Quote:
Originally Posted by MilesPerTank
May as well just multiply it by 60 (seconds) and display it as an RPM. We can see if its correct pretty quick.
|
It's worse than that (and rpm has to wait). You have to factor in the number of cylinders, weather or not it is TBI or MPFI, if it is bank fire MPFI, or if there even exists a correlation between the number of injector pulses and the number of engine revolutions for a particular vehicle. The nice thing about trying to deduce RPM from the injector signal is that it simplifies hookup, but I really don't know at this point how may cars it won't work on, and we have to ask some unintuitive questions during setup.
If Yoshi is right though, we will need to make sure we get the number of injector pulses right, because there is a mechanical delay in opening the injector (but no mechanical delay in closing the injector?!?)