Tiger2o69

iTrader: (16)

c5 came stock w/o the screen i do believe but he said his z28. In that case I have no idea what happened.

jimmyblue

iTrader: (11)

Here's the deal. Factory programming commands a fat
WOT AFR. If you hang some voodoo mod on there that
makes it lean out from 11.7:1 (as commanded) to 12.8:1
(rough peak-HP mixture) you will gain power. Especially
when you also pick up spark advance. Maybe even
the amount claimed. But the trouble with voodoo mods
is, they come back on you. Like, you might see that HP
bump when you first install it but then the PCM sees the
gris-gris has leaned you out and compensates it with
some fat positive LTFTs that step right on your brand
new proper mixture and put you right back where you
were, more or less. Plus the added bonus of a slipping
tranny that puts less pressure onto the clutches than
it should, on account of you told it it was on vacation.
Then you get to drive around thinking you have done
a clever thing, but your car hates you.

Descreening is fine as long as you have no chunks and
no gross turbulence / bias in the intake air stream. That
comes down to cases. Most (but not all) F-body folks
who have done it, say it's OK.

Porting is not fine, it's bad ju-ju and you will pay for
it sooner, later or both. MAF ends are shiny and cute
but they are still bad ju-ju. Unless you are a proper
witch doctor with a bag of tuning mojo, don't go there.

MillaTK

Haha... witch doctors.. good post...

Personally, if a mod like this causes so much confusion/debate, I would just leave it alone. Especially since you are not going to get too much out of it...

jason.sabovich

iTrader: (1)

Personally, if a mod like this causes so much confusion/debate, I would just leave it alone. Especially since you are not going to get too much out of it...[/QUOTE]

This mod causes alot of confusion and debate because most people don't understand how a MAF works or how descreening a MAF actaully makes power.
Just so happens I was reading my new book: Chevy LS1/LS5 V-8's by Will Handzel (it's the newest one out). He claims it's fine to descreen the MAF. The reason it's screened is to straighten out airflow before the MAF reads incoming air. Our cars have such a straight airflow path that they don't need a screen. Case and point: the 2002 and up Z06 corvette don't have MAF screens from the factory, now if GM removes it from a production car that has almost an identical engine/induction system to our F-Body's, I think it's ok. It's basically a carry over design from other vehicles that do need a screen.

As for porting, leave it alone, this one just about everyone is unanimous on.

blkZ28spt

I wouldn't use that logic. You never know what other changes were made. Fact is that the car was designed with every specific detail in mind and who knows what they did to the '02+ Z06 to compensate for the lack of a screen??

I will however agree with what's been posted in that I wouldn't worry about the descreen if you do it correctly and carefully but other than that don't touch it or replace it. Just what I have gathered from reading the board.

LiquidFire350

iTrader: (8)

from what ive read on this site, the stock screened MAF is good enought to handle 500HP(there abouts), so why descreen it, and if you do and it causes problems, guess what, you tore your screen out and cant put it back in, i figure if you really really want to take it out, buy the SLP MAF, the screen is removeable, so if you dont like it you can put it back in with no problems, IMO stick with the stock MAF srceened, no MAF Translator (for the exact reason jimmyblue stated) and no resistor mod

B-MAN

I got 3 rear wheel by removing the screen. and that is to tight to tell if it was just a good dyno pull. However I did net 9 rear wheel horses with a SLP MAF sensor 2 pulls in row.

dave70

iTrader: (2)

i heard the stock maf dosen't hurt airflow till around the 500 hp mark everyone has a diff. story to tell

natronathon

when i bougt mine there was no screen, i bought it used, so maybe the previous owner took it out, either way ive had no problems because of it.

Mizfit MotorSports

iTrader: (11)

Just wanted to say that when I put my headers and duals on with the 02 sims car threw no codes for about a week then as I was driving the SES light poped on and has been on for about 3 months. 2 weeks ago I put a lid on and descreened my MAF. A week after doing this my SES light went off and car seems to run a bit better. Could be do to lid or the computer either learned how to work with headers after 3 months or computer was helped by the descreening. Car is an M6... PS No porting MAF- Don't screw with it, not worth it, but descreening is ok and maybe even helped!!

badjuju342

iTrader: (3)

Just for the record, I am not ported MAF ends , I am a man! I guess I could be shiny and cute , though

LiquidFire350

iTrader: (8)

badjuju342

iTrader: (3)

Thank you , thank you , I'll be in Nashville all week!

LSWannabe

I recently put my lid on. I didnt descreen, I did do the FRA though. I'm leaving the screen for a "backup" to the filter. The screen had 2 little fuzzy things on it when I did my lid, so it appears that sometimes things sneak around the filter. I did the FRA because I was disgusted when I saw how little space there was to take in air from under the front of the stock lid. I'm just going to stick with paper filters and change it whenever I change the oil since their only 7 bucks. You guys say descreening frees up a little power, it's probably true. I wont do it because nothing restricts the intake air more than the air filter. And the power gain wouldnt win a race anyway.

...and I know the FRA wont win a race either. I told you why I did that.

camaro98z28

Really? I've descreened mine back in 99 because I had a dry NOS kit.. Mine still works great

racer88

You will be lucky if you even get a 2 HP gain from it. I descreened mine, but noticed nothing. It's the throttle body you may want to port or have ported.

1999 SS #4526

These "screens" are called columnators and they are in there to stop the flow of air from swirling as it goes across the actual MAF sensors. In the never ending quest for HP and bragging rights, and the flow design of the MAF not being a detriment to emissions, one would think that GM would use another design if there were any more than a neglible flow restriction into the TB. Things that make you go hmmm.

blkZ28spt

Yeah, cause we all know that the LS1 makes the power it's rated. If they wanted more "bragging rights" out of it they wouldn't have underrated it so bad, or put "airflow silencers" in the lid. Fact is, they did. Why? Mostly we blaim it on the Vette.

Joker # 9

iTrader: (1)

Descreened mine between dyno runs, gained 4 rwhp, it leaned it out a little and thats where the gain came from.

blkZ28spt

But the question on something like that (or a MAF replacement for, say the SLP) is did the car richen back that little bit over time? I've seen people who did it and it leaned it out right at first but it didn't stay that way and ended up netting nothing. The MAF, IMO, is just too tricky/touchy and small gain limited to mess with.