Powertrain families
ALPINA B4 twin-turbo inline-six · ALPINA D4 S mild-hybrid diesel inline-six
B4 / D4 (G26) — Gran Coupe
2022–present
Editorially reviewedReviewed 2026-08-10; market and model-year scope is stated in the record sources.
- Internal code
- ALPINA B4/D4 G26 Gran Coupé
- Production
- 2022–present
- Body style
- 4-door fastback
- Platform
- longitudinal layout · rear- or all-wheel drive
Body variants
B4 / D4 → G26 → Gran Coupe
B4 / D4 G26: history, design and engineering
How this generation came about, what made it different and how the selected gran coupe fits into the family.
G26 redefined the B4/D4 family around the five-door Gran Coupé rather than a two-door coupé and cabriolet. B4 used petrol six-cylinder power and D4 S a diesel mild-hybrid system, both with all-wheel drive and ALPINA-specific cooling, transmission, chassis and aero tuning.
Lifecycle development produced the B4 GT with higher output and revised dynamic hardware. B4, D4 S and GT require separate fuel, engine, performance and production rows even though the single G26 body is shared.
The model belongs to the final independent ALPINA programme through 2025. It should not be confused with BMW i4 electric G26 derivatives or assumed to continue under the post-2026 BMW ALPINA brand without primary evidence.
2022–presentgeneration lifecycle
1body branches
2engine/drive families
3range designations
G26factory code
longitudinal layout · rear- or all-wheel drivearchitecture
Gran Coupe: dimensions and packaging
Dimensions can change with body, market and model year, so this page keeps them tied to the exact factory branch.
Length4,792 mm
Width1,850 mm
Height1,440 mm
Wheelbase2,856 mm
Luggage470–1,290 L
Fuel tank59 L
Seats5
Doors4-door fastback
| Body | Code | Production | Doors / seats | Length | Luggage |
|---|---|---|---|---|---|
| Gran Coupe | ALPINA B4/D4 G26 Gran Coupé | 2022–present | 4-door fastback / 5 | 4,792 mm | 470–1,290 L |
Engines and powertrains
The generation could span very different engines and drivetrains. The table keeps output, gearbox, market and production period together.
Factory modification matrix
Documented gran coupe applications; output and availability remain market- and model-year-specific.
| Model | Years | Engine | Output | Transmission | Drive | Market | Source |
|---|---|---|---|---|---|---|---|
| B4 Gran Coupé | 2022–2025 | ALPINA S58 3.0 L twin-turbo inline-six | 495 PS | 8AT Switch-Tronic | AWD | Global range | BMW ALPINA B4 Gran Coupé |
| B4 GT Gran Coupé | 2025 | ALPINA S58 3.0 L twin-turbo inline-six | 529 PS | 8AT Switch-Tronic | AWD | Global range | BMW ALPINA B4 Gran Coupé |
| D4 S Gran Coupé | 2022–2025 | ALPINA B57 3.0 L diesel + 48 V mild hybrid | 355 PS system | 8AT Switch-Tronic | AWD | Europe | BMW ALPINA B4 Gran Coupé |
Factory designations
B4 Gran Coupé · B4 GT Gran Coupé · D4 S Gran Coupé
High-performance powertrain
Engine, cooling, exhaust, software and transmission form a distinct M or ALPINA specification rather than an option package on the base model.
Diesel derivatives
Where diesels were offered, output, injection generation and emissions hardware are recorded market by market.
Electrification
Mild- and plug-in hybrids are separate derivatives; combustion-engine output must not be substituted for total system output.
How power reaches the road
Gearboxes, driven wheels and final-drive hardware changed with engine, market and production date.
Transmissions
Gearbox type and unit code follow engine, market and production date. Gear count alone does not identify the transmission.
Driven wheels
Catalog architecture: longitudinal layout · rear- or all-wheel drive. All-wheel-drive availability and hardware remain derivative-specific.
Final drive
Ratio, differential type and electronic control belong to the exact derivative and can differ on performance models.
What changed underneath
Suspension, brakes, safety systems and electronics evolved across the range, even when cars shared the same basic architecture.
Body-branch dimensions
- ALPINA B4/D4 G26 Gran Coupé: 4,792 mm × 1,850 mm × 1,440 mm
Body & suspension
- Mounting points and geometry follow the body branch
- Springs and dampers follow axle load and chassis package
- Wheels and permitted loads follow the factory label
Brakes & steering
- Brake size follows engine and equipment
- Assistance type and steering ratio can change
- ABS/DSC generation follows model year
Passive safety
- Airbag count varies by market and year
- SRS parts are VIN-specific
- Structural repairs require factory procedures
Electronics
- Vehicle-bus generations changed during production
- Control-unit software levels must remain compatible
- Retrofits are recorded separately from factory equipment
How the generation evolved
The important launches, additions and updates did not always happen at the same time for every body or market.
