5.0 MPG

this is probably an easy question but which one should be bigger in mm? The MAF or the TB?

Mustangkiler

Maf, the bigger you go the more top end because your increasing volume and decreasing veloctiy and vice versa.

dudeboy

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The MAF and TB don't need velocity to work

Bigger is better.
Cost becomes an issue with going super big though...


The MAF should be a little larger than the TB.
You don't want the MAF to impact flow... that is the job of the TB.


jason

5spd GT

It would be more ideal for the MAF to have a slightly larger area (aka. cross section), than the throttle body.

Judging by milimeters is not always 100% accurate. A 75mm MAF may flow less than a 70mm TB, and vice versa.

Mustangkiler

Ok dudeboy you have fun with your 90mm maf and 89mm tb on a stock motor and wonder why you lost all ya bottom end.

nitrous_bob

maf, and don't go too big on all of it like most poeple or you WILL GO SLOWER

to give you an idea ? check out the racecar of livernois motorsports....it makes 2500 hp and they use a 100mmtb on it , so when you see 1/2 the street cars that wanna bump to an 80....they are killing themselves and being retarded

70-75mm maf, and 65 tb will cover you to about 400+ hp

dudeboy

I have no idea how to respond to that...


Please explain to me WHY velocity is needed at the MAF/TB.

My stance, which I will hold, is that an increase in velocity at a specific point in the intake, is a sign of a restriction.
The venturi of a carb uses velocity to create a pressure drop. Velocity here is a necessary evil.

Why create a restriction when it isn't needed?



Bob,
Most claims I have seen from folks trying larger MAF/TB.... have shown they go faster....
Be carefulcomparing a 2500hp motor to our street 302/351w's....



How does a restriction create more power?
How does a restriction increase VE?

jason

Bobert

Well said,.

93StreetFox

i run a 76mm maf and a 70mm tbody, im happy with the setup.

nitrous_bob

i don't how i got pulled into this...but

1) i don't see it as a restriction first off, if you don't NEED the air, it doesn't do anything unless it's packed in (like a blower/turbo)


2)and most of the claims i see are guys w/ stock heads and cam, who put an intake on and say they run 12's w/ thier 3.55 gears and street tires, so claims don't mean $hit , i have yet to see it happen personally and i have played this for a while now , i bought my first 5.0 in 1990.

as far as comparing it was to make a point. "x" amount of air is needed to make "x" amount of hp , and it goes up exponentially as you gain hp. if 100mm tb works on a car making 2500, how big is needed on a 300 hp street car ?

barring all other restrictions, yes you'll go faster, but to elimintae those other restrictions means swapping out the heads and intake. your not dealing w/ a stock car anymore now.

and like i said... all it needs is a 75/65 and it's fine, show me a car that went faster when the conditions were the same using bigger. you won't be able to