In other words, it combines the luxury of the S4 with the higher performance of the Clubsport.' Porsche's senior marketing manager Hans Halbach explains: 'The 928GT is a blend of 928S4 and 928 Clubsport. But it has a - however tacky -GT badge on its foam-filled, impact-absorbing rump, which indicates that this brand-new 928 derivative is something special. The Porsche 928GT has only one ignition key nor does it have most of the US car's eccentricities, such as rainbow-hued instruments, selective ride control or six-speed transmission using computer-aided gear selection. 'There are owners who would prefer their spouses or sons not to be in command of the ZR-1's full performance potential.' Gimmick or necessity? 'Call it a precautionary measure,' says chief engineer Dave McLellan.
But as soon as you flick the stubby power key to the left, the unit runs on all 16 injectors and 32 valves. In this better-safe-than-sorry mode, the engine runs only three valves and one injector per cylinder. Without it the ZR-1 is barely as quick as an off-the-shelf 240bhp L89 Corvette normale. To free the remaining 20 percent, you turn the second so-called power or valet key which lives in a slot in front of the gearlever. The first starts the engine, which then has only about 80 percent of maximum power at its disposal. The Corvette ZR-1 is the only car in the world that has two ignition keys.
