In the early 1990s, South African Kadett GSi's were further upgraded based on their success in production car racing and initially 500 special units were built as road cars for homologation purposes. This was a minimum requirement for entry into the Stannic Group N races. They went against BMW's 325iS (A 2.7 litre homologation special from BMW). They featured more aggressive 276-degree camshafts made by Schrick with 2 different settings for timing overlap (110° and 107°), revised intake and exhaust modifications (4-in-1 branch manifold and freeflow exhaust), Irmscher spring kit, modified engine management system by Promotec, a limited slip differential developed by Andre Verwey and special Aluett 7Jx15-inch ET35 alloy wheels, they were nicknamed the "Superboss"[29] and held the world record for the most torque per litre (114 Nm per litre) for a naturally aspirated car until 2009 being beaten by the Ferrari 458 (117 Nm per litre). After the first 500 units were produced, many more were built to satisfy public demand.
In 2007, Opel introduced sport version of Corsa tuned by Opel Performance Center (OPC) – Corsa OPC. Corsa have 1.6 litre I4 turbo engine with 141 kW (192 PS; 189 hp) at 5.850 rpm and 230 N⋅m (170 lb⋅ft) of torque at 1,980 to 5,850 rpm, with overboost function which boost up torque figure to 266 N⋅m (196 lb⋅ft). 0 to 100 km/h (62 mph) time is 7.2 s and top speed is 225 km/h (140 mph). Differences with standard Corsa in interior are sporty Recaro seats, OPC steering wheel and gear knob, instrument dials with OPC background.
In 1993, a 125 kW/168 hp 2.5 litre V6 (C25XE or SE4) was introduced. Available with both manual and automatic transmissions, the V6 was not as fast as the Turbo, but was rather more civilised, and proved to be more reliable than the complex four wheel drive model. 1995 saw the introduction of the X20XEV Ecotec engine, a new version of the classic C20XE 16 valve or "red top" engine.
The range has a high level standard specification compared to similar vehicles from other manufacturers, including a lane departure warning system, cruise control, speed limiter, trip computer (instant MPG, average MPG, average speed, stop watch and trip computer), tyre pressure monitoring system, electronic stability program and traction control, front fog lamps and cornering lamps.
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).[8]
The Rally’s 1100 cc SR engine was hardly a drag-strip terror: the little 1100cc buzz-bomb got higher compression and a second carburetor, as well as possibly some other changes. The result was 67 gross/60 DIN-net hp. And what little torque there was, now moved even higher into the rpm range. I can hear their raspy and nervous exhaust in my ears still, as common as they were now in the Towson area. Undoubtedly, they improved on the regular Kadett’s 21 second 0-60 dash by maybe a couple of seconds. But they looked good doing it, as well as sounding good.
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Power will come exclusively from a three-cylinder 1.0-liter naturally aspirated gasoline engine developing 75 HP (55 kW) delivered to the front wheels through a five-speed manual gearbox. Opel and Vauxhall say the chassis has been tweaked to provide "exceptional safety and comfort" and both cars come with traction control, hill start assist and electronic stability control.
^ General Motors Austria Gesellschaft m.b.H. (GMA, founded 1963 as sales organisation; from 1979: Administration, Non-productive Departments an Sales) and General Motors Austria Werke Gesellschaft m.b.H. (GMAW founded 1979; Production). In November 1987 GMAW (Austrian Handelsregister, HRB 24.436) were merged into GMA (HRB 20.133b, actual Firmenbuch FN 110500a).
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