I think the hole location in the flange could allow another 1-2 degrees of error. There is also a question about the accuracy of the location of the front flange location hole that the crank lock uses. However well the tools are made, we find that the hole in the flange that is used to pin the crank sprocket into position has a movement of about 1-2 degrees. We have been providing their timing tools for several years. The only way to set the engine for TDC is by using a crank lock, such as that sold by Metalnerd. The torsion value was set at -5.7 and the owner says her manual transmission car averages 45mpg and on a trip will get over 52mpg! Most recently, we checked the value on a car that was in for an oil change. Now we find that the value can be positive or negative a much greater degree. The customer had us return the value to it's original setting of -.5 and the mileage came right back. However, early on, we had a Passat Wagon that lost 4 mpg when we set the torsion value to 0.0. We tended to figure that 0.0 was a good figure and originally let it go at that. The torsion value is located in VCDS/Engine Module/ block 4/ torsion value. Since first working on the PD motors, we found the setting of the torsion value a bit of a mystery.
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