williB said:
i dont know what the F1 pulse width is
BUT i imagin it has to do with spark..so you are going to need a spark sensor circuit..one of those things that clamps on the spark wire will do...
Actually it's FI, and he means Fuel Injector.
stevez said:
RK Nair - several have developed their own engine control systems, presumably with OBD capabilities - and they're sharing the results of their efforts via the internet.
Nobody in the aftermarket actually creates EFI systems with OBD in it. OBD is a regulated specification by the US EPA for emmissions regulations. It's actually quite difficult to create an ECU with all the controls to conform to the OBD II specification. The specification deals directly with detecting emmissions problems, misfires, cat converter failures, O2 sensor degradation. It doesn't care if you have no oil, and you seize your engine, as long as you're not poluting the air.
If you're talking about OBD scanners, yes, there's plenty of homemade ones out there, but that not going to help someone in India at the moment. Since their ECU's do not support OBD.
The problem with this project, is that you would need to actually hook into the existing engine sensors, which are not standard. 3volt return on a coolant temp sensor is different on a Volvo then a Honda. Same with MAP/MAF/MAS sensors. You would be able to get pulse width and rpm pretty easy by tapping into the fuel injector wire and the ignitor wire, but that's about it.
If all you want is the sensor return voltages, the pulse width, and rpm, you can use a simple multimeter with a hertz/pulsewidth feature and a calculator for all of it.
There must be some professional equipment out there with proper sensor calibration for different makes/models of engines/vehicles. I have no idea what they are, though.