Any reason not to go back to blow through maf setup?

[240z4u]

Kicking around the idea of going back to a blow through maf setup. There just isn't enough room to plumb a maf in properly with the 6boost manifold and HX35 in my engine bay. It would be 100x easier to go to blow through. If I do blow through, Ill be doing an exhaust setup for my catch can.

Now, I have been draw through for a few years, and honestly don't remember why I changed back. Is there any reason I shouldn't do blow through setup?

Also, does the maf have to be on the cold or hot side of the I/C to work correctly?

Thanks.

Evan

[robbie2883]

for the car to run correctly on a blow through setup you need to have the maf after the IC (if it reads IAT's) and also needs to be after the BOV

[240z4u]

Okay, that is just like I had it years back.

Evan

[Carl H]

only reason i can think not to is that occassionally i'll have to pull the maf off and reseal the cover as it tends to pop off with higher boost pressures.other than that my car has been in the blowthru configuration for years now.

[robbie2883]

just out of curiosity, other then room for fitment, is there any real reason to go to a blow through setup? i mean i understand that the closer to the TB the less area for leaks to pop up and mess with afr's.....but i mean other then that. why?

[240z4u]

One big deal for me is the ability to drive to safety with a coupler blown off.

I would stay draw through if everything fit in the allocated space better honestly.

Evan

[Darius]

Best reason is that the blow thru MAF eliminates the need for BOV recirculation.

[robbie2883]

that's, true...forgot about that! but i like the quicker spool after a shift! LOL

[Darius]

Ok I'll be honest:

BOV sound>>>>not bogging

[Cjmartz2k]

Ricer

[Darius]

I'll admit that I sometimes wish I had a loud, unrecirculated BOV so I could blow it off and scare little kids off their bikes.

[l0nestar]

I'll admit that I sometimes wish I had a loud, unrecirculated BOV so I could blow it off and scare little kids off their bikes.

Isn't that what the 'screamer' pipes are for??

[Cjmartz2k]

Isn't that what the 'screamer' pipes are for??

Ricer



Screamer pipe are for boys with stock turbos that wish they had something big and wastegated

[robbie2883]

HAHA!!! i have always LOVED my hks's....but after driving this for a little bit with a recirc'd greddy rs i've grown to LOVE how quiet this car is....nobody knows jack....unless i open the exhaust cutout...then she screams!!! LOL

[240z4u]

My car sounds nothing like stock, the forge BOV that I have is VERY freaking quiet. I doubt anybody would even notice it vented to atmosphere.

Thanks guys.

[Yellow4g63]

If u go to Blow through with the lightning or the newer slow mafs the install will be easy and clean since they have those flanges you weld onto your intercooler piping.

[themadscientist]

Ricer



Screamer pipe are for boys with stock turbos that wish they had something big and wastegated

Ah, but when you vent through the hood and throw 3 foot fireballs on a decel load-up, it's pretty friggin cool. It scares the s*** out of the bosozoku too which is a public service.

[240z4u]

If u go to Blow through with the lightning or the newer slow mafs the install will be easy and clean since they have those flanges you weld onto your intercooler piping.

I was hoping you would pipe up.

How did you scale the MAF since you went to the lightning setup? I know the setups would all have a bit different scaling but someplace to start?

evan

[Cjmartz2k]

Ah, but when you vent through the hood and throw 3 foot fireballs on a decel load-up, it's pretty friggin cool. It scares the s*** out of the bosozoku too which is a public service.

Ahh yes!! New Years fun! It would be more of a service to just take a deuce and a half out on town and drive over the little bastards though

240z4u--I've heard some people say that blow thru isn't as adaptable as draw thru to changing weather conditions and new mods to the engine. Something about the i/c messing with how much the air cools down the hot wire and it not changing as much as ambient does outside. I don't know how much truth there is to that though. Just mentioning it.

[240z4u]

Anyone know what the lightning element in 2.75" pipe would be good for HP wise?

Evan

[Carl H]

also for those with big nasty cams it helps stablize the cam idle...my car idles like glass with just a hint of cam note.

[wrgibson]

I'm sure this has been covered somewhere but, is there any tuning needed when goiing to a blow through setup? I wouldn't think so considering the MAF is still just metering air from a different location, but I'm not sure.

[240z4u]

Yes you have to retune for it, there are a lot of variables such as turbulence and air temp that can throw everything out of whack.

[robbie2883]

I'm sure this has been covered somewhere but, is there any tuning needed when goiing to a blow through setup? I wouldn't think so considering the MAF is still just metering air from a different location, but I'm not sure.

air density, temp, ect all change on the cold side of the IC so the maf will be reading a little different, not to mention different turbulence characteristics and so forth. so basically...yes...it'll need to be tuned

[Cameron]

ok i didnt want to make a new thread for my question seeing as it kinda pertains to the topic of this thread...

Anyways, I am getting ready to do my intercooler piping on my RB. first off i have a greddy intake, Q45 TB and a Q45 Maf.

My question is, should i run the 3.5in IC piping off the Q45 TB down to the maf, and then 3.5in from the MAF to the Intercooler reducing down to a 3in coupler to attach to the intercooler? the reason i am thinking that is cause i dont want to run 2.5 inch (standard size IC piping) then have to expand up to 3.5 inch for my q45 maf, because wouldnt that cause turbulence? wouldnt it be better to run the same size pipe as the q45 maf and the Throttle body? or does it matter?

also another question, for anyone using a q45 maf, what did you do for a maf adapter to bolt up to the intercooler piping? i know one side of the maf can be handled with a coupler, but the other side has the 4 bolt holes.. what should i do for an adapter?

thanks.

[240z4u]

Cameron, feel free to start your own thread. There are gonna be lots of opinions on this one.

FYI, the Q45 sensor doesn't meter as much air as the z32. I wouldn't use it.

[Yellow4g63]

I was hoping you would pipe up.

How did you scale the MAF since you went to the lightning setup? I know the setups would all have a bit different scaling but someplace to start?

evan

LoL I just used a VQ table someone made for the lightning maf. The conversion numbers that were given in this thread is a good starting point tho it has the voltages n stuff. I had someone make a new VQ table with the info but haven't tried yet. As for HP with the 2.75 pipe I'm not sure, when I looked into it most of the mustang guys were running 3" IC piping. I'm running 2.75 on mine tho.

[240z4u]

Yellow, I take it your not using a PFC huh?

[Yellow4g63]

Not anymore stock ecu with a Nistune board.

[240z4u]

Not anymore stock ecu with a Nistune board.

Yeah, you can just use the VE tables then. I see.

Thanks!

Do you know what kind of power it is good for in a 3" pipe?