2027 BMW 3 Series and i3 First Drive Reveals 'Big Gamble' with Distinct Models

BMW is embarking on a significant strategic shift with its 2027 3 Series and i3 models, moving away from the traditional approach where electric variants are merely electrified versions of their gasoline counterparts. This new strategy introduces two completely distinct cars that primarily share a design theme, representing a considerable gamble for the brand’s popular 3 Series line.

Unlike previous BMW electric vehicles such as the i4, i5, and i7, the 2027 i3 and 3 Series gas models will feature different chassis, body panels, glass, and even distinct, though related, electrical architectures. This paradigm shift aims to optimize each car for its respective powertrain, moving beyond the 'jack-of-all-trades' concept.

For the traditional internal combustion engine (ICE) 3 Series, which will be sold in the U.S. as the 330 and M350, BMW continues to utilize a modified CLAR platform. The 330 is powered by an extensively revised 2.0-liter turbo-four engine, now producing 255 horsepower and 295 lb-ft of torque, with the aid of a 48-volt mild hybridization system introduced in 2025. The M Performance M350 variant receives a mildly hybridized 3.0-liter I-6 turbo engine, generating 437 hp and 428 lb-ft. Both ICE models are paired with an eight-speed automatic transmission, with xDrive all-wheel drive optional on the 330 and standard on the M350.

The all-electric i3, specifically the mid-price 50 xDrive two-motor format, features an asynchronous inductive motor in the front and a self-energized synchronous motor in the rear, delivering a combined 463 hp and 476 lb-ft. A key innovation in the i3 is its four-computer zonal electronic architecture, which includes a central unit charmingly named 'Heart of Joy' dedicated to regulating all driving dynamics. This advanced system boasts ten times the computing power of previous systems, drastically reducing latency from approximately 20 milliseconds to a mere 1 millisecond, a difference perceptible to the driver.

While the exterior designs of the ICE 3 Series and i3 share elements like the grille and front lighting, significant differences exist beneath the surface. Internally, more components are commonized, including the pillar-to-pillar Panoramic iDrive screen, the angled 'free-cut' center screen, and steering wheels. Features from the BMW Symbiotic Drive set of automated driving and parking are also shared. However, the i3's higher floor necessitates unique seats, and it lacks a center transmission tunnel.

In terms of powertrain and chassis, commonality is minimal, limited to components that make practical sense. Interestingly, programming for systems such as the all-wheel-drive clutch in the transfer case and the M350's electronic differential is heavily informed by learnings from the i3 and iX3. The gas-powered 3 Series also shares the i3/iX3’s central six-dimensional chassis sensor but does not incorporate the 10x faster processor. This is because the rapid, precise torque adjustments possible with electric motors (e.g., millisecond orders to the ABS circuit for micropulsing a brake) cannot be replicated by a fuel-exploding cylinder in an ICE, which operates on a different dynamic principle.

Some exterior design harmonizations between these disparate cars unintentionally benefited the gas model. The larger battery requirement for the i3 led to increased body and track width, which provided an opportunity for BMW to broaden the 3 Series' stance and completely rethink its suspension system.