Porsche 928 S4: A Masterclass in V8 Performance and Luxury Engineering
The moment the 5.0-liter V8 in the Porsche 928 S4 comes alive with a subdued, sophisticated growl, you understand it was engineered not just for speed, but for effortlessly devouring continents.
TL;DR
The Porsche 928 S4 (1987-1991) is the definitive evolution of Porsche’s groundbreaking front-engine V8 grand tourer. It masterfully blends 320 horsepower of refined, all-aluminum V8 performance with unparalleled long-distance luxury, advanced (for its time) technology, and iconic, aerodynamic design. It represents a unique and underrated chapter in Porsche’s history, offering a compelling blend of analog driving satisfaction and timeless GT appeal.
Key Takeaways
- The Pinnacle of a GT Legend: The S4 variant is the most refined and widely desirable version of the 18-year 928 lineage, boasting significant styling and engineering updates.
- A Symphony of German Engineering: Its 5.0L 32-valve V8 delivers 320 hp and a massive 317 lb-ft of torque, providing effortless, silky performance perfect for high-speed cruising.
- A Technological Time Capsule: For its era, it was packed with innovations like a standard tire-pressure monitoring system, advanced onboard diagnostics, and an aerodynamic design that resulted in a low 0.34 drag coefficient.
- The “Smart Buy” Classic: Often more affordable than contemporary 911s, the 928 S4 offers immense performance and luxury for the money, though its complex electrical systems demand careful inspection.
Porsche 928 S4: A Masterclass in V8 Performance and Luxury Engineering
In the Porsche pantheon, where the rear-engine 911 has always been the unrivaled star, the 928 S4 occupies a unique and revered space. It was born from a bold vision: to create the ultimate grand tourer, a car that could cross continents at triple-digit speeds in near-silent comfort while still thrilling on a mountain pass. Originally conceived as a potential successor to the 911, the 928 carved its own legacy as a technological flagship. The S4, introduced for the 1987 model year, represents this concept perfectedāa harmonious fusion of muscular V8 performance, futuristic luxury, and groundbreaking engineering that feels both of its time and remarkably prescient.
To understand the S4’s place in the 928’s story, it’s helpful to see its evolution within the broader timeline of Porsche’s front-engine grand tourer.
The Heart of the Matter: Engineering the S4’s Legendary V8
At the core of the 928 S4 experience is its magnificent, all-aluminum 5.0-liter V8. This wasn’t just a larger engine; it was a comprehensive re-engineering. While earlier 928s used single-overhead-cam designs, the S4’s powerplant (codenamed M28/41 for manuals) featured double overhead camshafts and four valves per cylinderāa first for the 928, allowing it to breathe with incredible efficiency.
Key technical advancements created an engine renowned for its flexibility and smooth power:
- Two-Stage Intake Manifold: This clever system used a long intake tract for strong low-end torque below 3,500 RPM. Above that, a butterfly valve opened a shorter tract, ramming more air in for a powerful top-end rush.
- Fat Torque Curve: The engineering focus was on usable power. With 317 lb-ft of torque available at just 3,000 RPM, the S4 pulls with immense authority from almost any speed, making it feel effortlessly fast in real-world driving.
- Refined Performance: Contemporaneous road tests celebrated its character. Car and Driver noted it wasn’t “boisterous or blustery” but “sublime,” a GT car that prioritized smooth, relentless thrust over dramatic theatrics.
The 928 S4’s V8 was so robust that a stock-engine example, modified only for aerodynamics, set a world speed record of over 171 mph at the Bonneville Salt Flats in 1986.
A True Gran Turismo: Luxury, Technology, and Transaxle Dynamics
Porsche engineered the 928 S4 to be a “land missile for the luxury set.” Its front-engine, rear-transaxle layoutāwhere the gearbox is mounted at the rear, connected to the engine via a torque tubeāgives the car a near-perfect 50:50 weight distribution. This foundational choice is key to its unique character: it combines the spacious, quiet cabin of a front-engine car with the balanced, agile handling of a mid-engine sports car.
The cabin is a masterpiece of focused, driver-centric ergonomics from the late 1980s. The entire instrument pod moves with the telescoping steering wheel, ensuring a perfect view at any seating position. The seats were famously comfortable for long journeys, with available “Positrol” memory functions. For its time, the technology list was staggering:
- Standard Tire Pressure Monitoring: An industry first in a production car, highlighting Porsche’s focus on high-speed safety.
- Advanced On-Board Computer: From the 1989 model year, an LCD display provided extensive vehicle data and diagnostics.
- Complex Comfort Electronics: Power everything, automatic climate control, and a premium sound system were standard, fulfilling its role as a luxury liner.
However, this complexity is the S4’s primary caveat for modern owners. The extensive 1980s wiring looms, proprietary connectors, and numerous relays are now a common source of “electrical gremlins” that require patience and specialized knowledge to troubleshoot.
