Thats good. I wonder if they do it on a flow bench? I have been reading up on garrats non repair policy. They claim that their vnt turbos are calibrated so finely that just taking a turbo apart knocks it out. And they do not remanufacture turbos or even sell parts for them.. hmmm I wonder what their agenda is! They also do not provide specifications for setting up a turbo, as they do in their factory, so other companies cannot calibrate them to oem specs... hmmmm wonder why that is!
I have a theory... to fool consumers into thinking that they have to buy a brand new unit..
they say your car could over boost and cause the turbo to spin too fast.... well I can blow that theory right out of the water right now... your engines ecu controls the amount of boost from readings for your map and maf sensors.. if it's too high the ecu trims the fuel until it comes down to the requested value..
they also say it could underboost causing pressure and heat build up in the turbine causing premature failure... now the only way that can happen is if the vanes dont open enough and to be frank it would have to be well out of alignment for that to happen.
The electronic actuator, so they say, has its eprom flashed at the factory to the calibration set by the flow bench. Fair enough... but it always reverts to its parked position when you turn the car off... that is a constant. If you align it as it was before your only talking a fraction of a mm if that!
Its utterly ridiculous to believe that 0.02 of a mm can cause over or under boost as they describe. And I bet if they were put on a flow bench pre and post rebuild that the difference would be minimal. Not to mention the ecu altering fuelling and learning as you drive.
So all in all I think it's all bull and just a way of making people think that they are infinitely more complicated than they actually are.