How does ECU calculate fuel/timing cells?

soldave · 07-17-2010, 05:33 PM

Just curious about this one. I know the ECU will probably use rpm on the horizontal axis of its timing and fuel maps, but what does it use for "load"? I'm guessing it's either airflow (calculated through the airflow meter, maybe measured in g/rev or similar) or manifold pressure, detected by the pressure sensor.

If it's the latter then it would mean that if your pressure sensor isn't reporting the right voltages, your timing and fuel maps could be way out when you're driving, right?

RETed · 07-18-2010, 05:19 AM

Primary load sensor is the airflow meter.
The boost sensor is a secondary load sensor.

I can't confirm if yours (Kouki) is the same as the earlier Zenki programming, but...
Fuel is only modified under "0".
Once into + boost, it only modifies ignition timing.
This is for Zenki stock ECU's.

-Ted

soldave · 07-18-2010, 06:09 AM

Thanks for that Ted

07-17-2010, 05:33 PM	#1
soldave Rotary Fanatic Join Date: Jun 2010 Location: Okinawa, Japan Posts: 134 Rep Power: 15	How does ECU calculate fuel/timing cells? Just curious about this one. I know the ECU will probably use rpm on the horizontal axis of its timing and fuel maps, but what does it use for "load"? I'm guessing it's either airflow (calculated through the airflow meter, maybe measured in g/rev or similar) or manifold pressure, detected by the pressure sensor. If it's the latter then it would mean that if your pressure sensor isn't reporting the right voltages, your timing and fuel maps could be way out when you're driving, right? __________________ Big in Japan: soldave.ismysite.co.uk

07-18-2010, 06:09 AM	#3
soldave Rotary Fanatic Join Date: Jun 2010 Location: Okinawa, Japan Posts: 134 Rep Power: 15	Thanks for that Ted __________________ Big in Japan: soldave.ismysite.co.uk