G
Guest
·I have always wanted to monitor the ignition timing advance/retard on my car. With OBDII cars it's dead simple, but no such luck for us. This feature would let us optimize fuel grade, see when we get pre-ignition (by monitoring retard) and increase boost with more safety.
How do we make this thing? Anyone seen one available we could purchase? Standalone is not an option for me.
I've looked through the articles on how our ignition works, and I think I got the grasp of it.
(page 9 and up, page 11 very usefull):
http://www.cygnusx1.net/supra/library/techarticles/h23.pdf
The easiest way I've come up with, is to use the G2 hall effect sensor, and then via inductive pickup on #1-6 spark plug, run it into a processor and calculate the timing.
I don't like the inductive pickup much, so we can use the IGT output line, and have the processor look for the first output after the G2 goes high, and time that relative to RPM. The processor would have to disregard the next five triggers after this. I'm no programmer, so I'd have to ask my friends if that is a problem.
Alternatively, I could just get a RS-232 data acquisition boards (they're cheap), and feed the input into the computer for display, and data logging. It would be nice to have a stand alone unit though.
Any ideas, inputs, nudges in the right direction? Just kind of thinking out loud, so feel free to throw out suggestions my way.
How do we make this thing? Anyone seen one available we could purchase? Standalone is not an option for me.
I've looked through the articles on how our ignition works, and I think I got the grasp of it.
(page 9 and up, page 11 very usefull):
http://www.cygnusx1.net/supra/library/techarticles/h23.pdf
The easiest way I've come up with, is to use the G2 hall effect sensor, and then via inductive pickup on #1-6 spark plug, run it into a processor and calculate the timing.
I don't like the inductive pickup much, so we can use the IGT output line, and have the processor look for the first output after the G2 goes high, and time that relative to RPM. The processor would have to disregard the next five triggers after this. I'm no programmer, so I'd have to ask my friends if that is a problem.
Alternatively, I could just get a RS-232 data acquisition boards (they're cheap), and feed the input into the computer for display, and data logging. It would be nice to have a stand alone unit though.
Any ideas, inputs, nudges in the right direction? Just kind of thinking out loud, so feel free to throw out suggestions my way.