Porsche 911 Backdate

The vehicle in detail

“Some cars speak to you right away.
Others only once you know their story.”

This Porsche 911 is built on an original 1973 chassis (model year 1974, build date 11/01/1973) and developed with one clear inspiration: the 911 Carrera RSR 2.8.

What sets this car apart is that the build didn’t start with the exterior, but with the technology and driving experience. The engine is based on a 3.0 SC aluminum block and built to 2.8 RSR specifications, featuring 92 mm RSR cylinders, matching pistons, and mechanical fuel injection. A recent dyno test confirms 237.5 hp at 6,633 rpm. Combined with the car’s low weight, this delivers a direct and mechanical driving experience, unfiltered.

Engineering has been the guiding principle throughout the build. You notice this not only in the numbers, but especially in how the car drives. The 915 transmission has been overhauled, fitted with a short shifter, and operates exactly as you’d expect. The whole package feels tight, light, and responsive.

The suspension system complements this perfectly. With adjustable stabilizers, RS brakes, polyurethane suspension, and Bilstein dampers, the chassis is clearly tuned for feedback and control. It’s not a comfort-oriented setup, but one that matches the car’s character.

The bodywork is finished in RSR style and partially constructed with lightweight materials, featuring polyester panels and plexiglass windows. The proportions are spot-on, and the car sits exactly as it should. At Dieben Collectables, they’ve opted for a understated, timeless Carrera look without unnecessary details.

The interior is functional and in line with the car’s philosophy. RS seats, a Momo Tipo steering wheel, the right gauges, and a roll bar make it clear what this car is meant for. It’s all about driving.

Technical specs at a glance:

• 3.0 SC base engine (911/86) upgraded to 2.8 RSR specification
• 92 mm RSR cylinders and pistons
• Mechanical fuel injection (MFI)
• 237.5 hp (dyno 12-2025)
• 915 transmission, rebuilt (2017)
• RS oil pump (overhauled 2008/2009)

Since approximately 2007, the car has been thoroughly documented with invoices, photos, and maintenance records. Since 2019, maintenance has been performed by a Porsche specialist. Additionally, the car was featured in RTL GP Magazine in 2009 and photographed during a track session at Zandvoort with Jan Lammers.

Mechanically, the car is in excellent condition and drives exactly as a build of this caliber should. Cosmetically, there are slight signs of use and minor imperfections in the polyester parts. There is also an oil leak at the crankshaft seal.

Built to be driven. For someone who understands that the difference isn’t in the appearance, but rather in the way a car feels.