2017-2018 BMW i3s (l01) 32.2 kWh (184 Hp) Range Extender

The BMW i3s (L01) with the 32.2 kWh battery and range extender, produced from November 2017 to November 2018, represents a significant iteration of BMW’s foray into electric vehicle technology. Positioned as a performance-oriented variant within the i3 lineup, the ‘s’ designation denoted a sportier driving experience compared to the standard i3. This model aimed to address range anxiety – a common concern for early EV adopters – by incorporating a small gasoline engine acting as a generator to extend the all-electric range. It primarily targeted urban drivers seeking a premium, eco-conscious vehicle with a degree of flexibility for longer journeys. The i3s, built on the carbon fiber reinforced plastic (CFRP) driven LifeModule architecture, was a key component of BMW’s ‘Project i’ – an initiative to develop innovative and sustainable mobility solutions.

Technical Specifications

Powertrain & Engine Architecture

The i3s’s powertrain is a sophisticated hybrid system. The core of the vehicle is a rear-mounted electric motor, producing 184 horsepower and 270 Nm (199 lb-ft) of torque. This motor, designated IB1P23M0, delivers instant torque, providing brisk acceleration. The range extender is a 647cc two-cylinder gasoline engine (W20K06U0) that doesn’t directly drive the wheels. Instead, it powers a generator, replenishing the battery charge while on the move. This engine produces 38 horsepower and 56 Nm (41 lb-ft) of torque. The engine utilizes direct fuel injection and a relatively high compression ratio of 10.6:1. The single-speed automatic transmission is integral to the electric motor, providing seamless power delivery. The battery pack, utilizing lithium-ion technology, has a gross capacity of 32.2 kWh, with a usable capacity of 27.2 kWh.

Driving Characteristics

The i3s, even with the range extender, prioritizes electric driving. In typical urban conditions, the gasoline engine rarely engages, offering a near-silent and emission-free experience. The instant torque of the electric motor provides lively acceleration, with 0-60 mph achieved in approximately 7.3 seconds. The single-speed transmission means there’s no gear shifting, contributing to a smooth and effortless driving experience. Compared to the standard i3, the ‘s’ model features a wider track and stiffer suspension, resulting in improved handling and cornering stability. While the range extender adds weight, the overall impact on driving dynamics is minimal. The regenerative braking system is highly effective, capturing kinetic energy during deceleration and feeding it back into the battery, further enhancing efficiency.

Equipment & Trim Levels

The i3s typically came well-equipped, reflecting its premium positioning. Standard features included automatic climate control, a 10.25-inch infotainment screen with navigation, and a suite of safety features like automatic emergency braking and lane departure warning. Interior upholstery was typically a combination of recycled materials and high-quality fabrics. Optional extras included leather upholstery, a sunroof, and a Harman Kardon sound system. The i3s also featured unique styling cues, such as wider fenders and a sportier suspension setup, differentiating it from the standard i3.

Chassis & Braking

The i3s’s chassis is a defining feature, utilizing a CFRP passenger cell mounted on an aluminum drive module. This construction results in a remarkably lightweight vehicle, contributing to its agility and efficiency. The front suspension employs a McPherson strut design, while the rear features a multi-link setup. Both ends benefit from stabilizer bars to reduce body roll. Braking is handled by ventilated disc brakes on all four wheels, providing ample stopping power. The electric power steering offers precise and responsive control.

Market Reception & Comparison

The i3s received generally positive reviews, praised for its innovative design, engaging driving dynamics, and eco-friendly credentials. Critics noted the limited range of the all-electric mode, but the range extender alleviated this concern for many drivers. Compared to the standard i3, the ‘s’ model was seen as a more compelling option for those seeking a sportier and more refined driving experience. Against competitors like the Nissan Leaf and Volkswagen e-Golf, the i3s stood out with its unique construction and premium interior. Fuel economy, when utilizing both electric and gasoline power, was excellent, and the i3s qualified for various government incentives.

Legacy

The BMW i3s, while discontinued in 2018, remains a significant vehicle in the history of electric mobility. Its CFRP construction and innovative powertrain demonstrated BMW’s commitment to sustainable transportation. The i3s has proven to be a relatively reliable vehicle, with the electric motor and battery pack exhibiting good longevity. The range extender engine, while small, is generally robust and requires minimal maintenance. On the used car market, the i3s holds its value reasonably well, appealing to environmentally conscious buyers seeking a unique and technologically advanced vehicle.