Price Valuation Tips for the Porsche 930

The 1989 five-speed 930 is generally considered the best-driving version. Porsche finally replaced the long-serving four-speed with the G50 five-speed for 1989. This made a meaningful difference in normal driving and helps make the final-year cars especially desirable.
The earliest 1975–76 cars and the 1979 model year have historically carried higher values than ordinary 930s. First-year European and U.S.-market cars, along with 1979 examples, have traditionally stood above more-common years in the market.
Rare colors, very low mileage and high originality can push an early 930 well above ordinary driver-car values. Desirable paint, low miles and originality are factors that move cars beyond typical driver-quality pricing.
Original paint can materially increase a 930’s value. Surviving factory paint is one of the characteristics that can move a Turbo toward the top of the market.
Concours recognition can help support a premium on a highly original 930. Meaningful concours trophies alongside original condition, rare color and very low mileage contributed to one exceptional 930 sale that helped reset the market.
Do not assume a spectacular celebrity-car result establishes the value of an ordinary 930. Steve McQueen provenance transformed the value of his 1976 Turbo Carrera. The exceptional price had much more to do with McQueen than with the car simply being a 930.
A truly significant celebrity connection can add several times the underlying car’s value. Comparing McQueen’s 930 premium with the premium paid for his Ferrari Lusso, we concluded that his provenance could multiply the value of an otherwise ordinary example.
Celebrity provenance should be supported by strong documentation. The McQueen Turbo’s story was supported by known ownership history, period accounts, magazine coverage and books. That documented connection is what turned the car into a significant piece of Porsche and McQueen history.
An original engine, original wheels and period-correct equipment strengthen an important 930. McQueen’s Turbo retaining its original engine, limited-slip differential, original Fuchs wheels and period-correct tires after restoration was an important factor in the sale price.
Factory Slantnose cars are materially more valuable than aftermarket conversions. Uncertainty over whether a Slantnose was factory-built or converted later has a major effect on value. Verification is therefore essential before paying a Flachbau premium.
Verify a Slantnose through Porsche documentation rather than appearance alone. Genuine factory cars should have supporting Porsche documentation and the correct option history. Because numerous aftermarket conversions exist, appearance by itself is insufficient.
Factory Sonderwünsche and Porsche Exclusive modifications are fundamentally different from tuner conversions. A one-off 930 built by Porsche’s own Special Wishes department as an important factory special rather than simply a modified Turbo is significant. Factory provenance can dramatically change the collector value.
Original factory documentation can be enormously important on a Sonderwünsche 930. Letters, specification sheets, factory photographs and other Porsche records established exactly how Mansour Ojjeh’s unique 930 was built and supported its status as a genuine factory special.
A famous or historically significant first owner can add value beyond the car’s technical specification. We consider Mansour Ojjeh’s ownership an important plus because of his close relationship with Porsche and TAG’s role in Porsche’s Formula One engine program.
A one-off factory specification can move a 930 into an entirely different collector category. A Porsche-built 935-style body, heavily uprated engine, competition suspension and bespoke equipment make a genuine one-off Special Wishes car fundamentally different from a standard production Turbo.
Do not let extraordinary specifications distract you from the car’s actual physical condition. We found that the one-off Ojjeh Turbo’s impressive documentation and specification could not erase its shabby condition, extensive repaint and evidence of hard use.
Inspect claimed low-mileage cars carefully for evidence that the odometer reading is believable. A supposedly 12,000-mile factory-special Turbo appeared so heavily used that our auction reporters questioned whether the odometer had gone around once. Condition should make sense relative to claimed mileage.
Heavy repainting can be a significant negative even on an historically important 930. Extensive repaint was part of the condition problems that kept a highly significant one-off Turbo from reaching its full potential value.
A neglected 930 may require a full restoration before it can achieve top value. We concluded that even the historically important Ojjeh Special Wishes car was effectively one restoration away from realizing its full market value.
Deferred maintenance on a 930 can turn a seemingly inexpensive purchase into a financial black hole. Be warned that neglected Turbo maintenance can generate huge bills even when the initial purchase price appears attractive.
