The E89 Z4 stands out as the only model to feature three distinct tunings of BMW’s N20 turbocharged engine. This powertrain versatility allowed BMW to cater to diverse driving preferences, from efficiency-focused commuting to spirited roadster performance, within a single model range.
- sDrive18i: Tuned for economy, this variant delivered 125kW (170hp) and 250Nm, pairing with an 8-speed automatic transmission (8AT) for smooth, efficient driving. It targeted buyers seeking a premium roadster experience without prioritizing raw power.
- sDrive20i: Positioned in the middle, the 20i tuning offered 135kW (184hp) and 270Nm, available with either the 8AT or a 7-speed dual-clutch transmission (DCT). This balance of performance and refinement made it a popular choice for daily drivers.
- sDrive28i: Replacing the outgoing 3.0L naturally aspirated six-cylinder, the 28i’s 180kW (245hp) and 350Nm made it the range-topper. Paired with either the DCT or 8AT, it delivered 0–100 km/h in ~5.7 seconds, blending straight-line speed with the Z4’s agile handling.
The N20 engine’s adaptability shone through its three tunes, each optimized for specific driving styles. The 28i, in particular, proved a worthy successor to the six-cylinder model, offering comparable performance with better fuel efficiency. The availability of both DCT and 8AT transmissions further tailored the driving experience—DCT for sporty, rapid shifts and 8AT for refined cruising—solidifying the E89 Z4 as a versatile premium roadster with a powertrain to match every driver’s needs.
