Vibrations from engine at low rpm

[TVK]

You say it's between 1700-2000 rpm.
I bet it's the: dual mass flywheel.

 

[Pinky]

These are the typical vibrations we all know from an engine running at too low RPM. A deep booming noise comes from the engine, accompanied by vibrations that can be felt throughout the entire car. The dashboard starts to rattle, and the vibrations can be felt throughout the entire car.

That's why, as I mentioned above, I would understand this behavior if the engine were simply running at too low RPM. In that case, I would expect the vibrations to start at low RPM, for example 1200 rpm and gradually disappear as the rpms increase, with the engine running smoother and smoother.

However, that's not what's happening here. At around 1200 RPM everything is perfectly smooth. The booming noise and vibrations start at about 1700 RPM and disappear at around 2000 RPM.

Ok.

I ask because I am an aerospace environmental test engineer for work.

Seems drivetrain not engine to me. Like clutch judder.