Available for auction is this 1987 Porsche 928 S4 track car finished in Dark Blue Metallic. Under the care of its previous owner, an aircraft engineer, no expense was spared in extensively upgrading this 928 for track use before it was acquired by the seller earlier in 2022. The 5.0-liter V8 engine has been upgraded to produce approximately 600 HP thanks to a ProCharger D-1SC supercharger, Bosch 42 lb. fuel injectors, a custom cooling system, an Electromotive Tec-3 ECU, and more. The body’s aerodynamics have been improved while track performance modifications have also been made to the cabin, driveline, brakes, and suspension. Previously listed on PCARMARKET, this 928 is now being offered for auction by its seller out of Wisconsin with approximately 33 hours since the completion of the build.
The body of this 928 wears a Dark Blue Metallic finish and has been extensively modified with splitters, wings, cooling ducts, and more. All four-wheel arches were trimmed and fitted with bolt-on flares to accommodate larger tires. Louvers have been added to both the front fenders and hood and provide airflow to a large oil cooler and side wing radiators. The headlights have been removed to create additional airflow and all air inlets and outlets including front bumper openings have been covered with a stainless-steel wire grating. The seller notes the finish shows minor chips and has provided a collection of images for reference in the gallery along with a clean CARFAX report. Additional modifications include custom steel underbody skid plates, a custom engine bay skid plate, a custom front splitter, a mechanically adjustable carbon fiber rear wing, an aluminum sunroof delete plate, pinned hood and rear hatch locks, a single driver-side windshield wiper, slim profile side mirrors, and a Lexan rear window. It rides on a set of modular race wheels dressed in a set of racing slicks, however, the seller notes that a total of 25 tires and 12 mounted wheels will accompany the car including a new set of racing slicks, a set of Michelin Pilot Sport Cup 2 tires mounted on yellow wheels, a set of Toyo R888 mounted on Fuchs style wheels, a set of Continental rain racing tires, and others.
The cabin has been completely stripped and painted black to accommodate additional motorsport equipment while also saving weight. Features include a full weld-in roll cage, a Lifeline fire suppression system, two Kirkey racing seats with RJS 5-point racing harnesses, removable Lexan door windows, a short throw solid ball mount shifter linkage, a MOMO flat-bottom alcantara removable steering wheel, a Roadkeeper two-camera video and data logging system, and a hard mounted tablet and hard mount for a removable laptop. A suite of aftermarket instrumentation has been installed as seen in the photo gallery. The original adjustable gauge pod has been retained and is noted to show a small crack.
Power comes from a 32-valve 5.0-liter V8 engine that has been extensively upgraded with a custom-mounted ProCharger D-1SC centrifugal supercharger, a large custom Mishimoto air-to-air intercooler, pre and post-intercoolers, and a 13.5-quart oil capacity. An estimated 600 crank horsepower (525 WHP) is sent to the rear wheels by way of a rebuilt and upgraded 5-speed manual transaxle equipped with a carbon fiber racing clutch, an 8-plate limited-slip differential, Aeroquip lines, Tilton pump, and upgraded cooler and fan. A spin-on filter was also added for the transmission fluid along with pressure and temperature gauges. Other engine and driveline upgrades include a fully wrapped custom 3” stainless steel dual exhaust, an Electromotive Tec 3 dual-ignition electronic control system and ECU unit, Bosch 42 lb. fuel injectors, a custom cooling system with three radiators and an additional electric water pump, a 3-quart Accu-sump engine oil supplement system, an extended capacity oil pan, a Porsche GT2 oil cooler, a transaxle oil cooler, and more. The suspension has been upgraded with Bilstein adjustable coilovers, adjustable sway bar end links, and a custom 3-piece frame cross member, while the original brake calipers were rebuilt, and stainless-steel brake lines were installed. The transmission has been rebuilt and a Gates long-life racing timing belt was installed 33 engine hours ago. The seller notes a louder interchangeable exhaust pipe also accompanies the sale.
This sale will include additional wheels and tires, three binders documenting the build, racing logs, and a clean title.