OneWheelPeel

iTrader: (1)

I'm getting ready to install the boost control kit for the PFC and I've got a question. The instructions I have are in Japanese and I can't find and translation online.

There is one figure that shows the short electrical connector plugging into the side of the PFC, and then into something else that looks like the stock MAP sensor.

I'm assuming its the stock one since the supplied 3 bar version plugs in inside the engine bay and is in the lower portion of the same figure...

I'm hoping someone can shed some light on this. Also, if it is the stock sensor, why do you need to plug it there? There is nothing attached to the hose port, unless that is in the Japanese text I can't read...

Thanks all.

vosko

iTrader: (4)

can you post a picture of what you have? the BCK i bought many years ago. map sensor just replaced the stock one and iirc it came with a new harness for the solenoid that plugged in the side of the pfc

OneWheelPeel

iTrader: (1)

Heres what I've got...







So basically whats going on in the upper left hand corner...

vosko

iTrader: (4)

from what you have there. you do not need to plug anything into the side port of the pfc. you can simply replace the map sensor and boost control solenoid like the pictures show. everything should be plug and play

you also have to change the settings in the commander for the apexi map sensor and turn on the bck in etc menu

as far as i know the side port is only for cars that did not have a map sensor stock

OneWheelPeel

iTrader: (1)

Thats basically what I thought too. The very specific mazda graphic was what got me confused. Wish I could read japanese or could have found an english version of the instructions.

Thanks for the reply.

arghx

iTrader: (3)

Do you have a Datalogit? If so, is there any way you can take some logs for me? I have a suspicion that you will need to plug the STOCK map sensor into the side of the PFC using the attached jumper harness. Without that, the boost control solenoid might not work unless you use the work-around that I devised which requires a Datalogit.

Here is what I have observed. With "sequential turbo control" OFF and nothing plugged into the side of the PFC, the boost control duty cycle is stuck at almost 100% and you could get overboost. The work around for that is to turn "sequential turbo control" ON and change the turbo transition settings to a low rpm in the Datalogit software.

What I am wondering is if the PFC is designed so that, with sequential turbo control OFF, it will only operate the boost controller properly if it sees the resistance of a MAP sensor across the pins on the side of the PFC. The easiest way to test my theory would be to log boost control duty cycle with a Datalogit. Log it with sequential turbo control OFF and nothing plugged into the side of the PFC. Log it with sequential turbo control OFF and the stock MAP sensor plugged into the side.

douwe

they not worth the hassle put it on ebay for some reason some people pay silly money for them and buy a decent boost controller!

OneWheelPeel

iTrader: (1)

I do have a Datalogit, but i'm a ways off from getting you anything useable from a log. I'm still running break-in miles. I am also running BNR stage 3s sequentially, so maybe this is not so much an issue?

So you have the same impression I did when I first looked at the figure. I really wish I could read Japanese. Is there anyone who can translate this to answer the question? I'm sure its right there in black and white ... just not in english.

arghx

iTrader: (3)

if you are running sequentially then what I pointed out is not an issue. Are you using the stock precontrol solenoid then? otherwise you will need another 3 port solenoid for the precontrol. You can buy another Apex'i sensor but that is kind of expensive. see this thread: https://www.rx7club.com/power-fc-forum-47/3-way-mac-valve-pfc-boost-control-934156/ you can also buy the connector if you don't want to hard wire it.

The Power FC boost control has some limitations but on sequential turbo applications it allows independent control of the precontrol and wastegate valves unlike say al Greddy profec. So I can tune boost before and after transition using two different solenoids, just like Mazda designed. On sequential setups I prefer PFC control. You have to know how the system works though--I've done extensive testing of it and I've discussed it in multiple threads. The plumbing has to be right and so do the settings.

OneWheelPeel

iTrader: (1)

I was originally going to run the stock one with a manual adjustable restrictor, but that looks like a really good approach, and the price is not bad either.

maybe unrelated, but is MAC also a viable source for the rest of the 2 port solenoids in the system?

arghx

iTrader: (3)

What are you referring to here? The 3-way solenoids used as part of the sequential system? (charge control, turbo control, etc)

OneWheelPeel

iTrader: (1)

Yeah, I realized after I wrote it that they were actually 3 way as well. Basically the high pressure solenoids, something that will be reliable at say, 18psi...

arghx

iTrader: (3)

Honestly, you could run a bunch of those same MAC solenoids. There are other solenoids available but they are more expensive. See this link: http://www.wrxtuners.com/forums/f70/...lenoids-25587/ . The MAC solenoid is used by Haltech, Grimmspeed, and AEM.

There is also an Ingersoll-Rand solenoid and a GM/Delco solenoid, besides the Denso solenoid you have acquired with the kit. Greddy, HKS, and Apex'i all use the Denso solenoid.

You need:

1) turbo control vacuum -- should supply vacuum from the chamber to one side of the turbo control actuator when energized

2) turbo control pressure -- should supply pressure from the chamber to the other side of the turbo control actuator when energized

3) charge control -- should supply vacuum from chamber when energized and compressor outlet pressure when not energized

4) charge relief -- should supply vacuum from the chamber when energized and compressor outlet pressure when not energized

5) precontrol -- duty controlled, supplies boost pressure to precontrol actuator

6) wastegate -- duty controlled, supplies boost pressure to wastegate (you already have the Denso solenoid for this)

descriptions are from memory. you are just running a variation of simplified sequential. the MAC valves are 3-way just like the OEM Mazda valves. There is a common port, a normally open port, and a normally closed.

hsitko

iTrader: (1)

I talked to apexi about this. You are supposed to plug the wires into the side of the ecu and plug your stock map sensor into it. It then becomes an altitude sensor.

arghx

iTrader: (3)

Thanks for passing along the information. Apex'i didn't pu an internal barometric pressure sensor inside the PFC. The stock FD ECU and most every other stock ECU from the 90s and later have one built in. I haven't seen barometric pressure compensation tables for the boost control system so I'm not sure what good plugging the stock one in really does.