01 · Überblick
Forced induction instead of displacement
Instead of a V12, in 1980 BMW opted for a turbocharger at the top of the E23: the 745i extracted 252 PS from the 3.2-litre M102 — the name alluded to the calculated displacement equivalent (3.2 litres × turbo factor 1.4 ≈ 4.5). From 1983, the 3.4-litre M106 took over with the same output but more torque at lower engine speeds.
The turbo 7 Series remained a niche model for connoisseurs — with a typical turbo lag, but confident thrust. Today it is a sought-after rarity of the early turbocharging era.
02 · Historie
Einordnung
- 1980 Market launch with the M102 turbo — BMW's answer to the displacement question.
- 1983 The 3.4-litre M106 smooths out the power delivery.
- 1986 End without a direct successor — the E32 relies on the V12.
03 · Karosserievarianten
Karosserievarianten
Limousine
Understated exterior — only the badge and details give away the turbo.
04 · Motoren
M102 / M106 geprüft
Turbo versions of the large six-cylinder with K27 turbocharger. Maintenance: turbocharger condition, thermal management, vacuum system.
Technische Daten anzeigen
| Hubraum | 3.210 / 3.430 cm³ |
| Leistung | 252 PS (185 kW) at 5,200 and 4,700/min respectively |
| Bauart | R6-Turbo |
Wikipedia EN, BMW 7 Series (E23)
05 · Kaufberatung
Buying Advice in Brief
Check turbo history and consequences of heat build-up (manifold cracks). Rust as with the 735i. Good cars are rare and change hands before they are ever advertised.
06 · Die Konkurrenz
Die Konkurrenz
Mercedes 500 SEL (W126)
Naturally aspirated V8 versus turbo six — two paths to the same goal.
07 · Quellen