Unfortunately, Opel’s first victory in the DTM turned out to be as much of a fluke as the podium at Hockenheim. The Calibra’s fell behind once more, and resorted to occupying the lower end of the top 10. The airfield circuit at Diepholz, a third visit to the Nurburgring and the high-speed section of autobahn known as the AVUS-ring were all without meaningful results.
The GSi's engine mapping had been carried out by Opel tuning specialists Irmscher. A model with the 82 PS (60 kW) 1.4 L multi point fuel injected engine, which was otherwise mechanically identical to the GSi, also became available as the Nova SRi in the United Kingdom. In January 1988, a turbocharged version of the Isuzu diesel engine was introduced, with power increased to 67 PS (49 kW).