ecu compatiblity apex'i powerfc and other q's vrg3 look here

[azn2nr]

did you email him back to clairify???

[scuzzy]

did you email him back to clairify???

I havn't had time at the moment to fire him off another email. It's the weekend in australia and he won't get back to me till monday, so I'll send it sunday evening (monday morning there)

I'm wondering if he just mispoke or if he's speaking of how it's tuneable to where it can be set to function on our engine properly.

If he mispoke and the ECU batch-fires on a different set of pins, it might not function on our engine without moving some pins around in the wiring harness.

I dunno, we'll find out soon enough.

[azn2nr]

see if you can fit something in there to the effect of "can it run a car with an automatic"

[scuzzy]

see if you can fit something in there to the effect of "can it run a car with an automatic"

the TCU controls the automatic, all it needs is input from the ECU. If the PnP ECU's maintain factory features, then yes - it can.

[scuzzy]

Allright, in a series of emails sent back and forth - we cleared the confusion.

In short; I (we) had assumed that when Mr. Hall was referring to pins A10, A9, A8 and A7, he was corrosponding those to the pins on plug B44 of the wiring harness. So that Pin A10 would be cylinder 1, A9 - Cyl 2, and down to Cyl 4 (A7

He's referring to the Autronic ECU side. The way they setup the ECU is so that the pins are numbered in order, but connect to the coil in the firing order.

In reality, the pins were connecting in this fashion

A10 = B44:10 (Cyl 1)
A9 = B44:8 (Cyl 3)
A8 = B44:9 (Cyl 2)
A7 = B44:7 (Cyl 4)

Instead of
A10 = B44:10 (Cyl 1)
A9 = B44:9 (Cyl 2)
A8 = B44:8 (Cyl 3)
A7 = B44:7 (Cyl 4)

So when we take the PnP Autronic ECU and plug it in to our wiring harness, the pins that will actually connect to the ECU will be A10 (Cyl 1) and A9 (Cyl 3)

It will function as wasted spark because the Autronic does drive two coils on the 1996 WRX with a single ignition output

the contents of his email were:

David,

The firing order is always 1-3-2-4 on the Subaru engines

The Autronic ECU fire the last ignition output first. So the outputs fire 2 then 1

Output 2 = A8 & A10
Output 1 = A7 & A9

A10 = Cyl 1
A9 = Cyl 3
A8 = Cyl 2
A7 = Cyl 4

So in one engine cycle, this is how it all works,

Output 2 fires Cylinder 1 and a waste spark on Cylinder 2.
Output 1 fires Cylinder 3 and a waste spark on Cylinder 4.
Output 2 fires Cylinder 2 and a waste spark on Cylinder 1.
Output 1 fires Cylinder 4 and a waste spark on Cylinder 3.

Ray.

just waiting to get the mulah to buy mine.

[scuzzy]

Taking another look, this is where vrg3 needs to step in.

I need to know if this is a FSM discrepancy or something else.

The names of the plugs have changed over the years, it seems, multiple times.

Plug B44 refers to the 1996 WRX ECU's plug. it has 26 pins. Our plug with 26 pins is F47
so
B44(WRX) = F47(Legacy) (26 pins)
B96(WRX) = B56(Legacy) (16 pins)
B95(WRX) = B58(Legacy) (12 pins)
B43(WRX) = B48(Legacy) (22 pins)

Looking at the Legacy FSM, Page 298:


F47 has 26 pins, Pin 1 starts at the top left and goes to the right.

Looking at the 1996 WRX pinout.


It's reverse.

It's almost as if we're looking INTO the ECU's pins on the WRX, and we're looking INTO the wiring harness pins on the Legacy.

either way, this shit is getting more confusing by the minute. if the pins are reverse between model years, that'll fuck everything up.

[vrg3]

Cool; it sounds like this is all a non-issue now... I had forgotten that later-model overseas WRXes were waste spark.

The names of the plugs have changed over the years, it seems, multiple times.

Yeah, just refer to them by which size they are (26-pin, 22-pin, 16-pin, or 12-pin).

Looking at the Legacy FSM, Page 298:

This is from the wiring diagram, and is drawn looking into the connector on the car.

Looking at the 1996 WRX pinout.

This is from the I/O signal chart, and is drawn looking into the connector on the ECU.

It's almost as if we're looking INTO the ECU's pins on the WRX, and we're looking INTO the wiring harness pins on the Legacy.

Yup.

Everything's fine.

[azn2nr]

wait so they do use waste spark but with pack on plug???

[scuzzy]

wait so they do use waste spark but with pack on plug???

I think they use non waste spark on the factory ECU, one ECU output drives one coil. Autronic's implementation of it is to use two outputs instead of four total to save on the number of outputs, since the difference in performance between wasted spark and individual-drive is minimal (if at all existant)


On another note, if you're NA and considering the turbo swap or using the Autronic ECU in your car, it'll work - the only catch is that on the end of the ECU plugs that connect to the ECU, you have to swap the three pins for the cam and crankshaft sensors with each other.

the sensors are the same (and cost the same, about $250 and $150 respectively) between the turbo and the NA, it's just that the NA ecu is wired differently at the connector.

[vrg3]

At some point they actually switched back to coil packs... Doesn't the 22B have a Diamond coil pack and four plug wires?

http://impreza.wz.cz/historie.html

[Simon Lines]

Hi There,

Did you ever get this unit fitted and working?

Regards

Simon