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Kremer K3 (Porsche 935)

Kremer K3 (1977)

In 1977 Kremer sufficiently improved the 935 to begin series production of their own version. It was the third Kremer built on Porsche’s successful platform and many 935/934s were updated to reflect ideas from the brothers in Cologne.

Erwin and Manfred Kremer were well versed in upgrading Porsches and running against factory-built cars. They started racing since the inception of the 911 and made their own versions of a RSR from a bodyshell. The K3 version of their 935 was a great success and won the 1979 24 Hours of Le Mans, 1980 Sebring 12 Hours outright.

There’s no doubt Kremer was influenced by the 1977 works factory cars and included some of the new features on the K3. These included the reshaped rear profile which used a second window and running boards which better controlled air underneath the car. Unlike Porsche’s fibreglass, Kremer opted for Carbon-Fiber/Kevlar composite. These were made by Design Plastics.

Kremer redesigned the engine cooling system that removed the water-to-air inter-cooling system with and air-to-air unit. Kremer racing manager Achim Stroth recalled “the secret of the K3 was the air-to-air intercooler and the ducting to the engine bay that the bodywork allowed. At the start of the races, the George Loos cars were as quick as our K3 but after a few laps, their engines ran hotter and the power fell off whilst ours kept on producing as much power.”

The engine itself was highly developed. Bored and stroked to 3163cc, 800 bhp was possible at 1.7-bar boosts while the reliable 1.4 bar ran 740 bhp all day long.

Achim also mentioned they “Lowered the car four centimeters by turning the gearbox upside-down…By moving the gearbox, we also made it possible to change the gears without taking out the engine. The factory was supplying new brakes but we chose ones that were 40% wider, so we would not have to change them in a 1,000 kilometer race.”

Klaus Ludwig had a great time with his K3 in the German Nation Championship. He won 11 of 12 races. Many famous teams fielded these cars including Dick Barbour, Gelo Team, ASA Cachia, Sekurit Racing.

In total Kremer sold 13 turn-key cars and offered a kit to upgrade a factory-customer 935 to K3 specification.

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 3163 cc / 193.02 in³
bore 95 mm / 3.7 in
stroke 74.4 mm / 2.9 in
compression 7.2:1
596.6 kw / 800 bhp @ 8000 rpm
specific output 252.92 bhp per litre
bhp/weight 780.49 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


1977 Kremer K3

1977 Kremer K3