[monroe74]

Originally Posted by gteclass

I am a professional automotive tech and I have experience with several aftermarket obd2 scantools.

I think your comments are very helpful; thanks for chiming in.

obd2 does provide fuel pw on most models.

But my understanding is that this is done in a proprietary manner. Which means the data is hard or impossible to get at unless you pay a license fee to the manufacturer. Which I think is what scantool-makers generally do. But not SG.

Im not sure if the device in question uses it, but it should in order to properly calculate fuel usage.

I'm pretty sure SG does not read injector data.

The fuel pressure, while on most cars should be between 40 and 45 psi, is variable

I thought that most (all?) EFI cars have a fuel pressure regulator, to make sure that pressure across the injector is constant.

Some cars run at higher fuel pressure, some lower, making it hard for any aftermarket device to properly work on all vehicles.

But I think that for any particular vehicle, fuel pressure is a constant. Which means that it should only be necessary for the user to enter a parameter which represents the dynamic flow rate for his injectors. (The idea of dynamic flow rate, as compared with static, is that the former takes latency into account.)

That parameter could be found in various ways, including trial and error. But once it's found, it should not be necessary to worry about fuel pressure. It already takes fuel pressure into account. Assuming there is a fuel pressure regulator that holds fuel pressure constant.

uses the factory communication protocols to get data that isnt even supported by obd2

I have a feeling that when these tools show you injector data, the data is delivered via "factory communication protocols." In other words, I think the injector data is not "supported by obd2."