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Kremer K4 (Porsche 935)

Kremer K4 (1981)

Using factory 935/78 ‘Moby Dick’ plans, 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.

Specs & Performance

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
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, Anti-Roll Bar
r suspension
Double Wishbones w/Bilstein Dampers, 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