1988-1989 Busby Porsche 962

Images copyright Mark Windecker, Lee Self, Michael Colucci, Jeremy Banks, and Joachim Kutt
Text copyright Michael J. Fuller
Busby Porsche 962, Mid Ohio, 1989Almost as soon as customers began to receive the Porsche 962 did they begin to modify and improve upon the factory design.  One of the primary areas of development was the monocoque.  At the time there was a perceived safety concern regarding the factory 962 monocoques which were constructed merely out of folded sheet aluminum and then riveted and bonded together.  Following Pete Halsmer’s 1985 Riverside accident in the BF Goodrich 962 (962-108), Jim Busby contacted Jim Chapman about designing and manufacturing a new tub for the soon to be repaired chassis 962-108.  The Chapman tubs would be manufactured from aluminum honeycomb sheet and hence substantially stronger than OEM.  Jim Busby came to an agreement with Al Holbert and the first Chapman tub would actually go into Holbert’s 962 chassis HR1.  Busby’s repaired 962 would henceforth be chassis #962-108C, 'C' for Chapman, and would form the basis for the much modified 1988/89 Busby Porsche 962.
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1989 Busby Porsche 962 Specifications
Designer: Michael Colucci, David Bruns, Roman Slobodinskj
Layout: Mid-engine, rear-wheel drive
Monocoque: Chapman built aluminum honeycomb
Engine: Porsche 3.0 liter, flat-6, single turbo, 2 valves per cylinder, DOHC, air cooled
Horsepower: 850+ in qualifying, 800-825 in race
Torque: 495 lb-ft @ 5500 rpm
Gearbox: Porsche Type 956/62, 5-speed + reverse, synchromesh, magnesium case with magnesium bellhousing
Clutch: Sachs single-plate clutch
Steering: Rack and pinion, 1.5 turns lock to lock
Suspension: F: Upper and lower wishbones, spring/damper directly acting on lower wishbone

R: Lower wishbone, w/upper rockerarm actuating inboard gearbox mounted spring/damper
Brakes: Twin single piston caliper mounted on cast magnesium uprights.
Wheels: BBS three piece modular alloy 
F: 17 x 13 
R: 17 x 14.5
Tires: BF Goodrich T/A Radials 
F: 335/30ZR17 
R: 405/35ZR17
Length: 4770 mm
Width: 1988 mm
Height: 1049 mm
Wheelbase: 2649 mm
Front track: 1651 mm
Rear track: 1552 mm
Weights: 955 kgs
Tank capacity: 120 liters
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ęCopyright 2008, Michael J. Fuller