Due to the modular system of the BMW engines, it was easy for Alpina, also appeared in the new 6 Series coupe is equally as alltaugstaugliche athletic performance enhancements to make.

For the beginning of the offered E24 BMW 630 CSi CS and 633 were already known, B2 and B8 referred engines from the series 5 Series E12, Sedan Coupe E9 and E3 to be, the point B is called the big six-cylinder M30, the next number each stage of development.

From 1978 Alpina trades as an independent car manufacturer, to the first right at the beginning Alpinas counted 630 Turbo BMW Alpina B7 Turbo Coupé called that deals with 300 hp and 260 km / h not only in the sports car-like performance data, but also with 79,990 DM prices upwards settle. For comparison: a 240 km / h faster Porsche 928 costing DM 58,800, - an 'only' 182 km / h faster Golf GTI I DM 13,580, - (1976).

But technically, the B7 Turbo Drive the center of attention: the maximum boost pressure of the turbocharger could Dampfrad by from the driver's seat of a maximum of 1.85 bar 1.55 bar (equivalent to 250 hp) will be lowered and for development of an improved performance at low speeds, ie before the onset of the turbocharger (turbo-lag), provided a special tuned resonance charging, then this so-called combined charge was by the Hungarian engineer Dr. Cser and developed by the Head of the Alpina engine development Fritz Indra, for the first time in a production car reality. The injection took over an electronically controlled, Pierburg DL luftmengenmessende facilities, and for the correct ignition timing caused an equally electronic, contactless Dr. Hartig-controlled ignition system.

Once on the new BMW Bosch Motronic redenominated had B7turbos also benefited from this engine, which the control of boost pressure, ignition and injection, integrated and coordinated. Alpina After the first vehicle manufacturer, the new metal catalysts Emitec, due to lower exhaust back pressure as compared to catalysts with ceramic makers in the series production, has also assumed the Motronic lambda scheme.

Somewhat in the shadow of attention, they were not quite as strong models of B9 and B10, but thanks to its balance because of the strong naturally aspirated in the best tradition of the classic Gran Turismo stood.

The only built from 1982 built B9 on the 635 CSi, which improve performance by classical Motortuning achieved: the hemispherical combustion chambers designed to provide a better combustion of the processed Ansaugkanäle and the camshaft with only slightly longer opening hours (268 ° instead of 264 ° KW KW) and a modified form of cam eingeströmten mixture increased, the Motronic was re-tuned fit. Despite significantly improved driving performance, the B9 Coupé consumes less fuel than the underlying series BMW. However, the B9 with a price of DM 72,950, - (1982) in the same price class as a Mercedes-Benz 500 SEC, this is certainly one of the reasons that the B9 and its 1985 successor B10 appeared only a total of 119 vehicles will be built.