I know that when I drive normally, the engine goes in the closed loop and considers a signal from O2 sensor. When I go at WOT, the ecu ignores )2 sensor and looks at its memory table. Is that open loop table read-only or the ecu can modify it a bit?

 

In open loop the amount of fuel injected into the engine depends on other signals such as the TP, MAP, and ECT sensors. I think the MAP can be modified with the use of a VAFC or SAFC.

 

What am I thinking about - I have installed some RAM effect into my intake. But waht happens when I go WOT at 6000RPM in the 1st gear (I go slowly so no air is pressed into the intake) and when I go WOT at 6000RPM in the 5th gear (I go really fast and there is much of air pressed into the intake)? Will ecu know that there is bigger pressure and will it modify fuel? Or the ecu will be confused from this?


[Modified by petrv, 2:34 PM 3/17/2003]

 

I'm reasonably sure the ECU will make the necessary adjustments. For example there's a sensor that detects the temperature of the air and converts it to a voltage. As you condense air (the ram effect you're talking about) it gets hotter and thats probably how the ECU senses the change.

I'm not entirely sure though. I just learned exactly what an O2 sensor does to I'm not knowlegdable at all.

 

The ecu also knows the mass of air that is going into the intake?

 

Honda ECU's are PROM Programmable Read Only Memory. So no the ECU cannot modify it, but an aftermarket turing company can. Quoted from page 57 of Honda Engine Builder Hondbook Vol. 1