Taking a good long year to plan their assault on Alfa Romeo, the company enlisted the best names in the business in the hope of quickly conquering what was steadily becoming the world’s most prestigious touring car series. Unfortunately Joest Racing and Cosworth could only do so much. Even with the immense talent of three very determined drivers, the first iterations of the Calibra just didn’t cut it. A lucky win and two random podiums was all it could muster.
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).