choke point
Thread Starter
TECH Enthusiast
Joined: Sep 2003
Posts: 702
Likes: 0
From: Lakeland, Fl
choke point First off let me state by no means am I a real mechanic or engine designer but, you can have all the great larger TB, intake, lid ect... but if you are running a stock MAF what is the point of going to these other parts that flow more air? 
When your stock MAF is 75mm you are not going to be consistant in your air flow into the engine becasue of the restriction. And, as far as I can tell the only real definitive answer with respects to the MAF is that the stock 75mm one works and all the other are questionable. When are we going to get from one of the sponsers a complete package from the lid to the intake that will have consitant diameter for air flow purposses? I may be missing the obvious, so if I am please let me know.
When your stock MAF is 75mm you are not going to be consistant in your air flow into the engine becasue of the restriction. And, as far as I can tell the only real definitive answer with respects to the MAF is that the stock 75mm one works and all the other are questionable. When are we going to get from one of the sponsers a complete package from the lid to the intake that will have consitant diameter for air flow purposses? I may be missing the obvious, so if I am please let me know. 
10 Second Club
Joined: Jun 2002
Posts: 1,884
Likes: 4
From: H-town
the reason that lids, LS6 intakes and ported TBs work is because the stock MAF is not really a restriction unless it has not been ported it self. remember, the best way to flow air with the least resrictions is straight though and that is exacly what the MAF does. anywhere there is a turn the air has to make, there is an improvment to be made.
It's not like you're trying to force a golf ball through
a garden hose. Air is a compressible fluid, so it's really
a series of resistances instead of a hard "choke". The
flow (short of engine pumping limit) depends on the
sum of all of these resistances, and you are reducing
certain of them. Hopefully the most cost-effective
ones first.
a garden hose. Air is a compressible fluid, so it's really
a series of resistances instead of a hard "choke". The
flow (short of engine pumping limit) depends on the
sum of all of these resistances, and you are reducing
certain of them. Hopefully the most cost-effective
ones first.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
The stock screened and unported MAF IS a restriction once the TB has been ported. That's why I run a GMS MAF. The problem with ported or other than stock MAFs is the tuning, not the size. You can correct the tuning (in the cases that it is in fact a problem) with a MAFT, LS1Edit, or other tuning devices.
what colonel said. i think there was a chart on C.I.D. vs. airflow needed or something and showed that a ported stock maf would flow enough for a car with stock cubes, intake work and i believe heads and cam. like it was siad up there, the better and smoother flow is what your want, a ported stock TB will help flow and a bigger intake will help flow into each intake chamber in the head. if you think of it the way your saying then why do u need an air filter with such a huge area, lets say it has about 108 square inches of area but if u have anything other than a ws6 it has that small opening that about 9 square inches. this would be my area of concern cause that is a HUGE difference in area where as from a 75-85 mm MAF its almost negligable area compaired to this opening. it all depends on how much the motor is demanding the air. now when u pop the gas and the motor takes a second to pic up the i would worry about it but all i know is with that stock maf when i touch the gas the rpms shoot up and u can tell its not being restricted what so ever. dont know if i made much sense but i know what i was sayin lol
Thread Starter
TECH Enthusiast
Joined: Sep 2003
Posts: 702
Likes: 0
From: Lakeland, Fl
I may have not stated my question very well. Lets say that your lid has am 85mm opening and you have a an LSX 90mm TB and 90mm intake but the stock 75mm MAF. What is the point of having all of these parts with a larger opening to flow more air when the diameters are not consistant among al of your parts? 85mm to 75mm to 90mm? Will you not just be restricted in air flow to the smallest diameter of the parts that are flowing air to the engine? Which goes to my next question of why should you buy the parts with larger diameters when the MAF is 75mm and using larger diameter MAF's seems like vodoo at best. All of the installers that I have talked to when it comes to tuning tell me that using anything beside the stock MAF for stock cubes is a waste of time. Am I just confused?
A stock MAF is easier to tune,but with the setup your listing the stock MAF would be a resriction.So you would have to look into a 85mm or custom 90-95mm MAF and a good tuner to work it in to the tune.
