What did the mag say about de-screening it?

 

Ported MAF Ends & de-screened. Running strong.

 

yeah, i couldn't believe it either. they guy running the dyno said it's pretty normal to gain 2 or 3 rwhp just by pulling the screen. keep in mind that was with the stock lid. and unless you screw up the MAF somehow, you shouldn't throw any codes.

i'll try to find a scanner and get my before and after dyno curves posted. (cos i wouldn't believe it if i were you either!)

 

Thats a decent gain...looks like i will be de screening mine.

 

Count me in as another descreened! About 5,000 miles no problems no SES light

 

The juice isn't worth the squeeze, or in this case the potential aggrivation. I'd leave it alone.

 

Amen, And if you want your car to run good all of the time then just leave it alone. All it does is fool the computer then when you get into some real hot weather or the gas isn't perfect SPARK KNOCK AND RETARD.
A Z06 MAF may be smooth and without a screen but you can bet your last dollar that GM programmed the computer to run with it that way.
If you have LS1 edit, a MAF translator, or a custom tune then go for it.
Check my sig for stock MAF numbers.

 

How does descreening it fool the pc? I thought it just gave you more cfm...i really dont know so thats why i am asking.

 

I read on a website (Raughammer's Pepper was the name but the site won't come up anymore) that it messes up an A4. the computer reads less of a load through the maf and sends a signal to the transmission that there less of a load and over time it will start sliding into gear instead of shifting hard like it should. I had a ported maf and now it just slides into gear. I have been trying to find this site again but no luck.

 

Thanks for the info bud!

 

How the hell did you fit 17 x 11's in the front???? Are you sure they aren't 17x9 front and 17x11 rear?

 

Gaining 3rwhp from removing the screen, I'd be skeptical. 3-5rwhp is common variance between back-to-back pulls without changing anything. Dyno's aren't intended to be that accurate.

Modifying the MAF will cause the tables in the stock PCM to be inaccurate. Long story short, it leans you out, and screws up any PCM calculations which are derived from measuring the incoming airflow. It is correct about the A4's and ported ends (sorry to hear you found out the hard way, MARSTAUT.)

I started with the stock MAF. When my engine hydralocked, the builder installed ported ends. That was fine and dandy, except that it was hard to mail-order tune them. When LS1-Edit came out, the owners found it was difficult to calibrate the tables without actually flowing the MAF ends. I went back to a stock MAF and made the same power as the ported ends, and driveability was better, too.

If I were you, I'd leave it as-is. The 'gains' aren't worth the potential hassle down the road.

 

I do know that descreening a 98 A4 MAF will cause major problems. It doesn't have the same effect on the other years, but never do it on the 98 A4. I've seen several people try it, and it really screwed things up, but only on a 98 A4

 

agreed, however, here's the sequence: i did 3 pulls first, then pulled the screen, then did 3 more pulls. all 3 pulls with screen removed were higher than any pull with screen in. 3 rwhp was the gain from peak screen in to peak screen out. maybe i didn't gain 3, but there was some gain there to speak of.

i guess all i'm saying is that i gained some power and haven't seen any ill effects from it. but from all the posts i've been reading, maybe it should not be done. maybe i'm one of the lucky few who didn't screw up my MAF doing this mod.

it's hard for me to believe that pulling a screen out would create so many problems, especially when all the screen does is create small micro-turbulences in the air flow. if i wasn't so lazy, i'd grab my fluids book and do a bernoulli equation on it...

 

I got some non-ported Maf ends but I still need a screen, so if anyone wants to get rid of thiera I'm interested, I would recommend someone with a an M6 to sell thiers and the guys with A4's to put thiers back on.