De-screened MAF vs Ported MAF
Thread Starter
12 Second Club
Joined: Apr 2002
Posts: 680
Likes: 0
From: Cave Creek, AZ- Canada Also.
De-screened MAF vs Ported MAF 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?
On The Tree
Joined: Aug 2002
Posts: 187
Likes: 0
From: Louisville, KY
Re: De-screened MAF vs Ported MAF 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
Re: De-screened MAF vs Ported MAF 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
Re: De-screened MAF vs Ported MAF </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>
<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>
Launching!
Joined: Jun 2002
Posts: 214
Likes: 0
From: shreveport, L.A.
Re: De-screened MAF vs Ported MAF 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?
Trending Topics
Staging Lane
Joined: Jul 2002
Posts: 77
Likes: 0
From: LI, NY
Re: De-screened MAF vs Ported MAF 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.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Apprentice
Joined: Jul 2002
Posts: 308
Likes: 0
From: Canada
Re: De-screened MAF vs Ported MAF </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.
<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.
TECH Fanatic
Joined: Oct 2002
Posts: 1,068
Likes: 0
From: Seattle,Wa.
Re: De-screened MAF vs Ported MAF 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.
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.
Re: De-screened MAF vs Ported MAF </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.
<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.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: De-screened MAF vs Ported MAF </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" />
<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" />
