Quote:
Originally Posted by user102
Hi If the amount of fuel going though an injector at any given time also depends on engine load ie reading from map sensor and mpguino doesn't take this into account then how does it do the consumption calculation within 1% accuracy ?
My car has a map sensor on the intake manifold will mpguino still work accurately ?
I was thinking of going the obdguino route however there is no 16 pin obd connector present only the ones i mentioned about previously would a 3 pin to 16obd adaptor cable work?
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By measuring the injector ground, you're measuring how much fuel the injector lets through. You don't need any more information.
MAP sensor and O2 sensors are what the computer uses to calculate how long and much to open the injectors (that, and tables under certain conditions), but you can just as easily read the injectors themselves to see how much it decided to open them.
As I understand it, something like a scangauge can give you a wider variety of information, but these meters read inaccurately under some circumstances because they just use manifold pressure to calculate fuel used, which will be incorrect under certain conditions, ie. lean burn (different AFR) and engine-off-coasting, because they're assuming a stoichometric burn is always happening - that is, making assumptions about how much the injectors actually open. If you're looking to find out how much fuel is being used over a given distance, the best way to do it is to measure the fuel being used directly, and the speed traveled over time, which is exactly what these do.
As for whether or not you can plug any of these other meters into a 3-pin port, that I have no idea.