99SSragtop

I know the ported MAF will lean out the engine (I have a ported MAF and a stock MAF),but a De-screened MAF with the divider still in place does it lean out the engine also or does it keep it close to stock MAF settings and does it flow like a ported MAF?

99SSragtop

anyone <img border="0" alt="[whiner]" title="" src="graemlins/gr_cry.gif" />

BensZ28

The screen striaghtens airflow and im sure restricts it a tiny bit, if you take it out it will lean out your car because some areas will have more entering air than others. The screen is there so the sensors get a uniform reading, if its not, they can be off(lean). But this doenst lean it as much as porting it from what ive heard

ZULater01

iTrader: (1)

Actually there is no need for the screen on 98-up F-bodies and 97-up vettes, that is why GM took it out for 02 Z06's b/c they realized this. Its in some issue of GMHTP, I can't recall which one though. The screen is made for vehicles such as 94-97 LT-1 F-bodies and GM Trucks, b/c those vehicles have bends in the intake path such as the air enters the air box, bends up and to the left and then to the right into the t.b. well LS1 Vettes and F-bodies have straight intake paths, air enters and goes straight to the t.b....its in GMHTP, so it doesn't hurt it at all, such as lean it out or anything. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Z Yall Later

CamaroSS_2002

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 99SSragtop:
<strong>I know the ported MAF will lean out the engine (I have a ported MAF and a stock MAF),but a De-screened MAF with the divider still in place does it lean out the engine also or does it keep it close to stock MAF settings and does it flow like a ported MAF?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I de-screened my stock maf and left divider in and it still leaned out my car BAD, like 14.1+ at lowest. I ended up going over to Ls1speed.com and buying a LS6/Z06 MAF Conversion for like $150 that comes with an 85mm MAF and harness. It richened me back up and didn't cause any bad side effects. No KR and I run at 26 degrees advanced under WOT.

If I had to do it again I'd just buy the one from ls1speed.com first and if I had problems I'd atleast have a stock untouched MAF to go back to. Now if I have problems with my 85mm I'm gonna have to go out and buy a stock MAF <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" />

<small>[ October 08, 2002, 11:50 AM: Message edited by: CamaroSS_2002 ]</small>

z28fiend

I de-screened, ported and polished mine as well. I don't have an A-4, so no problems there. I haven't had any adverese effects from this. If anything, it gave me a tenth or so. I could tell a good bit of throttle response after I done it. I would suggest that anyone with the M-6 do it. As for A-tap or LS1 Edit. I haven't done that yet. I have no indication that I am running lean?

Colonel

I descreened the TBs on my first Z28 and on my SS. No difference in timing advance or fuel/air was noticed. Porting, however, made a big difference.

arcom

I descreened and polished mine. Thje only other mod I have is a K&N FIPK. The first time out, I had some pinging under hard acceleration but it went away likely as a result of the chip relearning things.

ND4SPD

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by ZULater01:
<strong>Actually there is no need for the screen on 98-up F-bodies and 97-up vettes, that is why GM took it out for 02 Z06's b/c they realized this. Its in some issue of GMHTP, I can't recall which one though. The screen is made for vehicles such as 94-97 LT-1 F-bodies and GM Trucks, b/c those vehicles have bends in the intake path such as the air enters the air box, bends up and to the left and then to the right into the t.b. well LS1 Vettes and F-bodies have straight intake paths, air enters and goes straight to the t.b....its in GMHTP, so it doesn't hurt it at all, such as lean it out or anything. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Z Yall Later</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">All this is true, however you forgot to mention that the GM engineers also did alot of recalibrating (A4 line pressure etc...)to offset any lean condition caused by descreening the MAF on the ZO6. Our f-body's have not been calibrated for this and therefore will not perform in the same manner. I took off my Whisper ported maf ends and retained my stock screened ends.

Fast Eddie's 02 T/A vert.

OK you guys, you are not making this easy. I did the free ram air w/k&n filter and descreened my 2002 T/A, with the A4. I'm now considering putting the screen back in,that is if I can find it.

I did this mod about 3000 miles ago.There was a big difference in throttle response.

I got on it from a dead stop,she was burning rubber for about ten feet and then took off like bat out of he**,even got second gear rubber with the stock rearend gears,broke the rear exhaust hanger.

I don't know if I should put the screen back in or not,I don't want to cause any problems for my new car. Not sure what to do.

99SSragtop

are you pinging?

FastMover

I think Colonel meant to say he took the screen out of the MAF's on his SS and Z not the TB. If not please excuse me.

Jim

Fast Eddie's 02 T/A vert.

No pinging whatsoever. I hope I don't cause a problem for the A4 trans.

98TAauto

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fast Eddie 2002 T/A convert.:
<strong>No pinging whatsoever. I hope I don't cause a problem for the A4 trans.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">taking the screen out really isnt do do squat! You're 100% fine with the screen out. Its the totally ported ends that cause lean issues. With my screen in or out I got the same 02's numbers on atap... with it ported they dropped from .94 down to .88-.90

also a descreened end really isnt gonna give ya but maybe .05-to 1hp is any. Its just the i did a mod so it must be quicker feeling.

Colonel

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by FastMover:
<strong>I think Colonel meant to say he took the screen out of the MAF's on his SS and Z not the TB. If not please excuse me.

Jim</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Oops! Uhm yes, MAFs. <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />

BensZ28

So on a 98 Z28 M6 it would be 'unadvised' to descreen port/polish my stock MAF with no MAFT or autotap?

Colonel

Decreen it yes, just don't port it unless you KNOW it's running too rich. (A better alternative would be a MAFT since you can easily reverse mistakes.)

BensZ28

Yes it would be unadvised? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />