How does data logging tell you what the issue is? Does it log what is making the smoke, high EGT's, or lack of power? No it doesn't, that is up to the tuner to determine what caused the issue.
With a RP gauge you can sure tell what is being achieved, match your load/rpm/RP maps and see if its giving what you commanded. Is it faster with data logging, you bet it is, but it can be done the old fashioned way.
I don't know who said it wasn't a great tool, but it's just that.. a tool. There are other ways to tune, and they can be just as effective.
Data logging has no way of telling you if the maps are optimized for the motor, it just tells you what is going on. To me effective means making the most of your fuel, and that's in the maps and what happens in the cylinder, unless EFI has a sensor added to the cylinder you don't know what the ignition delay is, what the peak cylinder pressure is, or when it occurs... those type of numbers are what tells you if it's effective, not what the commanded pulse width, timing, or rail pressure are. Those numbers tell you if your maps are matched to your base tune and motor modifications.
I would love for UDC to offer data logging, it would save a lot of time in fine tuning things. I would also kill for a few more tables to adjust, but as of now my truck has never run better thanks to UDC.
