Blow or Suck

[virus77]

Ive been waiting for the Greddy kit to be carb legal since im in Cali but its laggin and i can wait so im building it on my own. Since im doing it my way ive been thinking blow through. Realistically isnt this a better method since it will give a more accurate reading of how much air is going into the engine. Correct me if im wrong but since im doing it my way i want it to be right.

[red240ne]

you have an S14, so you can just do the hacked MAF:D

and it involves a blow-through setup, so you're taken care of there..

curt

[virus77]

acutally im gonna go with some more advance form of tunning then hacked mafs. Ill be tunning on my wideband, just wanted to know some real good input on if it is actaully better like i think it is.

[Projex240]

blow through is the shizzle--open atmosphere BOV's, and its supposedly more accurate because it actually reads the motors intake rather than whats being sucked through the turbo. IM all for Blow through.

[ziggy682]

I'm running a blow through, and it works just fine.

[virus77]

so how far from the throttlebody, or how far from the intercooler are you guys putting the MAFS, any stalling problems or funny idle.

[C-Kwik]

blow through is the shizzle--open atmosphere BOV's, and its supposedly more accurate because it actually reads the motors intake rather than whats being sucked through the turbo. IM all for Blow through.

The MAF will read the same amount of air regardless of where it is located. In a blowthrough set-up, the air is denser, but slower. In a Draw-through set up, the air is faster, but not as dense. The actual mass of air does not change for a given boost, load and RPM. If any differences in accuracy exists, it wioll not be so much in the volume of air, but rather the time it takes for the measure volume of air to actually enter the motor.

[virus77]

So do you think one type is superior to the other, wont the temp of the air after your intercooler be different from before turbo making blow thru a better setup, what kind do you run

[ziggy682]

so how far from the throttlebody, or how far from the intercooler are you guys putting the MAFS, any stalling problems or funny idle.

Here's a pic of mine. It's a little closer to the throttle body than I wanted to put it, but it works just fine, and has never stalled.

[Jookmasta]

so is blow through just a synonym for hacked maf? obviously it can be done on an s13 or s14 but am i right for assuming that the blow through setup can prevent stalling issues and open bov issues later down in the road?

[huguetpj]

so is blow through just a synonym for hacked maf? obviously it can be done on an s13 or s14 but am i right for assuming that the blow through setup can prevent stalling issues and open bov issues later down in the road?

No it ain't. Blow through means putting the MAF after the turbo, usually near the TB.

Hacked MAF means changing the MAF's diameter in order to inject less fuel than bigger injectors would with a stock MAF

[Jookmasta]

so then blow through is when the BOV is b/f the MAF but the MAF is close to the TB? and basically the MAF doesnt read the air that the BOV releases?

[virus77]

yup

[C-Kwik]

so then blow through is when the BOV is b/f the MAF but the MAF is close to the TB? and basically the MAF doesnt read the air that the BOV releases?

Not exactly. The BOV is not a consideration here. To keep it simple, a blow-through set-up is just when the MAF is reading air that has been compressed by the turbo and is essentially "blowing" air through it. A Draw-through is basically where where the MAF is in a non-pressurized section and the turbo and motor suck the air through it. The BOV can be mounted before or after the MAF in a blow-through. It just has the advantage that it can be run as an open vent BOV if it's mounted before the MAF without seeing excess fuel when it releases air.