Ok - well I finally did some of this IMP/EMP measurement work and also synchronized it with VagCom data. This was much more difficult than just installing the two gauges, but far easier to read and analyze.
The short summary is that the EMP is ~10 PSI higher than IMP's at ~4800 RPM
This is just a print screen shot of a 3rd gear pull from idle, rolling on to 100% throttle by ~1500 RPM, continuing to ~4800 RPM. The Vag data is from groups 1, 3 & 11 (not all plotted, but all available). The Vag data is the blocky, low resolution curves, the analog data is sampled at 0.002 sec intervals (I'll turn this down in the future to 0.005 or 0.010 sec intervals).
EMP=Exhaust Manifold Pressure measured at the EGR port in PSI
IMP=Intake Manifold Pressure measured at the left end of the horizontal part of the intake manifold
TIP=Compressor Inlet Pressure measured at the Vacuum system vent in the Airbox.
IMP-EMP=Difference between IMP and EMP
MAF Actual=VagLog data of MAF Sensor Reading
RPM=VagLog data of Engine RPM
If there's someting specific that you'd like to see, speak up as I've got this setup and I've got a warm place to work on it
. I will make some .pdf's of this when I get back to a place where I can do it. I can add/delete channels and perform calculations as well so let me know if there's something you want to see.
Current mods are: TDI Parts 17/22 turbo, RC4ish tune, 3 bar MAP, 3" turbo inlet tube, 3" downpipe, 4" exhaust and Aeroturbine muffler, PP502's, PD Lift pump, EGR Race Pipe and cooler delete. All other parts are stock (unless I forgot something, 10mm pump, OEM SMIC and piping, airbox,filter, MAF, etc). Lower intercooler grill was removed (tow eye inserted to get me un-stuck).