Took out MAF screen!
Melting Slicks
Joined: Jun 2001
Posts: 2,565
Likes: 2
From: Chicagoland Illinois
Re: Took out MAF screen! (Vettepartz)
Wow, this post is getting big. I started with my screen in and getting my LTFT's to near zero. Pulled the screen and cut out the dividers. MOST IMPORTANTLY, I blended the cut areas including blending out the ridge left where the screen was seated, I cannot believe that most people leave that ridge there. Did a 2 hour relearn and found my LTFT's were now lean. Reprogrammed the MAF tables by 8% richer and did another 2 hour relearn. LTFT's are now at near zero again and NO SURGING! I have to believe that adding an 8% increase to the MAF table to get zero trims must add something to the overall power. I think that if you start out rich and do this, it will help; but if you start out lean and do it you may hurt yourself if you don't reprogram. Just my thoughts on the subject.
John, I think you hit it on the head!!! :chevy :seeya
Drifting
Joined: Sep 2000
Posts: 1,640
Likes: 4
From: Hayward CA
Re: Took out MAF screen! (tshac)
Thanks for your response kewlbrz :cheers: Vettepartz, I like to learn what you just explained regarding the MAF removal and reprogramming. I read what you wrote and did not understand what it meant. :crazy: what do your abbreaviations LTFT mean. Is there somewhere I can read this on a website. thanks buddy.
Reuben :cheers:
Reuben :cheers:
Le Mans Master
Joined: Jul 2000
Posts: 7,758
Likes: 0
From: Fort Worth Texas
Cruise-In II Veteran
Cruise-In III Veteran
Re: Took out MAF screen! (BodaciousBlue)
bodaciousblue, check out my writeup
http://www.vetteguru.com/mods/howto
http://www.vetteguru.com/mods/howto
Safety Car
Joined: Feb 2001
Posts: 3,569
Likes: 0
From: Greenville NC
Re: Took out MAF screen!
I don't really see it as worth it... for somewhere between -5 to +5 hp gain, or if you buy a MAFT or LS1edit and know what your doing maybe 0-7hp. If you go to your dealer for service and they notice it its going to be the first thing they blame for any tunning issues. And some people (a good number of them) have had issues with it... pinging, surging, tunning. I thought about it when I was adding the Vortex last year, but did some searches and it turned out that most 97-98 owners had little or no issues and 99-00 owners had many more issues... I have a 2000 so I stayed away. The mod causes the car to run a little leaner than stock... a good thing on 97-98s that are set to run rich from the factory... but sometimes a bad thing on 99-00s that are tuned for a more ideal setting, as it can cause them to run lean which may cause loss of hp and/or tunning issues. Of course, if you have a MAFT or LSIedit and know what your doing.. go for it. The same thing applies to MAF ends, but at least that way is reversable.
Le Mans Master
Joined: Aug 2001
Posts: 8,059
Likes: 0
From: Good Ol' NC
Re: Took out MAF screen! (kewlbrz)
hmm should I do this on my 98. I do notice quite a bit of black stuff on my PRT's this ,means if anything I am running rich right ? just got the hypertech havent had a chance to play around with the tuning, would this affect the decision to remove the MAF ? kewlbrz you seem to be the man when it comes to this , what are your thoughts on my situation. ohh and regarding 5/100 here or 5 hp there it does add up and in the 1/4 all matters... :chevy
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
Re: Took out MAF screen! (Speide)
Before all your seat of pants guess's get you all in trouble. The screen is to insure the air coming in is uniform across the plane so the sensors can accurately meter the fuel. Removing it is questionable and you probably won't see any hp change. If you say you feel it I would suggest a tranquilizer before you drive fore your imagination is getting the best of you. With the after market intake systems there wasn't a noticeable power change either way. The total is anywhere form 15 to 22 hp as a complete system and that takes some imagination to feel the difference with a 300 hp system.
[Modified by jimman, 12:28 PM 7/11/2002]
[Modified by jimman, 12:28 PM 7/11/2002]
Safety Car
Joined: Jul 2000
Posts: 3,596
Likes: 37
From: Orange County CA
Re: Took out MAF screen! (jimman)
I don't think it will make much of a difference....But, I will know more this weekend. I took the screen out about a week or two ago, and will be dynoing my car this saturday. I have a good dyno baseline...so this should be a good test to see if it makes any difference.
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Burning Brakes
Joined: Jun 2002
Posts: 1,202
Likes: 0
From: Clarksburg MD
Re: Took out MAF screen! (Charley Hoyt)
I don't think it will make much of a difference....But, I will know more this weekend. I took the screen out about a week or two ago, and will be dynoing my car this saturday. I have a good dyno baseline...so this should be a good test to see if it makes any difference.
Le Mans Master
Joined: Jul 2000
Posts: 7,758
Likes: 0
From: Fort Worth Texas
Cruise-In II Veteran
Cruise-In III Veteran
Re: Took out MAF screen! (jimman)
Before all your seat of pants guess's get you all in trouble. The screen is to insure the air coming in is uniform across the plane so the sensors can accurately meter the fuel. Removing it is questionable and you probably won't see any hp change. If you say you feel it I would suggest a tranquilizer before you drive fore your imagination is getting the best of you. With the after market intake systems there wasn't a noticeable power change either way. The total is anywhere form 15 to 22 hp as a complete system and that takes some imagination to feel the difference with a 300 hp system.
[Modified by jimman, 12:28 PM 7/11/2002]
[Modified by jimman, 12:28 PM 7/11/2002]
Racer
Joined: Aug 2001
Posts: 451
Likes: 0
From: Champaign IL
Cruise-In III Veteran
Re: Took out MAF screen! (kewlbrz)
I would agree that removing the screen is a good thing. Obviously, if they did it for the Z06, there's merit to it.
I'm not so sure doing so is a good thing for the coupe or roadster. When I removed mine, it seemed like my engine started running lean, because I was having problems at high rpms with the engine acting weird. The safest bet seems to be to remove the screen without destroying it, and if your car starts to run lean like mine did, put the screen back in :)
I'm not so sure doing so is a good thing for the coupe or roadster. When I removed mine, it seemed like my engine started running lean, because I was having problems at high rpms with the engine acting weird. The safest bet seems to be to remove the screen without destroying it, and if your car starts to run lean like mine did, put the screen back in :)
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
Re: Took out MAF screen! (StormCrow)
kewlbrz, I know I read it and we've been through this all over the last 3 years and after many dyno runs it didn't make any difference I've tried it myself and the dyno didn't do anything. It's like the old days with putting bigger carbs on when the 350 will only take so much and the bigger carb didn't bring anything further to the party. With the screen in there it still doesn't choke the system off because there is more than enough. If you want I can send you the dyno sheets and you will see at even at the top end it didn't hurt anythiing. Again this is the same discussion we all had in 00, in fact Jim Hall has done a bunch of testing with the same conclusion.
