look what i found in one of my old magazines i thaught it was real bad to do this. Read the screen play part.......

here is a better pic

need better pic

posted just barley 2


late that would be stupid lets ruin our engine

how much air do we flow with them in.

Removing screens has been done since the beginning of time, and I've yet to hear anyone say anything bad about it. The fact is that if by some great act something actually got past your air filters, it would be tiny enough to fly right past those gaping holes in the screens. They're completely pointless, and only for guys that poke holes in their filters before driving through confetti. Stock cfm according to TPIS: 434. No screens: 512

The point of the screen is not to keep stuff out of the motor, but to smooth and straighten the airflow through the MAF. This helps ensure that the air at least in part passes over the filaments. Some of the LS1 guys have done the descreening thing and really regretted how the car ran afterward. I left the screens (flow straighteners) on my LS1 MAF. At ~3.5 in diameter, I doubt the car would ahve ever run right at low load without the flow straightener.

if you want more flow, build a freq. to voltage converter and use an LS1 maf rather then that old bosch stuff. On top of that, used LS1 mafs are dirt cheap.

If the point is to straighten out the air for the filaments, what's the purpose of the screen after the filaments?

Dead on answer. I still have the screens on both sides of the 87 TPI MAF. When most of the LS1 guys were taking the screen off their MAF"s and porting them, I just bought an aftermarket housing and put it around the electronics. Now everybody wants to borrow my MAF ends to tune their cars or buy them. No way. My car is running ok with the aftermarket ends but I will likely put back the stock housing. Screens are there for more of a reason than keeping out dirt.

To keep curious oily fingers off sensitive electronic parts that could be damaged by the mere presense of finger oil.

To disturb any reversion/backfire wave and hopefully keep it from killing the hot wire.

This is a pretty good write-up on the topic:

http://www.gmtips.com/3rd-degree/dox...maf-screen.htm

The newer mafs dont have it, but look to be reasonably durable inside. Ive backfired through mine and it seemed to take it without any ill effects. Just a WAG, but maybe the rear screen could also be to prevent post-wire turbulence at the rear of the MAF that could cause effects upstream.

Personally, Id be more worried about the imposed 255 gram/sec airflow limit in the ecm rather then the airflow potential of the stock MAF. Doesnt matter much if the computer doesnt add fuel to all that extra airflow. With a small ammount of reasearch and tweaking to the stock calibration, a larger, higher flowing MAF that wont peg on decent motors could be used.

I took mine off 2 years ago, and never noticed a difference, good or bad!

Its BS...the thirdgen screens dont straighten the airflow. They were designed to protect the delecate hot wire. In order to remove any airflow turbulance you would need fins inside the MAF. Remove the screens..they are a restriction...... Hey I got an idea lets all put the Tornado in our intake tubing.....if the screens straighten the airflow in the MAF so well imagine the HP gains of the Tornado.....Remove the screens..they are a restriction built into the MAF by the designers because they knew how delicate the hot wire MAF design was.

TPIS has an actual dyno sheet from where they removed the screens and fins from a MAF on motor with a cam. There is an increase in HP over all RPM ranges, with some gains as high as 10 HP.

I took mine off in my LT1, it was WAYYYYY more restricting than the TPI ones (i only had 1 screen btw) and I noticed that at WOT on the top end it breathed better.

I took mine off in my LT1, it was WAYYYYY more restricting than the TPI ones (i only had 1 screen btw) and I noticed that at WOT on the top end it breathed better.

On a karman MAF you need the screens. On a hotwire MAF they serve no real purpose.