Service and rebuild history are especially important on a 930 Turbo. Missing information about mileage, engine rebuilds and maintenance history directly hurts confidence and value because major Turbo repairs can be extremely expensive.
The KKK turbocharger and other 930-specific components can be expensive to repair or replace. Costly Turbo-specific repairs is one reason these cars were historically difficult to sell and why mechanical condition remains important today.
Gray-market 930s generally carry a value penalty compared with equivalent U.S.-market cars. Gray-market cars historically suffer a discount of roughly 25% or more against comparable official U.S. cars.
Check emissions and registration legality before buying a gray-market or non-U.S. 930. One Slantnose reviewed by our reporter could not legally be sold in California because of emissions requirements. Legal compliance can materially affect where the car can be registered and therefore its marketability.
A questionable title or CARFAX history can hold back an otherwise desirable 930. We believe a theft-recovery history and unusual CARFAX likely made some bidders reluctant even though the Slantnose itself was highly desirable.
A recent major service with invoices can materially strengthen a 930 at sale time. An $11,000 Porsche-dealer service completed shortly before auction, with invoices included, reduced the buyer’s immediate mechanical uncertainty.
Original books, toolkit and other factory accessories add desirability. The original owner’s manuals, toolkit and other accompanying pieces are positives on a well-preserved collector-quality 930.
Factory paint markings, labels and stickers underneath the car are strong originality clues. An undercarriage that retained factory paint marks and stickers is evidence that can help distinguish a preserved car from one that has been extensively restored or repaired.
The 1978 3.3-liter cars are mechanically improved over the earlier 3.0-liter Turbos. Porsche increased displacement, added an intercooler and fitted substantially better brakes for 1978, making the second-generation cars more powerful and developed.
Early 930s have serious lift-throttle and oversteer characteristics that buyers should respect. The early Turbo was extremely tail-happy and notes that severe oversteer could be induced easily. Driver skill and appropriate tires and suspension condition matter.
A 930’s performance reputation should not be confused with track suitability. Despite spectacular straight-line speed, the early Turbo was a heavy luxury-oriented road car and not inherently the best Porsche for track use.
The four-speed gearbox is a drawback compared with the 1989 five-speed. The later five-speed makes a noticeable improvement in regular driving and treats the earlier four-speed as a negative when comparing otherwise desirable cars.
Factory Slantnose rarity does not automatically guarantee top-tier Porsche value. Flachbau cars are genuinely rare but historically have not enjoyed the same must-have status among serious Porsche collectors as cars such as the Carrera RS, 959 or 904.
Rarity matters only when collectors actually desire the rare specification. Only about 625 factory Flachbau 930s were produced, yet rarity alone did not initially translate into exceptional values because deep-pocketed Porsche purists were not universally attracted to them.
Taste-sensitive colors can either help or hurt a Slantnose’s value. The unusual Nougat Brown/Mahogany combination was not to everyone’s taste, illustrating how color can affect demand even on a rare factory Slantnose.
The 1989 factory Slantnose coupe is particularly rare. Only a few dozen North American 1989 Slantnose coupes were produced, combining the rare M505 body with the desirable final-year five-speed drivetrain.
Highly optioned factory-original cars can command a premium. Limited-slip differential, short shifter, sunroof, upgraded seating and other documented factory options helped make this 1989 Slantnose particularly desirable.
Do not assume the 930 market will move in a straight line. Turbos have experienced major cycles of appreciation and stagnation, and that momentum-driven price increases can reverse quickly.
One exceptional auction result should not automatically reset the value of every similar 930. There have been several periods when unusually strong individual sales were followed by much more ordinary prices. Celebrity provenance, exceptional originality and competitive bidding can create outliers.
At the top of the 930 market, specification, originality, documentation and provenance matter more than simply owning a Turbo. SCM’s auction reporter reviews consistently distinguish ordinary production cars from exceptional examples with rare factory options, special colors, low miles, original condition, complete history or important ownership provenance.

Valuation Tips: Porsche 930