Do Not Remove Your Maf Screen!
Banned
Joined: Aug 2001
Posts: 3,505
From: looking for a flow bench so Brook and I can race
i honestly dont think the MAF is providing enough restriction to matter on a stock car.
sorry, JMO.
until someone has dyno results (after it has be recalibrated for no screen, it will just run a bit leaner without tuning), i say its not even worth the effort.
why is it there? GM bored?
sorry, JMO.
until someone has dyno results (after it has be recalibrated for no screen, it will just run a bit leaner without tuning), i say its not even worth the effort.
why is it there? GM bored?
Registered User
Joined: Dec 2002
Posts: 148
From: Shirley Mass 01464
Originally posted by RedWolf
T.P.I.S.(www.tpis.com), did a write up in thier LT-1 Hint book which says:
Flow restriction for the 1994 Camaro with LT-1.
CFM
test 1 all stock.......................409
test 2 TPIS air filter................428
test 3 remove first air entry
(that little vent behind the
dr head light)..........................447
test 4 drill 7 holes
in the filter cover......................475
test 5 hi flow elbow between
MAF and filter assembly............535
test 6 remove MAF screen........559
test 7 52mm with air foil...........605
test 8 remove air filter lid..........618
test 9 remove air filer base.......726
so as you can see.. removing the screen DOES increase your air flow, according to them.
just thought id share with you all.
T.P.I.S.(www.tpis.com), did a write up in thier LT-1 Hint book which says:
Flow restriction for the 1994 Camaro with LT-1.
CFM
test 1 all stock.......................409
test 2 TPIS air filter................428
test 3 remove first air entry
(that little vent behind the
dr head light)..........................447
test 4 drill 7 holes
in the filter cover......................475
test 5 hi flow elbow between
MAF and filter assembly............535
test 6 remove MAF screen........559
test 7 52mm with air foil...........605
test 8 remove air filter lid..........618
test 9 remove air filer base.......726
so as you can see.. removing the screen DOES increase your air flow, according to them.
just thought id share with you all.
Banned
Joined: Aug 2001
Posts: 3,505
From: looking for a flow bench so Brook and I can race
Originally posted by RedWolf
here ya go
here ya go
mike you amaze me
you bash me all the time
you bash PROFESSIONAL engine builders opinions
you bash their dyno results
you bash my opinons
you bash my track results
but yet- all you have is your opinion and a thoery to EVER back yourself up
. your opinion, thoery and 4 quarters will get you a dollar ANYWHERE you go mike 
Super Moderator
Joined: May 1999
Posts: 4,060
From: Inverness, FL
Here are the numbers I said I would post earlier...
Flowbench measurements on the MAF (Superflow 300).
Measurements were made at 3" and converted to 28" (water).
(B-body) 3" MAF w/ screen = 670 cfm
(B-body) 3" MAF w/o screen = 808 cfm
(F-body) 3.5" MAF w/ screen = 759 cfm
(F-body) 3.5" MAF w/o screen = 979 cfm
Oh, and GREGG 97Z, I don't currently have the Trans Am anymore
Me and a buddy traded vehicles. I got me a red neck 4x4 chevy truck and he got my Trans Am. 
However, I did end up with another 96SS but I don't have the engine in it right now so it is kinda like only 1/2 a car I guess. LOL!
Flowbench measurements on the MAF (Superflow 300).
Measurements were made at 3" and converted to 28" (water).
(B-body) 3" MAF w/ screen = 670 cfm
(B-body) 3" MAF w/o screen = 808 cfm
(F-body) 3.5" MAF w/ screen = 759 cfm
(F-body) 3.5" MAF w/o screen = 979 cfm
Oh, and GREGG 97Z, I don't currently have the Trans Am anymore
Me and a buddy traded vehicles. I got me a red neck 4x4 chevy truck and he got my Trans Am. However, I did end up with another 96SS but I don't have the engine in it right now so it is kinda like only 1/2 a car I guess. LOL!
Registered User
Joined: Dec 1999
Posts: 1,697
From: Petersham, MA
Originally posted by treyZ28
i honestly dont think the MAF is providing enough restriction to matter on a stock car.
why is it there? GM bored?
i honestly dont think the MAF is providing enough restriction to matter on a stock car.
why is it there? GM bored?
First, I'll take 200+ CFM of intake flow anyday I can.
Second, GM puts lots of parts on our car that are not always in the best interest of power....example stock cam, muffler, etc. I think the more important question is why does the '02 ZO6 NOT have the screen?
Registered User
Joined: Oct 2002
Posts: 334
From: Dartmouth, MA
I ported and polished my MAF and I get rough idleing but thats it. I notice more throttle response and actually get better gas mileage then with a regular stock MAF ( I have an untouched MAF that I used to compare). Something else is most likely up with your car. How old is the air filter and what kind is it?
Registered User
Joined: Mar 1999
Posts: 528
From: Vancouver BC, Canada
I've had the the screen out of my MAF for the past 5-6 years as well, and while I don't have any major issues with it, I do have some hidden? ones that I am some what convinced are due to the lack of a screen.
BLM's... Long term fuel corrections...
Sideways, thats a great test you did, but did you notice if your BLM's changed from the MAF switching?
I also wanna do a test like this, as my car runs rather rich... And while there might be other reasons for this (leaking injectors, etc...) I don't feel that there is ANY need to remove the screen and wish I didn't all those years ago...
I also think that the people talking about the Z06's and its lack of screen (I think anyways!!) have to think about how the air duct from the Z06 is... Its straight isn't it?? So it doesn't need a screen to even out the flow... As our ducting goes arounds bends and such, we need something to even out the rough airflow...
I look forward to some testing with a perfectly working stock MAF
Jeff
BLM's... Long term fuel corrections...
Sideways, thats a great test you did, but did you notice if your BLM's changed from the MAF switching?
I also wanna do a test like this, as my car runs rather rich... And while there might be other reasons for this (leaking injectors, etc...) I don't feel that there is ANY need to remove the screen and wish I didn't all those years ago...
I also think that the people talking about the Z06's and its lack of screen (I think anyways!!) have to think about how the air duct from the Z06 is... Its straight isn't it?? So it doesn't need a screen to even out the flow... As our ducting goes arounds bends and such, we need something to even out the rough airflow...
I look forward to some testing with a perfectly working stock MAF
Jeff
Registered User
Joined: Mar 2001
Posts: 2,667
From: SLC, UT
Originally posted by JeffK95Z
I also think that the people talking about the Z06's and its lack of screen (I think anyways!!) have to think about how the air duct from the Z06 is... Its straight isn't it?? So it doesn't need a screen to even out the flow... As our ducting goes arounds bends and such, we need something to even out the rough airflow...
Jeff
I also think that the people talking about the Z06's and its lack of screen (I think anyways!!) have to think about how the air duct from the Z06 is... Its straight isn't it?? So it doesn't need a screen to even out the flow... As our ducting goes arounds bends and such, we need something to even out the rough airflow...
Jeff
But you did stumble upon a HUGE thing... The screen makes a uniform flow across the meter and compensates for all the bends in the tubing... Without the screen you have un-balanced flow across the meter... Atleast in a "typical" setup. A LS1 or WS6 setup is the exception....
