1993 Joest Porsche 962C

Text & images copyright Michael J. Fuller

Vintage Sebring 1991 Joest Porsche 962C, Copyright Mike Fuller 2003Sebring 1991.  With the help of Norbert Singer Joest had abandoned the factory tail in favor of a remote rear wing which, at the very least, allowed a greater freedom of adjustment as well as improved aerodynamics. 
Joest Porsche 962C, Sebring, 1993, Copyright Mike Fuller 2003Sebring 1993.  The Joest team had been busy (again with the help of Norbert Singer).  The front nose notch had been filled in and air management exiting the front wheel well was revised.  Joest abandoned the Kamm-ish rear end for a duck bill and complemented the package with a rather impressive twin tier rear wing.
Joest Porsche 962C, Road America HSR, 2002, Copyright Mike Fuller 2003The "Red Baron" wing worked as two devices in one.  The upper plane functioned as a standard wing, running in the cleaner air at the maximum legal height.  It could be run flatter for the same level of downforce but less drag.  The bottom tier functioned as a under wing extractor, enhancing the downforce generated by the tunnels.  Notice that the main plane elements for both the top and bottom tiers are the same profile while the flaps are of dramatically different chord.  DPS manufactured the wings, endplates, and mounts.
Joest underbody, Atlanta, 1993, Copyright Mike Fuller 2003With all the work that Joest had done to the top sides it was surprising to see that the underbody was still pretty much as the factory had developed.  Notice the metal sheets showing where the engine resides.  Another thing that should be pointed out is the width of the Porsche flat-six motor and how it really effected the packaging of the underwing.
Joest Porsche 962C, Atlanta, 1993, Copyright Mike Fuller 2003Another view of the Joest 962C.  The vents behind the front wheel well have been covered up to just a thin slit.  A gurney lip has also been added to the front of the slit to improve air extraction and increase front end downforce.
Joest Porsche 962C detail, Atlanta, 1993, Copyright Mike Fuller 2003The cooling package is still pretty conventional.  Coolers being located in the side pods and being fed by vents in the upper surface.  Some of the air is then exhausted out via vents in front of the rear wheels, the rest exiting out the engine bay at the rear.  Notice the periscope turbo intake.
Joest Porsche 962C, Atlanta, 1993, Copyright Mike Fuller 2003Large dive planes have been added to the nose to further augment front end grip.  Note the thin splitter across the front.

Wind tunnel development of the Joest Porsche 962C was carried out at the Porsche Weissach tunnel (full scale fixed-floor with boundary layer suction).  According Ralf Jüttner, Technical Director for Joest Racing, maximum downforce for the Joest 962 was 5584 lbs. for 1396 lbs. drag (max L/D: 5281 lbs. downforce for 1200 lbs. drag).  Jüttner also mentioned that, "In general, I think we were quite far off the downforce values of the Nissan and the Toyota.  Anyway, I do know that downforce figures from the Weissach tunnel showed smaller values compared to other tunnels.  But regardless, there was no way coming close to the Toyota as we could personally see large differences in the braking points for the first chicane at Portland for example." 

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©Copyright 2003, Michael J. Fuller
"Its marvelous to go so very fast!"