Hi Chaps, Thanks for stopping by, hopefully you may be able to help. I have a Power Excel version of the Power FC for my GTiR. I also have a greddy profec b. I'll get straight to the question. My car has a map sensor but alike the ST185 Celica for example it only provides a signal for the dash mounted gauge. When one buys a power fc and if they want it to control boost then they would have to buy a apexi boost control kit, basically a 3 bar sensor, and a poor looking solenoid. I was quoted a silly price for the kit so hence I will do it myself, electronics degree thankgod. Just briefly Ill explain not using my greddy profec to control boost. If the Apexi is the actual brain then it makes sense to use the brain to control boost as opposed to a third party device however highly I rate it, hence the FC should control.

Now, I have read that some FCs have a 3 pin socket and some have a 5 pin socket which is located next to the fancy 'keyboard socket missing a pin, or a svhs socket with an extra pin!" serial interface port. Mine has a 3 pin socket and uses this solely to input the sensor. The boost control solenoid is then powered by the original factory control solenoid connector, cunning!, good job I never wired a solenoid to the three pins! Incidently if someone wants to know about the five pin, the righthand two pins are for the control solenoid.

Okay, I use a very expensive industrial pressure sensor in digital, it measures upto 10 bar. It will produce a linear voltage from 0v to 5v along its range. I have read that the apexi 3 bar generic pressure sensor measures obviously 3 bar, but more importantly its produces 5v at 3bar - Pls feel free to correct me
! If this is so then my sensor needs to produce the same effective voltage as the apexi sensor. So lets say I run at 1.2 bar (keeps the maths simple); The apexi would produce around 2v (3bar/5v=0.6bar/volt, so 1.2bar = 2volts) depending on tolerances. My sensor will produce about 0.6v @ 1.2 bar (10bar/5v=2bar/volt, so 1 bar is 0.5v, 1.2x0.5 = 0.6v).

So for a max theoretical pressure of 1.2 bar the apexi sensor would produce 2 volts and my sensor will produce 0.6 volts. Therefore there is a factor of 3.333rec difference. I have built a small amplifier with a precise gain of 3.333rec. when my sensor at 1.2 bar produces 0.6v the amplifier output is exactly 2v. Sorted..

The problem I have is: Out of the three pins, does anyone know what is the actual input? Out of three, two will most definately be the powersupply to the sensor. If someone has one and knows how to use a multi meter then it can be measured. If one probe is on a known +ve then the other can locate the ground signal on the FCs 3 pin socket, likewise +ve can be found if one probe is on a known ground, and the other locates batt voltage on the FCs 3 pin socket. The other is the holy grail I search for.

Lastly, I was thinking of ebaying the profec, but If I can get this pin then Ill use the profecs' solenoid for the FC, as I know its very good and the whole deal will cost me nothing.

Thanks for reading - ( I know it was long!)

 

i think your logic is flawed by the placement of the sensor. . . i made the same mistake on my kit. the sensor connection at the PFC is NOT for the apexi 3 bar sensor. . . or for whatever sensor you plan on running that actually views the manifold pressure. that sensor connection is for the stock map sensor from your car. . . you hook it up. . . and stick it to something. its supposed to be an elevation correction. . . though, im not so sure that it works very well.

so, you can hook up this aftermarket boost sensor to your cars harness, tell the PFC how to view it, hook up your profec b to the harness (dont know what modifications that entails), hook up your OLD pressure sensor to the 3pin connection on the PFC, and you have a modified version of the PFC boost control kit.

 

i have the pinouts somewhere here, let me find them. but you are right. the three pin socket is for the boost control kit and the five pin socket is for the djetro powerfc which uses map sensor input instead of airflow meter spliced into the boost controller kit port (with 2 extra pins). let me confirm, hang 5

 

the map sensor + soleonid
http://members.dodo.com.au/paul/docs.../boost-kit.jpg

the real kit
http://members.dodo.com.au/paul/docs...aq/PFC_BCK.jpg

djetro plugin
http://members.dodo.com.au/paul/docs...ro-harness.jpg

 

ok it seems the 5 pin plug is normal but i dont recall seeing a 5 pin plug on my ecr33 powerfc. let me check

 

taken from the powerfc-faq i did:
http://members.dodo.com.au/paul/docs...owerfc-faq.htm

How do I hook up the optional Boost Controller kit?
The optional boost controller kit for the Power FC consists of the pressor sensor, pressure sensor harness and solenoid. The solenoid should be plumbed between your manifold and the wastegate actuator (internal wastegate setup). For external wastegate setup it should be plumbed between the manifold and your external wastegate pressure line. The pressure sensor should be plumbed in parrallel with the factory MAP sensor which is used by your standar boost guage. It can be T'eed into the plumbing with its included T piece fitting.

The pressure sensor has the main wiring harness directly attached to itself, one end plugs into the 5 pin port on the PowerFC. The solenoid piggybacks off the Pressure Sensor wiring harness which leads to the PowerFC connector port. The wiring is shown below.

MAP Sensor
Red = Positive
Black = Negative (earth)
Green = Signal

Solenoid
Pink = Positive
Black = Negative

When the solenoid wiring meets with the Map Sensor harness the colours for the Soneoid change as follows;

Pink = Red
Black = Brown

 

please tread carefuilly as some of the info on my site could be wrong. i tried an airtemp experienment and fried a powerfc board (fixed now tho) so you've been warned. good luck and let us know how you go

 

ok after looking at greenline.jp ive found you can buy all the parts seperately

49C-A002 Sensor Harness 3P
499-X001 Pressure Sensor
499-X003 Solenoid Valve

They list the 3 pin Boost controller kit harness to 415-A013 which is for Nissan
They list the 5 pin boost contorller kit harness to 415-T003 which is for Toyota

I thought the two extra pins were for the djetro kit. It appears you spice into the boost controller kit port for power to the map sensor(s) and then signal goes into cyclinders 3 & 4