The 928 S4 in the Porsche Lineup: A Comparative View
To understand the S4’s value and position, it’s useful to compare it with its stablemates from the same era. The table below shows how it stacked up against other performance Porsches of the late 1980s and early 1990s.
| Model & Years | Vehicle Type | Powertrain | Key Features | Approx. Starting Price (Then) & Market Value (Now – Good Cond.) |
|---|---|---|---|---|
| Porsche 928 S4 (1987-91) | Front-Engine, 2+2 GT Coupe | 5.0L DOHC V8, 320 hp, 5-spd Manual / 4-spd Auto | Ultimate luxury GT, advanced tech, transaxle balance, iconic pop-up headlights. | Then: ~$64,208 |
| Porsche 911 Carrera 3.2 (1984-89) | Rear-Engine, 2+2 Sports Coupe | 3.2L Air-Cooled Flat-6, ~231 hp, 5-spd Manual | Purist icon, analog driving experience, timeless 911 shape and sound. | Then: ~$45,000 |
| Porsche 944 Turbo (1986-91) | Front-Engine, 2+2 Sports Coupe | 2.5L Turbocharged I4, 217-247 hp, 5-spd Manual | Balanced handling, “entry-level” performance, popular track car. | Then: ~$35,000 |
| Porsche 928 GT (1991-92) | Front-Engine, 2+2 GT Coupe | 5.0L DOHC V8, 326 hp, 4-spd Auto Only | More track-focused S4 variant, stiffer suspension, limited production. | Then: ~$85,000 |
Always use the 928 S4’s formidable performance responsibly. Its high-speed stability is legendary, but it is a classic car without modern stability aids.
What to Know Before You Buy: Ownership Realities
The 928 S4 is often called a “smart buy” in the classic Porsche world. You get phenomenal engineering and presence for less than a comparable-condition 911. However, smart buying is critical.
The Major Watchpoints:
- Electrical Systems: As mentioned, this is priority one. A pre-purchase inspection must test every switch, motor, relay, and gauge. Intermittent faults are common and can be time-consuming to fix.
- Engine & Timing System: The DOHC engine’s timing belt and related components are critical. Failure is catastrophic. Proof of recent, specialist replacement is mandatory.
- Body & Trim: While the body is galvanized and features aluminum doors/hood, check for rust in the windshield frame, sunroof drains, and rear window seal. The large rear hatch seal is notorious for shrinking and causing wind noise or water leaks.
- Automatic vs. Manual: The 4-speed automatic (a Mercedes-Benz unit) is surprisingly good and suits the car’s GT nature. The 5-speed manual offers more engagement. Note: For the 1990 and 1991 model years, the S4 was automatic-only.
The 928 S4 isn’t a car you simply park in any garage; it’s a machine that demands a relationship with an owner who appreciates its complex soul and a specialist mechanic who understands its intricate wiring.
Frequently Asked Questions
Is the Porsche 928 S4 a reliable classic car?
Its mechanical components, especially the V8 engine, are robust. Its primary weaknesses are the complex 1980s electronics and aging plastic/rubber components, which require diligent maintenance and can lead to frustrating intermittent faults.
Is the 928 S4 expensive to maintain?
Routine maintenance costs are comparable to other classic German performance cars. However, repairs to the electrical system, automatic transmission, or climate control can be very expensive if you don’t have a specialist familiar with the model. DIY is possible but requires deep technical knowledge.
Why is it considered “underrated”?
For years, it was overshadowed by the iconic 911 and misunderstood by purists for its front-engine, water-cooled V8 layout. Today, enthusiasts recognize it as a technologically bold, brilliantly engineered, and supremely capable grand tourer that represents a unique peak in Porsche’s history.
How does it drive compared to a modern sports car?
It feels heavier and larger than a modern 911, with more deliberate steering inputs. However, its balance is superb, its torque is addictive, and its high-speed stability is phenomenal. The experience is more analog, luxurious, and relaxed than in a razor-sharp modern sports car.
What is a good price for a 928 S4 today?
A driving project can be found for $15,000-$25,000. A clean, well-sorted example typically ranges from $35,000 to $55,000. Exceptional low-mileage or special models (like a late manual) can command higher prices.
Was it really faster than a 911 Turbo of its day?
In a straight line, particularly at very high speeds, yes. The 928 S4’s top speed was a key performance metric, with Porsche officially claiming 168 mph for the manual, and independent tests recording up to 171 mph in record-setting conditions.
Where is the best place to find one for sale?
Beyond general classic car sites, dedicated forums like Rennlist’s 928 section and the 928 Owners Club are essential resources. Buying from a knowledgeable enthusiast within the community often yields the best results.
Final Thoughts
The Porsche 928 S4 is not the choice for the purist seeking a raw, air-cooled anthem. It is the choice for the discerning driver who values a different kind of genius: the genius of synthesis. It masterfully blended brutal V8 power with serene comfort, wrapped it in a timeless, aerodynamic shell, and filled it with technology that was a decade ahead of its time. To drive one is to experience Porsche’s ambitious and uncompromising vision for the ultimate grand tourer.
It remains, as one period review declared, “the very definition of what a GT should be”. In an age of increasing digital abstraction, the tangible, analog, and deeply satisfying experience it offers is more special than ever.
Which Porsche engineering philosophy speaks to you moreāthe rear-engine purity of the 911 or the grand touring synthesis of the 928 S4? Share your thoughts in the comments.
References:
- Car and Driver: 1987 Porsche 928S4 Archive Test – A comprehensive contemporary road test highlighting performance and driving character.
- Excellence Magazine: 1989 928 S4 Specs – Detailed technical specifications for the model.
- Elferspot: Porsche 928 S4 Buyer’s Guide – An essential guide covering common issues, inspection points, and ownership advice.
- Stuttcars: Porsche 928 S4 (1987-1991) Ultimate Guide – In-depth historical and technical analysis of the S4’s development and features.
- Supercar Nostalgia: Guide to 928 S4, Club Sport, SE & GT – Detailed historical and technical appraisal of the S4 and its variants.
