? difference between a blow through and draw through maf

[Wi Stang]

I'm trying to figure out what MAF to get for my combo that is going into my 95 in the next couple of weeks. Trick Flow heads, intake, cam, and a vortec SQ at 6 psi. I plan on running 42lb injectors. I have figured out that a blow through MAF is located between the blower and the TB. A draw through MAF is infront of the blower, but is there an advantage of going with one or the other? Or does it not really make any difference? I'm just not too sure what is the best route to go.
Thanks for any help.

 

[mootang]

all i know is that one is before the blower and one is after.

try asking in the power adder section.

 

[mo_dingo]

Blow through means the system goes air filter, supercharger, then MAF, then into the TB.

Draw through is air filter, MAF, blower, then TB.
Scott

 

[Wi Stang]

Is there an advantage of one over the other?

 

[DarkMesa8]

Not that comes to mind, there might be but I'm not sure.

I think the important thing is having the meter calibrated properly to understand where it is in the lineup.

 

[OinkAodeOink]

Most of the time it goes like this...
Intercooled Turbocharged cars use blow through mass air meters, and Supercharged ( non intercooled) use draw through meters.
It's more so about application, rather then one being "better" then the other.
Draw through means, the air stream is "drawn" through the meter, and Blow through means the air stream is "blown" through the meter.. Just a different way of sampling the air stream, thats all.


With your Vortech setup, you won't have room for a blow through mass air ( unless you run cold side piping through the inner fender, ect)
If you want to setup your system with a front mounted intercooler, you might want to switch to a blow through meter, wich would also require a blow off valve, rather then the silent Bosch bypass valve Vortech supplies.


SO the simple answer to your original question.. you will need a Draw through mass air meter.. Preferibly a ProM80mm, setup for 42lb injectors, and I would go with the supercharger calibration (adds a tad more fuel up top, for safety)

 

[Wi Stang]

Cool, Thanks for the info Oink. I was figuring on getting a blow through, but now I'll definately go draw through with my setup.

 

[OinkAodeOink]

yea, if it's the standard ol S-trim setup, you have to run the draw through meter.