In 1995, an exclusive limited edition race-bred model developed in part with Porsche named the T-5R was released.
The vehicle was based upon the 850 Turbo with the B5234T5 engine with a special ECU known as the Bosch #628 ECU, that added 3 psi (0.2 bar) to turbocharger boost pressure, giving the engine an additional 18 horsepower (13 kW). The T-5R was capable of accelerating to 60 mph (97 km/h) in 5.7 seconds and completing a quarter-mile in 14.8 seconds. Top speed was electronically limited to 155 mph (249 km/h). Vehicles have been tested to 159 mph (256 km/h) with the governor.[citation needed] Ungoverned, the vehicle could hit 168 mph (270 km/h).[citation needed] In competition, under TWR Racing, T-5R variants could hit 183 mph (295 km/h).[citation needed]
