Concluding the Impakt arc will be the most highly regarded of them all, the 1993 260R.
The 260R came around at a time when changing touring car regulations put an end to the legendary Group A era. The 4 cylinder Impakt TS was no longer competitive in the German Touring Car Championship, so for 1993 the Class 2 spec Impakt C2 Supertouring was devised. The Class 2 regulations demanded a 2.5L V6 engine, which presented IMP who have always campaigned the inline layout with a unique problem. IMPs only previous V6 engine was a medium displacement diesel engine devised for vans in the 1980s. By coincindence however IMP had bought a small bankrupt American manufacturer that had specialised in the V6 layout back in 1981 -LaVache. A few years prior LaVache had introduced an all-new medium displacement V6 in the 1989 Skywarp. A high output quad-cam variant with 24V was also part of this family. As a result LaVache did most of the work on the new racing V6, loosely based on the Skywarp RT4 S engine.
The RT4 S V6 was a 3.6L unit that was capable of producing 282hp @ 6800rpm, impressive for any car of the era, but nowhere near the specifications it needed to be competitive. The block was debored and machined for less weight, a short throw crankshaft fitted, and the valvetrain was completely overhauled to allow engine speeds beyond 11000rpm. The competition engine was in the region of ~410hp, but fitted to the by then over ten year old Impakt chassis the car was a mid-field competitor at best, especially compared to the dominant, all-wheel-drive Alfa Romeo 155 2.5 V6 TI. THAT shortcoming would be solved by late 1994.
The truly amazing part of this story though is the fact IMP actually put the race car into series production. This meant the engine had to be tamed to be street legal and meet global emission standards. Very little had actually been changed apart from different camshafts, softer valve springs, a more restrictive exhaust with catalytic converter and mufflers and leaner fuel mixture. The road legal engine produced 263hp and 269Nm, paired to the original Getrag 5-speed Dogleg sports transmission and installed in a 1992 spec Impakt TS DTM body sans the roll-cage and a stripped production interior. Because of homologation reasons 5000 of these cars were made. Not at all surprisingly these cars were notoriously demanding to maintain, with mandatory engine rebuilds every 100.000km, which cost nearly as much as the cars themselves. More often than not the engines would fail long before that. This however only added to the mythos and appeal of the 260R, which is regarded as the crowing achievement of IMPs most iconic era.
The 260R was available in three colours.
1993-1995 Impakt 260R
Engine: IMP QB-25G [LaVache 6V93R] 60° DOHC 24V V6, Aluminium Block and Cylinder Head, Bore x Stroke 89x66,3mm, total displacement 2499cc, Compression ratio 11,5:1, 263hp @ 7300rpm & 269Nm @ 6400rpm, Engine redline 9100rpm, Wet weight 134kg
Chassis and body: 4-door Saloon, corrosion resistant steel monocoque and body panels, with kevlar bonnet, bootlid and front fenders.
Double wisbone suspension with coil springs front and rear, four-wheel vented disc brakes with ABS.
Curb weight 1180kg, Weight distribution 54/46 F/R
Performance: 0-100kph 5.2s, 0-160kph 11.6s, 1/4mile in 13.5s @ 173kph, Top Speed 254kph
100-0kph braking distance 29,33m.
Price (1993): DM 97,650
Units made: 5026
A successor with a heavily reengineered 2.6L engine was launched in 1996.