but has potential for problems.
I recommend leaving it in since the gains are negiliable if any but has potential for problems.
Leave it stock, or remove it, and/or port it ... but as a tuner, get it checked and tuned if necessary. It is very easy to tune the MAF table with a wideband. Most of the time a moddified MAF will read leaner, because you are allowing more air to enter the engine and it will go unmetered (until after the O2 sense it). Which means more fuel can be added by tuning. Also, saying it can support 500rwhp doesn't mean squat. Stock exhaust manifolds can support 500rwhp, but you will benefit from a larger exhaust. Same thing with the intake. 
I descreened mine when I installed my SLP Air Lid last May. No problems thus far. As stated, if your air filter is in proper working condition I see no need for it. I was gonna do this to my friends 98 Z28, but maybe I'll wait. We'll see...
