Audi Turbo Quattro Coupe Introductory Service Training Information This is one of two documents ca. 1982, which were used to train Audi mechanics on the internal workings of the then-new ur-quattro. This document is the “How Things Work” introduction, with pictures of the important mechanical components of the turbo engine and quattro drivetrain. “IST Maintenance and Adjustments” provides the details of tuning the Bosch CIS-Lambda system, as well as the quattro components. The Maintenance and Adjustments document provides the turbo engine information which is completely missing from the Bentley’s shop manual. This PDF file is scanned and stored at 300 dpi, so that it can be printed at high quality. This page and the blank page to its left are there so that facing pages of the original manual are correctly displayed on-screen.