B4 Gran Coupé
The petrol five-door model launched the new body concept.
D4 S Gran Coupé
A diesel mild-hybrid counterpart formed a separate powertrain branch.
Lifecycle revisions
Equipment and underlying 4 Series changes entered production.
B4 GT and independent-era end
The GT closed the line as the cooperation agreement expired.
The versions that stood apart
Performance models, option packages and regional editions may look related, but their engineering and production identity can be very different.
Gran Coupe
ALPINA B4/D4 G26 Gran CoupéB4 / D4 ALPINA B4/D4 G26 Gran Coupé is a distinct G26 body branch. A four-door fastback combining a coupe-like roofline with easier rear access and a large tailgate or sedan-style luggage opening. Engines/drive: ALPINA B4 twin-turbo inline-six, ALPINA D4 S mild-hybrid diesel inline-six.
Inside the car
Cabin technology and standard equipment changed by country and year; a build sheet remains the best guide to one individual car.
Cabin & comfort
- Trim and seats follow option codes
- Climate systems vary by market
- Audio and navigation changed by model year
Lighting & assistance
- Lamp technology and modules follow production date
- Driver assistance cannot be inferred from buttons alone
- Regional rules affect lighting and warnings
What to check today
A practical starting point for inspecting and maintaining a car from this generation — not a diagnosis of an individual example.
Identify first
- Match VIN on body and documents
- Obtain the factory option list
- Confirm market and production date
Inspect the structure
- Check repairs and corrosion
- Assess suspension, brakes and tyres
- Compare fitted parts with factory specification
Mechanical history
- Read faults with compatible diagnostics
- Verify engine and transmission maintenance
- Separate invoices from unsupported verbal history
| Item | Interval / trigger | Catalog note |
|---|---|---|
| Engine oil & filter | CBS/factory schedule; time and mileage for historic cars | Oil approval follows the exact engine and market. |
| Brake fluid | Time-based factory schedule | ABS/DSC-compatible bleeding procedure is required after hydraulic work. |
| Coolant | Factory schedule and condition | Fluid specification and bleeding method are generation-specific. |
| Transmission & final drives | Unit type and operating conditions | Use the exact approved fluid; no one interval fits every derivative. |
How to identify the exact car
The badge and registration year tell only part of the story; production date, body code, engine and factory options complete it.
- Factory body codes
- ALPINA B4/D4 G26 Gran Coupé — Gran Coupe
- Range designations
- B4 Gran Coupé, B4 GT Gran Coupé, D4 S Gran Coupé
- Powertrain families
- ALPINA B4 twin-turbo inline-six, ALPINA D4 S mild-hybrid diesel inline-six
- VIN
- Identifies model, plant and production branch and keys the parts catalog and factory equipment record.
- Production date
- More useful than first-registration year when choosing parts and locating technical revisions.
- Type code
- Refines engine, body, market and transmission combination.
- Option codes
- Confirm factory equipment; later retrofits are recorded separately.
- Unit number
- Supports engine or gearbox originality checks and component applicability.
Where the information comes from
The story is mapped through English Wikipedia and its bibliography, then important dates and technical claims are checked against BMW material.
- 01AlpinaWikipedia contributors
Secondary company, manufacturer-status and model-line context.
- 02BMW ALPINA B4 Gran CoupéALPINA Automobiles model archive
Factory model archive with base BMW, production dates, engine type and performance by derivative.
- 03Expanding the portfolio: BMW Group acquires the ALPINA brandBMW Group PressClub
Primary record of the independent ALPINA programme ending after 2025 and the trademark transition to BMW Group.
Notes and limitations
- Research revision dated 2026-08-10: English Wikipedia was used as a subject and bibliography map; key claims were checked against the listed primary BMW Group material.
- G26 B4/D4 is Gran Coupé only; do not create G22/G23 bodies without a matching ALPINA production model.
- B4 GT is a distinct late mechanical evolution, not only an appearance package.
- Tree years describe the worldwide generation lifecycle; individual market dates may be narrower.
- Exact dimensions, power, weight and emissions belong at body, engine, market and model-year level.
- Known-issue guidance is editorial context and never replaces inspection of the individual vehicle.
3 primary references · market differences documentedPhotography: MrWalkr, CC BY-SA 4.0 · Wikimedia Commons. Rights checked 2026-08-06; wikimedia commons 1,800 px derivative downloaded; local 640 px and 1,280 px avif versions created without cropping.Updated 6 August 2026