Market Segment:
Luxury Performance Sports Coupe
Positioning:
High-performance, track-capable grand tourer with a focus on driver engagement and build quality.
Primary Competitors:
Ferrari 328 GTB, Chevrolet Corvette C4 (ZR-1 variants), Nissan 300ZX Z31 (late models), Toyota Supra Turbo (MkIII).
Powertrain:
Turbocharged inline-four cylinder engine, rear-wheel drive, transaxle layout for optimal weight distribution.
Design:
Aerodynamic styling, Porsche's characteristic build quality, advanced (for its time) suspension and braking systems.
Manual Value Proposition:
Essential tool for diagnosing and resolving complex electrical issues, saving significant labor costs.
Primary Focus:
Bosch DME (Digital Motor Electronics) and related electrical systems
Secondary Focus:
General electrical troubleshooting, wiring diagrams, component identification
Estimated Pages:
N/A (wiring diagrams are typically a series of sheets or a comprehensive booklet)
Type:
Wiring Diagram Manual / Electrical Troubleshooting Manual
Format:
Likely Printed Booklet or High-Resolution Scanned PDF
Engine Management:
Bosch DME L-Jetronic/Motronic variants, fuel injection, ignition system, boost pressure control
Lighting:
Headlights, taillights, interior lighting, fog lights
Instruments Gauges:
Speedometer, tachometer, fuel gauge, oil pressure, voltmeter, boost gauge
Comfort Convenience:
Power windows, power mirrors, central locking, climate control (HVAC blower, basic functions)
Audio:
Factory radio wiring, speaker circuits
Safety Systems:
ABS (Anti-lock Braking System) electrical circuits, turn signals, hazard lights
Chassis Electronics:
Wiper/washer system, horn, starter system, charging system
Troubleshooting:
Systematic diagnostic procedures for electrical faults, symptom-based troubleshooting
Wiring Identification:
Color coding, wire gauge, connector pinouts
Component Testing:
Testing of sensors, actuators, relays, fuses, and electrical modules
Repair Guidelines:
Instructions for repairing wiring harnesses, replacing connectors and components
Depth:
Detailed, suitable for experienced technicians and knowledgeable DIY enthusiasts
Diagnostics Level:
Advanced electrical diagnostics, circuit analysis
File Format:
Likely PDF (if digital) or high-quality print
Print Quality:
High resolution, clear line drawings and text (assumed for usability)
Binding Type:
Spiral bound or saddle-stitched (for print versions to lay flat)
Paper Type:
Durable, matte finish paper suitable for workshop environments (for print versions)
Engine Type:
Inline-four, turbocharged, intercooled
Displacement:
2479 cc (2.5 Liters)
Bore X Stroke:
104.0 mm x 73.0 mm
Horsepower:
247 hp (184 kW) @ 6000 rpm
Torque:
282 lb-ft (383 Nm) @ 4500 rpm
Fuel Delivery:
Bosch L-Jetronic fuel injection with Bosch Motronic engine management
Fuel Type:
Premium Unleaded Gasoline (91+ Octane)
Ignition Type:
Distributorless ignition system (DIS) managed by Motronic ECU
Cooling Type:
Water-cooled, thermostatically controlled fan
Type:
5-speed manual transaxle
Type:
Tiptronic automatic (less common on 951, more prevalent on 944 S2, but early S2 could have it)
Layout:
Rear-mounted transaxle for transaxle layout (engine front, gearbox rear)
Fluid Type:
API GL-4 or GL-5 gear oil (refer to specific Porsche manual for exact spec, e.g., 75W-90)
Crash Test Results:
No formal NHTSA or IIHS ratings available for this specific model year, but known for robust chassis design.
ABS:
Standard Bosch ABS (Anti-lock Braking System)
Braking System:
Four-wheel disc brakes, ventilated front and rear, often with M030 option for larger calipers/rotors.
Airbags:
Driver-side airbag (standard for later production models/market regulations)
Seatbelts:
Three-point retractable seatbelts
Chassis Structure:
Reinforced safety cage structure, crumple zones
Oil Change:
Every 5,000-7,500 miles or annually, whichever comes first. Use synthetic oil.
Timing Belt:
Every 30,000-50,000 miles or 3-5 years. Critical maintenance item.
Spark Plugs:
Inspect at 15,000 miles, replace as needed (typically every 30,000 miles).
Engine Oil:
API SG, ACEA A2/B2 rated synthetic oil, 10W-30 or 5W-40 recommended (e.g., Mobil 1 5W-30/40 or equivalent).
Coolant:
50/50 mix of Porsche-approved G12 coolant and distilled water.
Brake Fluid:
DOT 4 or DOT 5.1, low-moisture content.
Electrical Concerns:
Degradation of wiring insulation (especially around engine bay and rear hatch), faulty headlight relays, coolant level sensor issues, ABS sensor failure.
Mechanical Concerns:
Timing belt failure (catastrophic engine damage), fuel pressure regulator issues, clutch wear, potential for oil leaks (e.g., rear main seal).
Turbo System:
Wastegate actuator issues, intercooler leaks, turbocharger wear.
Heritage Summary:
Porsche's legacy of motorsport success and engineering excellence.
944 Lineage:
The 951 (944 Turbo) is the high-performance variant of the Porsche 944, which itself evolved from the 924.
951 Introduction:
Introduced in 1985 for the 1986 model year, the 951 brought significant performance upgrades to the 944 platform.
Production Years:
1986-1991 (for the 944 Turbo/S2 generation)
Manufacturing Location:
Neckarsulm, Germany (Audi AG plant, contracted by Porsche)
