For those of you who want to know what the infamous MAF is and what it is supposed to do check this article MAF Design Discussion - this is a current hit on the LS1Edit mail list - interesting. 
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MAF Design Information
- Thread starter gandolphxx
- Start date
Are you talking about a heated wire mass air flow there gandolphxx? Doesnt everybody know what that is? 
I know I am still not funny.
You know there is an aftermarket MAF available which advertises 15 more HP. I am going to order one next month and will report on how well it does.
I know I am still not funny.
You know there is an aftermarket MAF available which advertises 15 more HP.
I am going to order one next month and will report on how well it does.Good thing your a mechanic,, that way you can fix your engine if it runs leanTexAVfan said:Are you talking about a heated wire mass air flow there gandolphxx? Doesnt everybody know what that is? ?
I know I am still not funny.
You know there is an aftermarket MAF available which advertises 15 more HP. ?
Gandolphxx,
You're funny! Implying that the a MAF is that only way to lean out an engine! (hee hee hee. I've cracking up) 
You're funny! Implying that the a MAF is that only way to lean out an engine! (hee hee hee. I've cracking up)
Geewhiz, I almost forgot...
TexAVfan, please post, or email me, your before and after information. It'd be nice to see the REAL world results from someone that isn't trying to sell a MAF. I'm so sick of the aftermarket company showing the max results. But then never giving you info for all vehicles. You know what I mean? "on a '79 honda civic we got 21 extra hp (but on a '01 Denali we got 2 extra hp)".
TexAVfan, please post, or email me, your before and after information. It'd be nice to see the REAL world results from someone that isn't trying to sell a MAF. I'm so sick of the aftermarket company showing the max results. But then never giving you info for all vehicles. You know what I mean? "on a '79 honda civic we got 21 extra hp (but on a '01 Denali we got 2 extra hp)".
I wouldn't suggest that it is the "only" way, just one of the easier ways - of course you can always hotwire it to rich.MI_99XPL said:Gandolphxx,
You're funny! ?Implying that the a MAF is that only way to lean out an engine! ?(hee hee hee. ?I've cracking up) ?
1
11H
GUEST
gandolphxx,,,
I have heard all this talk about making MAF mods, or changing what GM placed there and running lean...
What gives?
I have done the following on my MAFS:
- '96 Z-28 LT1 - removed screen - no lean- 5 HP
- '94 Z-28 LT1 - removed screen - no lean-
-'97 Z-28 LT1 - removed screen - no lean-
-'94 T/A - removed screen - no lean-
- '98 S-10 4.3 - removed screen - no lean-
-'99 5.3 Silverado - removed screen - got ses light - MAF Fail - removed ProDyno cold air kit, and put in K&N FIPK with straight shot to MAF ... No light in 35,000 miles - 4 HP
- '00 Silverado - removed screen- K&N fipk - no light - 6 HP
------ I am fully aware of how the MAF works, and wonder if since the new trucks have IAT built in, that this might be causing some issues... I have heard, that guys that have made MAF mods like ends or pulled screens, had leaned out at first, but the PCM eventually brought things back in line...I know the 5.3 is ULEV compliant, and the programming is geared to lean things back, but how is a free flowing MAF gonna lean back if it's not setting codes? I guess if one had problems with maf mod leaning, they could get a maf translator, but it doesn't seem worth the gain... Is this all hype, or what? Like I mention above, I never had a lean issue when I pulled screens out of oem mafs...
Also, I have talked to Dennis Meacham, and he says the Granatelli MAF makes no gains... He had I guess re-constructed the LS1 MAF somehow to make 10 RWHP, but he won't tell ...
11H
I have heard all this talk about making MAF mods, or changing what GM placed there and running lean...
What gives?
I have done the following on my MAFS:
- '96 Z-28 LT1 - removed screen - no lean- 5 HP
- '94 Z-28 LT1 - removed screen - no lean-
-'97 Z-28 LT1 - removed screen - no lean-
-'94 T/A - removed screen - no lean-
- '98 S-10 4.3 - removed screen - no lean-
-'99 5.3 Silverado - removed screen - got ses light - MAF Fail - removed ProDyno cold air kit, and put in K&N FIPK with straight shot to MAF ... No light in 35,000 miles - 4 HP
- '00 Silverado - removed screen- K&N fipk - no light - 6 HP
------ I am fully aware of how the MAF works, and wonder if since the new trucks have IAT built in, that this might be causing some issues... I have heard, that guys that have made MAF mods like ends or pulled screens, had leaned out at first, but the PCM eventually brought things back in line...I know the 5.3 is ULEV compliant, and the programming is geared to lean things back, but how is a free flowing MAF gonna lean back if it's not setting codes? I guess if one had problems with maf mod leaning, they could get a maf translator, but it doesn't seem worth the gain... Is this all hype, or what? Like I mention above, I never had a lean issue when I pulled screens out of oem mafs...
