Adaptronic, what connections to fuel pump and circuit opening relays?

[TERRA Operative]

I'm currently working out all the connections required to make a patch harness to go from an Adaptronic to the stock AE101 4AGZE loom.
I have everything pretty much worked out, except for the fuel pump relay and the circuit opening relay.

How are these usually connected and how do they operate in a stock system? I want to get them as close to stock operation as possible.
The fuel pump relay seems to switch a resistor in and out of the circuit. Is this for two speeds? (prime and full pressure?) and the circuit opening relay, does that just turn on whenever the car is cranking and/or running?

Any help would be great.

[trdee]

i thought the circuit opening relay switched on when you turned the keys to ignition?

[wilbo666]

For the COR, this thread is relevant:
http://www.toymods.org.au/forums/showthread.php?t=18471

The stock ECU (or AFM) grounds a pin the COR to turn the relay and hence the fuel pump on. The Adaptronic can have an output configured as "Fuel Pump" use an output configured as that


As for the Fuel Pump Resistor, I believe that the ECU to GNDs a pin on the relay to place the resistor in series to the fuel pump to reduce the voltage to the pump to slow it / make it more quiet.

I don't have a full description of the 'control" but the autoshop101 documents says it is based on engine load & rpm.

http://www.autoshop101.com/forms/h22.pdf

You could work out switching points by running the fuel pump (Engine off) with & without the resistor in series & applying pressure to the fuel pressure regulator (to simulate the boost that will be run) and then measuring the return fuel flow to the tank.

You could then working out given your injector size / flow required points to switch the resistor on/off.

That said 99% of people ditch the Fuel Pump resistor and never look back.

Cheers
Wilbo

[TERRA Operative]

Awesome. I hoped that was the case with the COR. I'll do as you suggest regarding the output.

I'll probably monitor the resistor relay to see when it is on and off with the stock ecu, but if I just set the Adaptronic to switch the resistor into the circuit on idle, decel and maybe cruise it should work fine.


Oh, is the cold start injector controlled by the stock ECU? I don't think it'll be necessary here in sunny Queensland, but I can't find it on the ECU pinout.


Now if only the e420c had a couple more outputs... I could replicate the cat converter temp warning too. Maybe a voltage switch could do the job if I can be bothered.

[roadsailing]

Oh, is the cold start injector controlled by the stock ECU? I don't think it'll be necessary here in sunny Queensland, but I can't find it on the ECU pinout.

its controlled by a thermostat and nothing else from memory, and it is totally necessary even here in sunny Melbourne, as is the circuit opening relay.

[TERRA Operative]

I'll probably leave the cold start injector in, until I decide to find a smallport manifold to hook up the planned W2A intercooler, then it just won't get reinstalled.

[Cuzzo]

its controlled by a thermostat and nothing else from memory, and it is totally necessary even here in sunny Melbourne, as is the circuit opening relay.

The cold start injector is wired to the brown temp sensor on the back of the head. Not sure if either returns to the ecu though.

[Drifty Midship]

Cold start enrichment is controlled by the adaptronic by adding a trim to the opening time of the regular injectors based on the coolant temp... making the single csi redundant.

[JP]

you're going to have a challenge tuning the fuel maps of the adaptronic if you retain the fuel pump resistor functionality. The injector deadtime changes with fuel pressure and if you dont have a dedicated fuel trim table allocated to be active when the pump is at low speed you map will be very messy, the transition points will also be almost impossible to get acting like a stock ecu with the adap.

The adaptronic has a single deadtime setting, you can't set it up in a table or span it v's fuel pressure or voltage.

Just run the pump at full speed.

[oldcorollas]

will the fuel pressure change when the pump slows? surely it would slow when the actual rail pressure requiresments are low in terms of pressure and volume, and will not affect it much?

[The Witzl]

I'd say JP has had experience in trying to use the fuel pump resistor with an Adaptronic.... so i'd listen to what he says.

[thechuckster]

Oh, is the cold start injector controlled by the stock ECU? I don't think it'll be necessary here in sunny Queensland, but I can't find it on the ECU pinout.

don't bother with it - disconnect plug at injector and ignore. Location is good for IAT when you delete the factory ECU.

[TERRA Operative]

If the resistor is only switched in under low load, idle etc, wouldn't the pressure stay the same as as full pump speed as the majority of the fuel is flowing back to the tank through the regulator anyway?
Can the Adaptronic switch an output when the ECU switches to decel or idle maps?

I don't mind if the resister is used or not at the end of the day, but it would be nice to keep the pump quiet at idle etc. It's only one wire to connect it up, so I guess I could just try it and if it doesn't work, then I end up with one spare output to use for something else.



Also, with the stock igniter, it uses that damn addressing system so the norm is to just replace it with aftermarket igniters.
What if you hooked it up with a few diodes, like the below picture:



That way, when output one is activated, the pulse is sent to just the IGt pin and the ignitor pulses coil one.
When output two is activated, the pulse is sent to both the IGt and IGd pins, so the ignitor will pulse coil two.

Will this work? Or am I missing something simple (as is usually the case.....)
If this works, it'll allow me to retain the stock tacho signal to the cluster and not have to stuff with the ignition system.

[The Witzl]

Just use separate ignitor (microtech X4 is a good one to use!!)
Then you can either use a couple of diodes and shit to make a "combined" tacho signal.... or set another output from the Adaptronic as the tacho signal.

[TERRA Operative]

I've got one of those Mitsubishi 2 channel tacho modules here. I'm just trying to keep the wiring as stock as possible. I'm a bit pedantic with the wiring as it's hard to find spare looms and I've only got two spare dash looms and one spare MAP 4AGZE engine loom.

The Microtech igniter could be an idea, I should still be able to get them cheap, and the X4 worked quite well on my mates Mazda 323. Do they do a 2 channel one so I can retain the stock coils?