1981 Kremer K4

Using factory plans of the 935/78 ‘Moby Dick’, Kremer built their own version. In doing so they modified the body to their own design to include more downforce.

Only two cars were built in K4 specification. Bob Wollek drove the first car to win the Porsche Cup in 1981. Later this car was sold to John Fitzpatrick Racing and driven by John Fitzpatrick and David Hobbs to many successes in the IMSA series. The car was further modified by AIR with intakes on top of the front fenders and numerous detail differences. This helped the car win the Riverside 6-Hours and four more races in 1982.¹. K4/01 It was raced up until the 1984 Sebring 12-Hours were it placed 6th overall.

The second car was built for Interscope by was never raced due to overheating issues in testing.

1981 Kremer K4 Gallery

In Detail

type	Racing Car
built at	Cologne, Germany
engine	Type 930/80 Boxer-6
position	Rear, Longitudinal
aspiration	Twin KKK Turbochargers
block material	Aluminum
valvetrain	SOHC, 2 Valves perCyl
fuel feed	Bosch-Kugelfisher Mechanical Fuel Injection
displacement	2994 cc / 182.71 in³
compression	7.2:1
power	671.1 kw / 900 bhp @ 8000 rpm
specific output	300.6 bhp per litre
bhp/weight	878.05 bhp per tonne
body / frame	Unitary Steel Monocoque w/Carbon-Kevlar Panels
driven wheels	RWD
front brakes	Ventilated Discs w/4-Piston Calipers
rear brakes	Ventilated Discs w/4-Piston Calipers
front wheels	F 40.6 x 26.7 cm / 16 x 10.5 in
rear wheels	R 48.3 x 38.1 cm / 19 x 15 in
steering	Rack & Pinion
f suspension	MacPherson Struts w/Bilstein Dampers, Adjustable Anti-Roll Bar
r suspension	Double Wishbones w/Bilstein Dampers, Adjustable Anti-Roll Bar
curb weight	1025 kg / 2260 lbs
weight distro	40 % / 60 %
wheelbase	2271 mm / 89.4 in
front track	1501 mm / 59.1 in
rear track	1557 mm / 61.3 in
length	4681 mm / 184.3 in
width	1971 mm / 77.6 in
transmission	4-Speed Manual
0 – 60 mph	~3.0 seconds
0 – 100 mph	~5.8 seconds

Sources & Further Reading.

1. Starkey, John. 930 to 935 The Turbo Porsches. Gryfon Publishers: 1998.