C4 (85) MAF Modify
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
Descreening the maf has been covered like 7000 times, some say the screens are to straighten the airflow for accurate measurement, some say it doesn't matter, some say if you take the screens out and throw them away, they will haunt you in your sleep
Safety Car
Joined: Aug 2009
Posts: 3,751
Likes: 276
From: Melbourne, Victoria, Australia
I leave my screen in, just in case a small particle cuts through the sensor wire. If you cut the heat sink like a lot have done, will the MAF electronics overheat?!?
I had tried running without screens, did not notice the slightest change before and after.
Yes these things can haunt you, the more you think about it
.....
If you want performance that you can feel, bolt on a set of long tube headers. Best bang for buck, C4s love long tube headers.
They will knock almost a second of the 1/4 time, I have done the before and after. Standard when I got my c4 ran the quarter in 14.4, next week cold air intake set fuel pressure to 50 psi and long tube headers she ran 13.1
Just don't expect your transmission to last too long......
Last edited by gerardvg; Apr 24, 2017 at 01:13 AM.
Instructor
Joined: Oct 2008
Posts: 193
Likes: 19
From: Stevenston, Scotland, GB
An exchange MAF is about $150, and yes, combined with the other simple L98 mods it does make a difference, but not on its own much.
The screens aren't filters and will still allow dust in there. I give mine an annual blast with a can of carb and choke cleaner. Been like that for about 8 years now.
No problems..
The screens aren't filters and will still allow dust in there. I give mine an annual blast with a can of carb and choke cleaner. Been like that for about 8 years now.
No problems..
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
If it were mine, depending on the level of mods done to the car, I would leave them in place unless you feel that they are limiting the maximum amount of airflow that your engine can take in. (I don't know your mods, if any) Stock cars are probably no where near maxing out the intake snorkel/filter assembly and are more limited by the intake manifold design itself in terms of airflow.
I don't believe the MAF is a limitation of airflow unless you're making big power.
I don't believe the MAF is a limitation of airflow unless you're making big power.
Racer
Joined: Sep 2012
Posts: 491
Likes: 40
From: Mardi Gras City
St. Jude Donor '19
HOW TO BUILD MAX-PERFORMANCE CHEVY LT1/LT4 ENGINES by cotrell & mc clellan : page 54. chart C .maf airflow . stock maf 529 cfm maf with screen removed 711 cfm maf with screens removed and internal surfaces smoothed 750 cfm .
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
After I read through this thread I removed the MAF without the screens and put the screened MAF in place:
https://www.corvetteforum.com/forums...post1584808593
https://www.corvetteforum.com/forums...post1584808593
Instructor
Joined: Apr 2003
Posts: 204
Likes: 9
From: Ocean Springs MS
After I read through this thread I removed the MAF without the screens and put the screened MAF in place:
https://www.corvetteforum.com/forums...post1584808593
https://www.corvetteforum.com/forums...post1584808593
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Instructor
Joined: Oct 2008
Posts: 193
Likes: 19
From: Stevenston, Scotland, GB
Hi..
This guide worked for me. I did all the simple mods and my '87 is running really well, and pulling much stronger than it ever did, so I reckon a combination of all these things does have an effect..
http://www.corvettephotographs.com/c...erformance.htm
This guide worked for me. I did all the simple mods and my '87 is running really well, and pulling much stronger than it ever did, so I reckon a combination of all these things does have an effect..
http://www.corvettephotographs.com/c...erformance.htm
Melting Slicks
Joined: Jan 2008
Posts: 2,054
Likes: 120
From: AZ
The screens can hardly straighten the flow, with nil thickness of any possible linear surface(s). They do, however, protect that delicate sensing wire! There are, in those 7000 discussions, forum stories about damage to it, due to "modifications".
I suspect any lab-sensed increase in flow was due way less due to screen removal and really due to the other interior "smoothing".