Alrighty guys and girls.
Putting an ECU into my car, and have come across a problem whilst tuning.
At 5000RPM, 10.5PSi, my AFR (On a wideband 02) is going to the maximum richness of 13:1 (WOAH, thats bad!)
Now, car is running stock fuel pump, stock fuel reg, stock injectors.
Fuel pump is wired up using the fuel pump relay pin on the stock wiring loom, but from what I can gather, there is another circuit in there also, that enables the fuel pump to enter a faster running state. Now, from what I can see from wiring diagrams, this is something like pin 106, but the issue is, I would like to know how the stock ECU operates this.
Does it:
a) Provide 12Volts when the higher state is required?
b) Ground out the wire, when the higher state is required?
I know that this can be tested, but I can't get to the car right now, and won't be able to for a little while, and was just wanting some knowledge on how this setup operates.
Also: At the moment, I would prefer to NOT be going to do the fuel pump direct feed mod that is written in the FAQ section. So please, don't mention it.
And don't mention, "get a bigger pump" etc as this isn't the pump, or fuel systems limit.
The stock ECU, at the same boost pressure sees AFRs around 10.5:1 - 11:1 so it seems to be that the whole fuelling side of the car, I'm not quite understanding (Electrically on the fuel pump itself)
Any help on how this system works?