Also, I have talked to Dennis Meacham, and he says the Granatelli MAF makes no gains... He had I guess re-constructed the LS1 MAF somehow to make 10 RWHP, but he won't tell ...
11H
11H,,,
There have been a number of threads on the LS1 boards, pro and con - some issues and folks who have shown little gain, if any and some problems with it running lean and not re-learning.
It is my understanding that the screen serves two purposes, first to even the air flow pattern to improve the accuracy of the reading, and second to prevent catastrophic debris from entering the intake. We had a mamber who was saved by the screen on a K&N install.
It is billed as a "quick" and free gain and tempts folks - that is my only issue. There are also folks who have destroyed the MAF with overexuberant descreening.
Nice to see the dyno numbers that you list.
There have been a number of threads on the LS1 boards, pro and con - some issues and folks who have shown little gain, if any and some problems with it running lean and not re-learning.
It is my understanding that the screen serves two purposes, first to even the air flow pattern to improve the accuracy of the reading, and second to prevent catastrophic debris from entering the intake. We had a mamber who was saved by the screen on a K&N install.
It is billed as a "quick" and free gain and tempts folks - that is my only issue. There are also folks who have destroyed the MAF with overexuberant descreening.
Nice to see the dyno numbers that you list.
1
11H
GUEST
Gandolphxx,,
Well, I have a spare oem MAF, and when I get A-Tap, I will fiddle with it... I am curious to see how the PCM patterns itself, and over how long a period... What is fishy about all the stories, is the "re-learning" bit...
11H
Well, I have a spare oem MAF, and when I get A-Tap, I will fiddle with it... I am curious to see how the PCM patterns itself, and over how long a period... What is fishy about all the stories, is the "re-learning" bit...
11H
11H,,,
I will be curious to see the results also.
My MAF is sans screen since the Whipple install, little different situation though.
I will be curious to see the results also.
My MAF is sans screen since the Whipple install, little different situation though.
MyBigToy
Full Member
I'e red a couple of independent articles on the Granatelli MAF, they indicate there wasn't a significant gain. You'd probably be better off spending the money elsewhere.
MyBigToy
Full Member
Sorry about the typos in my previous post, guess I need to start proof-reading before posting.
If you are interested in the Granatelli, kdub has one listed for sale on page 5 of the "For Sale" area.
If you are interested in the Granatelli, kdub has one listed for sale on page 5 of the "For Sale" area.
james21
Cruise Coord
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How much does the Granatelli MAF increase HP on a 5.3 02'.
And if anyone has one that is willing to sell, I might be willing to buy it.
-James R.
And if anyone has one that is willing to sell, I might be willing to buy it.
-James R.
KenHicks
Full Member
Krytonite time!
Just kidding. I don't buy the laminar flow of a screen. I do buy lower restriction...which would be evidenced at WOT or near there. Normal driving...I doubt you'd see an improvement. Why would you? Flow is limited by the TB...not the MAF.
Lex Luthor
Just kidding. I don't buy the laminar flow of a screen. I do buy lower restriction...which would be evidenced at WOT or near there. Normal driving...I doubt you'd see an improvement. Why would you? Flow is limited by the TB...not the MAF.
Lex Luthor
I've installed vacuum ports before and after the MAF. If I can find a gauge that is sensitive enough and a check valve I'll run some test to see if the OEM MAF causes any restrictions. I could make a water manometer if all else fails.
kw
kw
steelheadchaser
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Kdubb, check with a well stocked motorcyle shop for a two carb mercury manometer. They are used for balancing carbs. If they don't know what your talking about, have them check in the Tucker/Rockey or Parts Unlimited catalog.
Thanks Steel, I'll check it out.
Does it mean, "I fish, therefore I am"?
kw
Does it mean, "I fish, therefore I am"?
kw
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kdubb said:
Yup!If you'd like to spring for some good equipment, Graingers (www.grainger.com) has an electronic digital manometer for $200. I used one for propane carb diagnostics, and I wish I still had it.
On an unrelated note, we discovered during the propane conversion fiasco here in AZ that if the air tube comes off (or has a hole blown in it by backfire) the engine won't run. If you unplug the MAF, the engine computer reverts to a speed-density approach, and runs just fine!
Just a FYI
On an unrelated note, we discovered during the propane conversion fiasco here in AZ that if the air tube comes off (or has a hole blown in it by backfire) the engine won't run. If you unplug the MAF, the engine computer reverts to a speed-density approach, and runs just fine!
Just a FYI