I need to know if the timing for all the OBDI & II compliant B-series have the injection based on the distributor/cam timing, or is it crank based. Also how is it read off the cam/distributor if it's read there. Also is there a delay, or does it just pulse the injector when-ever it hits that particular point?
Sorry never really worked with OBD stock ECU's.

 

I don't know the specific answers to your questions, but I do know the ECU controls the pulse width and timing of the fuel injector pulses. At a minimum, engine temp, throttle angle, map, and barometric sensor readings all play a roll in supplying the ECU with the information it needs to control the fuel delivery.

 

Thanks for the info. I knew all that already I'm trying to figure out how the stock ECU does it, and write it up in an equation form. I need to know how & when the ECU determines is the appropiate time to pulse the injectors. On my ECU you'll be able to adjust the pulse timing to an effect. Thus creating a way to alter the mixture to your needs. This will also allow more space for different styles of IM and injector types to work more efficiently, but I need to find out how the stock does it first so it can be straight plug-and-play.

 

From my 'crappy' manual....

"The distributor contains the TDC, Crank, and (post '93) CYP sensors.

The CYP detects the position of the #1 cylinder as the base for sequential fuel injection to each cylinder, whereas the TDC sensor serves to determine the injection timing for each cylinder. The CKP sensor determines the timing for fuel injection and ignition of each cylinder and detects engine speed. The TDC sensor is also used to detect engine speed to read out the basic fuel injector duration for different operating conditions."

 

Thanks for the info. I have another question for you too. Does it work on just constant 5v pulses or is it voltage sensitive? Also the firing order is 4,2,1,3 correct?


[Modified by tzsir, 7:11 PM 2/5/2003]