D-Production: Killer 924

The Sports Car Club of America was the destination for the Porsche 933, otherwise known as the 924 D-Production Race Car.  Introduced a factory “kit” race car in 1979, the basic 924 got suspension, engine and transmission upgrades in a “body in white” stripped-down body.  Customers could build the car and compete in SCCA’s D-Production (DP) class, and between 1979 and 1982, they did very well.  Al Holbert was one of the top competitors in DP with his 924.

The DP body modifications have always been intriguing.  Unlike the Carerra GT with its 944 front fenders, the DB has flares at the wheel wells only to allow for a wider stance and wider wheels and tires.  The basic body shape was retained, but as a race car, all the creature comforts were eliminated.  So here starts the Project 924 DP.

CCP FAB carThe car pictured here is a 1988 924S build with the M030 package, meaning that it has no sunroof, crank windows, and other such options and deletes.  The car is in great mechanical shape, but the interior isn’t great.  The front fenders are missing, and the wheels that came on the car are not stock/standard, so this is a good platform to do this project.

Many years ago we acquired a DP kit (parts in white) from CCP Fabrication in New Port Richey, Florida.  Knowing that it was going on a street car, Paul made the glass extra thick to withstand the rigors of street driving – weight isn’t an issue.  The fit and finish of the parts is really great – the quality is fantastic.

So with using the 924S as the starting point, we want to make this into the “ultimate 924.”  That means making some upgrades.

  • Replace the air conditioning and heat system with a Vintage Air unit under the dash.  The VA unit is smaller than the current AC/Heat units and much more efficient.  Plus, all the controls are electronic with no more sliding cables and doors.
  • Remove the rear seat and install a four-point roll bar with harnesses and race-type seats and complete carpeting.
  • Suspension upgrades to include Koni adjustable shocks, front coil-overs, plastic bushings and Weltmeister sway bars.
  • Recover the dashboard in leather from J-F Customs in the U.K.
  • Create some RS-style door panels for that race car/minimalist look.
  • digitaldashInstall a Dakota Digital analog gauge panel where the three-gauge panel currently resides.  (This moves the oil pressure gauge to in front of the steering wheel.)
  • Rebuild the center console stack to house the controls for the Vintage Air near the bottom, then install a double-din screen radio equipped with Apple Car-Play.
  • Fresh black paint, Fuch replica 16″ wheels.

This is a long term project, but done mostly with parts and pieces that we already have in the “prize stash.”  It will be a one-of-a-kind!

NOTE: The Vintage Air HVAC system is not a plug-and-play kit, so we will have to figure out how to make it work.  We have installed a couple of these in classic and kit cars, so we are confident that we can make it work.  We will document the installation, so watch here to see what it will take to make this upgrade!


Kevin Duffy


Author: Kevin Duffy, Author and Chief Geek

Kevin Duffy is a retired Associate Professor of Criminal Justice at Daytona State College in Florida and a dedicated car guy. He now spends his time with Porsche 924S, 944's and 968's in his backyard shop. He is active in the Porsche Club of America, and he concentrates on 924S and the 924S Special Editions, doing rescues and restorations.

2 thoughts

  1. Hello Kevin,this Paul from CCP fabrication. I am in search of a 4:11 ring and pinion for our 924s race car. I have heard some Audi models fit. Have you heard of anybody that has done the conversion? And if it is a Audi, which model. Thanks.

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