I have searched NASIOC but its so hard with all the different threads on there to find some quality information. so... those of you running a blow thru setup... explain to me how this works, what it entails and stuff like that. Thanks
Not sure about the EM requirements these days, when I did it you needed a UTEC, although I'm sure that a Hydra could pull it off just fine, and maybe they've found a way to tune around it in OpenECU at this point. You place the MAF on the charge side of the turbo in the IC piping, usually about 12" from the throttlebody. Then you need an ECU that can measure speed density instead of Mass Air Flow. This requires a MAP sensor that is wired direct to the ECU to measure pressure. Those are the basics for the setup, I'd talk to someone that can tune MAP/SpeedDensity and knows what is required for what you want.
I see, so you are essentially changing it from a MAF base to a Speed density.... what are the advantages to doing it like that? i could be wrong but i thought ive always heard that you can make better power with a MAF system compared to a speed density?
Your MAF based system, specificly the boost input to the ECU can only really resolve 21.5psi. With a MAP based system, you are only limited by the MAP sensor's range. A 3bar map sensor will read 3bar of manifold absolute pressure. Or 14.7psi + boost. which will net you about 27 or so PSI, only one cup of coffee today so I'm not doing the exact math on that. A 5 bar, will of course get you to around 54psi.
To elaborate a little bit on that, the MAP sensor will allow you to resolve boost that is higher than the stock boost sensor. The MAF sensor on your car can be scaled and messed with to a certain extent with regards to the tube diameter, but it will be a hinderance at a certain point with regard to measuring mass air flow.
Blow through, you're placing the MAF after the turbo, not before the turbo (like in the intake). Speed Density, instead of using the MAF, you rely on the MAP sensor. You can go with either on the stock ecu. For speed density on the 16bit, utec is needed. 32bit can be done with the Cobb AP (using Protuner). Freon (off Romraider) has released it for the 2004 sti for open ecu. Others guys are converting other 32bit ecus to speed density. Blow through will just require you to retune the maf scaling (which can change loads and such)
