Blow-Thru MAF

So my parts pile is starting to get much larger and I've been doing a lot of research on Blow-Thru set ups and I was curious if anyone has any opinions on this (Erik, Steve and Robert). Would I be able to substitute the Perrin Blow-Thru tube into another FMIC kit. My main reasoning for wanting to reposition the MAF is the fact that I'm planning on running a rotated turbo set up and the intake that comes with the kit I would like to purchase does not have a place for the MAF sensor.

Perrin Blow-Thru Tube: http://www.perrinperformance.com/produc ... category=3

Front Mount I'm planning on purchasing: http://www.importimageracing.com/p/GMS- ... X-STi.html

DISCUSS!!!

make sure the bov or recirc valve is before the maf, all hell breaks loose if not.

Most likely going draw through, feel free to lock this shizznit.

It can be hit of miss, there are so many variables that can cause problems, bends in the piping, heat in the area, BOV as mentioned, any other turbulence. And no real gain, if you want to get away from the MAF restriction switching to MAP is the best option, or you can try the HKS VPC but that can be tricky depending on the application. Especially since its hard to find the instructions in English.

sorry bro, i would not be the one to go to on this, if it was a OEM Q&A i would be alll over it.

now if you would like to put a small block in it, I will be your man!!

Yep, MAP sensors are the way to go. Mine actually measures pressure directly from the ECU which is nice, unlike the stock ECU which measures from a sensor under the hood.

There still has to be a sensor under the hood or in the ECU with a source from under the hood. The ECU itself can't read airflow. MAP's are great when tuned right but tuning is much harder with a MAP sensor. MAF's are simple and work well until they become a restriction.

Mine is directly connected to vacuum from the engine to the Autronic.

map is the way to go. elevation has a tiny bit of effect in what is called a "speed density tune" map tune. works off of iat's, tps, rpm, speed and map pressure. Maf tunes carry all that map has plus the maf itself relys mainly in the mhz of the maf. only problem is condensation can make them read inaccurately. plus your typical maf runs out of reading at roughly 13,000 mhz depending on the brand. depending on a model of engine on your typical v-8 with 8psi will swallow enuf air to run that to 17000 mhz in a heart beat. creating a very lean situation. they also can be a bit laggy on reading air. maf does have advantages. it will smooth the low rpm bucking compared to a map where you have to fill and adjust by hand(this is where most all of the time is ate up tuning a map set up).

DoodieHead wrote:

Mine is directly connected to vacuum from the engine to the Autronic.

That just means the MAP is built into the ECU, a lot of ECU's do this.

I agree MAP is the way to go but I still think tuning it requires more time to get it streetable. MAF can be tuned and drive like a stock car so easy its tough to beat. There are lots of tricks with the voltage issues, a lot of 240 tuners split the voltage and do all kinds of tricks. Obviously at some point they physical restriction and voltages are an issue. For us small displacement guys most will never get to that point. You guys with those big engines though ha ha, it doesn't take much.

I believe the sensor in the Autronic is a 3 bar IIRC.

Well there is a way to "split voltage" as you u call it. U have to rescale airflow. Map. Injecters. And many other things. Takes about 6 hrs if u know what u are doing lol. Every time I would touch up jasons car I had to remind myself to rescale. Jasons gto had to be scaled back 25% and it still maxed out the maf( past 17250 mh)z @ 9 psi

I'm going to be getting in contact with my tuner soon to see what he has to say about blow-thru set ups.

I have successfully used a map-ecu. See it here. It basically replaces your MAF. Works good.


http://www.mapecu.com/