Quote Originally Posted by RandomGuy
in a two speed idle test basically they put the front end on the lift and roll the rear on the dyno. Then they test it.
Negative. That would damage the center differential anyways, and is not how a TSI test works.

A two speed idle test hooks up the car to test along with an RPM sensor and then idles the car at an increased RPM followed by a test at the regular idle speed and compares the emissions from the two.