Z32 MAFS and blow-through setup

[SloS13]

The Z32 MAFS is made out of plastic. Do you guys think it'll take 15psi of pressure, or will it blow up?

[574-240sx]

PVC pipe takes 200psi and work fine for intercooler piping. I think the Z32 maf should stand up to 15psi.

[D Money]

putting the maf before the turbo is a better idea

[driftjunke]

Run a Blow-thru setup, its more efficient, and more responsive, plus if you blow a IC pipe off, you can still drive your car home. It will blow apart though if you don't use the right coupler. You need a hump hose coupler for each side, and the 4 screw flange that went to the box, grind it off and make it like a straight through pipe for each side. Other wise it will most likely blow apart with flex and boost.

J.D.

[SloS13]

Good advice. I think I lost the thing that went to the airbox, but I can def. order some hump hoses to allow for some flex. haha, we said hump.

The reasons you gave for doing a blow-thru are exactly why im doing it. especially the part about blowing an IC pipe and getting home. I almost got stranded last friday night.

[driftjunke]

What are you doing tuning wise to run 15 psi?

[SloS13]

Not running 15psi yet. I got some 480's in the mail and i'll be tuning with emanage and wideband.

Right now im running 12psi on the 370's which I didnt think was possible, but hey I guess it is cuz it aint blown up yet

[andrave]

yeah if you grind off the 4 bolt flange thing, you can slip a 3" connector over both ends. and there you go. pretty simple.

[daniel240]

not exactly true. i wouldnt run a blow through setup. after dyno testing my mafs as blow through and standard pull through design i noticed a big difference. as a blow through setup the car ran richer and the a/f's were all over the place. as a pull through setup the a/f's were very smooth and consistant. i can even feel a difference in how the car drives. they are not made to be used as a blow through setup on a turbo car. i also went through 3 mafs using them as blow throughs. just something you might want to consider.

[Structure240sx]

like you said in your other thread you afr's are going from 9-11 with the hacked maf which really isnt the best tunning method, jst one of the cheapest. if someone actually has a piggyback to tune then there wont be any problems. go for it jess cant wait to see your numbers

[andrave]

so he is having problems with a blow through hacked mafs? I am not sure you could compare that to running 3" intake piping with a z32 mafs as blow through, with the proper engine management. Not exactly the same concept.

[PMan_S13]

Blow through is pretty inconsistant between cars. It works fine for some and not so fine for others. I would guess a lot of people having problems might have old leaking turbos. Oil on the maf will screw up the readings. But that is just a guess. Take that as you will. Mine works fine and made more power and has quicker response.

Btw, the z32 maf is no where close to the strength of pcv. That plastic is really really brittle. I would use it personally at 15 psi, but I really doubt it would survive more than that (if that). If it broke I would just make a new metal case for it through, so I would push the limits a little. You should really consider using pull through with the z32 or any plastic maf for that matter.

...unless you got some balls

...or a big bank account

...or a stock pile of z32 mafs you just can't get rid of (lol)

[daniel240]

my a/f's were all over the place 9-11's when i ran it as a blow through setup, but when i ran it before the turbo, my a/fs were nearly perfectly straight across the chart. it made a huge difference. i agree, you can fix it with something to tune it with. but i also had 3 mafs go bad on me in the last 6 months running them as blow throughs. the one ive ran before the turbo has never messed up once.

[Structure240sx]

what about that bad turbo you had? any chance oil was getting into the IC pipes?

[daniel240]

no this has been since then with the new turbo.

[daniel240]

i can try to post the a/fs up if i get a chance

[andrave]

the reason they are all over the place from car to car with blow through is probably from the big differences in IC piping.. IE, ive seen guys run like 2" to the mafs and then use a 2"-3" silicone coupler where it goes to the mafs. do you really think thats gonna work???

[daniel240]

yea i made sure i didnt do that. i ran at least 1ft of straight 3" piping before the mafs and i had it about 14'' away from the tb.

[midnightsliding]

can u guys post some pic of your blow through set ups?

[Tx-Sx-FS]

im also interested in this setup...how is it done?? i have a KA24ET setup and was reading around but not sure how its done with all the vacuum lines and what not...i just want my setup to run and be reliable...is it more reliable than just having the bov blow into the atmosphere than back into the system?? HELP!!

[WDRacing]

For the record, just about any MAF, especially if designed for a forced induction motor will withstand 50+psi on either end, pull or push. From pure physics alone, the cylinder is wicked strong.

[Tx-Sx-FS]

can someone please give me a quite brief breakdown of what "a recirculated bov" and a "blow through maf" setup is?? and which is better if im going to be running this setup:T3Super60 .48/.60370cc injectorsSAFCDSM BOVFMIC255 pumpManual Boost Controller

This will be my daily driver that i will just need to be reliable with about 225+ hp to the ground...im thinking maybe 7-9 psi...is this do-able??

[Naro182]

well recirculated bov and blow through maf are two different things.

When talking about a bov theres two options, recirculated and open atmospshere. Recirculated means when the bov vents(too much psi) the air goes back to the intake piping. On a open atmosphere, the air just vents into the engine compartment sorta self-explanatory.

Now with a maf, there is also two options, blow through and pull through. The difference is where you place the maf. On a pull through the maf is after the intake and before the turbo. This is how most cars are setu, including how the 240sx comes from factory. The other way is blow through, people place the maf before the throttle body. There is advantages to both, its just depends on your car and how it runs.

The reason people talk about open atmos bov and mafs is tying together the tuning of the system...

Hopefully that helped a little bit, maybe someone else can clarify it a little better...

[Tx-Sx-FS]

i understand cleary..thanks...but now my question can only be..which is better for 7-9 psi..the recirc or atmosphere...and blow thru or pull?? and possibly a why statement to explain..thanks