The BMW Z4 (E89) 35i sDrive, produced from 2010 to 2013, represented a significant step forward for BMW’s two-seater roadster. Positioned as the performance variant within the E89 Z4 lineup, it offered a substantial power increase over the base 28i model, appealing to drivers seeking a more engaging and dynamic driving experience. The E89 generation marked a departure from the previous Z4 (E85) with its retractable hardtop, offering improved security and all-weather usability. This model competed directly with rivals like the Porsche Boxster and Mercedes-Benz SLK, aiming to deliver a blend of sporting performance and open-air luxury.
Technical Specifications
| Brand | BMW |
| Model | Z4 |
| Generation | Z4 (E89) |
| Type (Engine) | 35i (306 Hp) sDrive |
| Start of production | 2010 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 13.5 l/100 km (17.4 US mpg, 20.9 UK mpg, 7.4 km/l) |
| Fuel consumption (extra urban) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| Fuel consumption (combined) | 9.4 l/100 km (25 US mpg, 30.1 UK mpg, 10.6 km/l) |
| CO2 emissions | 219 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 5.2 kg/Hp, 193.7 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 253.2 Nm/tonne |
| Power | 306 Hp @ 5800 rpm |
| Power per litre | 102.7 Hp/l |
| Torque | 400 Nm @ 1300-5000 rpm (295.02 lb.-ft. @ 1300-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N54B30A |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 8.2 l (8.66 US qt | 7.21 UK qt) |
| Kerb Weight | 1580 kg (3483.3 lbs.) |
| Max. weight | 1835 kg (4045.48 lbs.) |
| Max load | 255 kg (562.18 lbs.) |
| Fuel tank capacity | 55 l (14.53 US gal | 12.1 UK gal) |
| Length | 4239 mm (166.89 in.) |
| Width | 1790 mm (70.47 in.) |
| Height | 1291 mm (50.83 in.) |
| Wheelbase | 2496 mm (98.27 in.) |
| Front track | 1511 mm (59.49 in.) |
| Rear (Back) track | 1559 mm (61.38 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 225/45 R17 W |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
At the heart of the Z4 35i sDrive lies the N54B30A, a 3.0-liter inline-six engine. This engine is a marvel of engineering, employing twin-turbocharging and direct fuel injection to deliver a potent 306 horsepower and 400 Nm (295 lb-ft) of torque. The twin-turbo setup utilizes a small turbo for quick spool-up and minimal turbo lag, complemented by a larger turbo for high-end power. Direct injection ensures precise fuel delivery, maximizing combustion efficiency and power output. The N54 engine is known for its robust construction and responsiveness, though it can be susceptible to certain issues like carbon buildup and fuel injector failures with age and improper maintenance. The standard transmission was a six-speed manual, but a six-speed automatic with paddle shifters was also available, offering convenience without sacrificing too much driver engagement.
Driving Characteristics
The Z4 35i sDrive delivers a thrilling driving experience. Acceleration from 0 to 60 mph takes approximately 4.9 seconds, making it genuinely quick for a roadster. The engine’s broad torque curve provides strong pull throughout the rev range, making overtaking effortless. The manual transmission offers precise shifts and a satisfying mechanical feel, while the automatic, when equipped, provides smooth and relatively quick gear changes. The rear-wheel-drive configuration contributes to a balanced chassis and predictable handling. Compared to the base 28i model, the 35i offers a significantly more visceral and engaging driving experience, with noticeably stronger acceleration and a more responsive throttle.
Equipment & Trim Levels
The Z4 35i sDrive came well-equipped as standard. Interior features included leather upholstery, power-adjustable seats, automatic climate control, and a premium sound system. Optional extras included navigation, heated seats, a sport steering wheel, and various cosmetic enhancements. The interior design was driver-focused, with a clean and functional layout. Trim levels were relatively simple, with most options being added individually rather than packaged into distinct tiers. The focus was on providing a customizable experience tailored to the buyer’s preferences.
Chassis & Braking
The Z4 35i sDrive features a MacPherson strut front suspension and a multi-link rear suspension, providing a good balance of ride comfort and handling precision. The suspension was tuned to be slightly firmer than the 28i model to complement the increased power. Brakes consisted of ventilated discs all around, providing ample stopping power. ABS (Anti-lock Braking System) was standard. The car’s relatively low weight and balanced chassis contribute to its agile handling characteristics. The steering is precise and well-weighted, providing good feedback to the driver.
Market Reception & Comparison
The Z4 35i sDrive was generally well-received by automotive critics. It was praised for its powerful engine, engaging handling, and comfortable interior. However, some critics noted that the ride could be a bit firm on rough roads. Compared to the 28i model, the 35i offered a significant performance upgrade, but at a higher price point. Fuel economy was reasonable for a performance roadster, averaging around 25 mpg combined. Reliability was generally good, although the N54 engine required diligent maintenance to prevent potential issues.
Legacy
The BMW Z4 (E89) 35i sDrive remains a desirable roadster in the used car market. Its combination of performance, style, and practicality continues to appeal to enthusiasts. The N54 engine, while requiring careful maintenance, is known for its tuning potential. Well-maintained examples command a premium price. The E89 Z4, and particularly the 35i variant, represents a high point in BMW’s roadster lineage, offering a compelling alternative to its rivals and a rewarding driving experience.
