Powertrain families
M20B25 inline-six
Z1 (E30/Z) — Roadster
1988–1991
Editorially reviewedReviewed 2026-08-10; market and model-year scope is stated in the record sources.
- Internal code
- E30/Z
- Production
- 1988–1991
- Body style
- 2-door roadster
- Platform
- longitudinal layout · rear-wheel drive
Body variants
Z1 → E30/Z → Roadster
Z1 E30/Z: history, design and engineering
How this generation came about, what made it different and how the selected roadster fits into the family.
The Z1 was the first production project developed by BMW Technik and served as a rolling laboratory rather than a conventional derivative of the E30. It used a hot-dip-galvanised steel monocoque, removable thermoplastic exterior panels, a bonded composite floor and vertically retracting doors.
Its 2.5-litre M20 straight-six and five-speed manual were familiar BMW components, but the front-mid-engine installation, long wheelbase and newly designed Z-axle rear suspension gave the two-seat roadster its own chassis identity. E30/Z is an internal relationship label, not evidence that ordinary E30 body dimensions apply.
BMW Group Archive dates production from 1988 to 1991, while first customer deliveries and many registrations fall in 1989. The catalog separates production start from market year and records the sole regular powertrain rather than inventing model derivatives from colours or equipment combinations.
1988–1991generation lifecycle
1body branches
1engine/drive families
1range designations
E30/Zfactory code
longitudinal layout · rear-wheel drivearchitecture
Roadster: dimensions and packaging
Dimensions can change with body, market and model year, so this page keeps them tied to the exact factory branch.
Length3,921 mm
Width1,690 mm
Height1,277 mm
Wheelbase2,447 mm
Luggage260 L
Fuel tank58 L
Seats2
Doors2-door roadster
| Body | Code | Production | Doors / seats | Length | Luggage |
|---|---|---|---|---|---|
| Roadster | E30/Z | 1988–1991 | 2-door roadster / 2 | 3,921 mm | 260 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 roadster applications; output and availability remain market- and model-year-specific.
| Model | Years | Engine | Output | Transmission | Drive | Market | Source |
|---|---|---|---|---|---|---|---|
| Z1 | 1988–1991 | M20B25 2.5 L inline-six | 170 PS | 5MT | RWD | Global range | BMW Z1 (E30/Z) |
Factory designations
Z1
Petrol engines
Inline and V engines are grouped by engine family, displacement, induction system and emissions specification.
Diesel derivatives
Where diesels were offered, output, injection generation and emissions hardware are recorded market by market.
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-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
- E30/Z: 3,921 mm × 1,690 mm × 1,277 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.
BMW Technik founded
The specialist development unit began work on the experimental roadster program.
Public debut
The production-intent Z1 appeared at the Frankfurt motor show.
Production and deliveries
Series production began in 1988 and customer deliveries followed for the 1989 market period.
Limited series ends
Production closed after the single regular roadster configuration.
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.
Roadster
E30/ZZ1 E30/Z is a distinct E30/Z body branch. A purpose-designed two-seat open sports car with compact packaging and a driver-focused cockpit. Engines/drive: M20B25 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
- E30/Z — Roadster
- Range designations
- Z1
- Powertrain families
- M20B25 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.
- 01BMW Z1Wikipedia contributors
Secondary development, construction and production overview.
- 02BMW Z1 (E30)BMW Group Archive
Factory-archive construction, engine, performance and 1988–1991 production data.
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.
- The tree year should begin in 1988 for production; 1989 remains the principal customer-delivery/model year.
- Prototype engines and BMW Technik studies are not regular Z1 modifications.
- 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.
2 primary references · market differences documentedPhotography: Charles from Port Chester, New York, CC BY 2.0 · 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