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Just be aware that some of the parameters are lookups, as pheno mentions.
Engine torque obviously one of those. Then you need to be careful with any speed or acceleration parameters that come from the drive train. Even with the traction nannies on, the wheels can and do move faster than the pavement.
I spent considerable time trying to do this via Testo. Have no intention of curbing anyone's enthusiasm and would love it if someone could get a reliable method working. I concluded the sampling rate and accuracy of the accelerometers in my phone (not all phone are created equal) surpassed anything I could do thru the OBDII port. IMO, the method used by TDIwyse is a good one to model.
If I really wanted to get serious about it, I would intercept the signals from the driver's side front wheel speed sensor with my high speed data logger. For straight line performance, that is even better than an accelerometer.
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