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Porsche 935 K3 Brands Hatch Debut for DSD Motorwerks

by | Sep 24, 2014 | Classic Porsche Blog, Race and Rally

Essex legend and friend of Ferdinand, Dave Dennett, recently debuted his 935 K3 replica at the Porsche Club national event. The 935 was on track at Brands Hatch amongst a plethora of Porsche Rennsport machinery, where Gary Hand Motorsport Photography got some excellent photos.

DSD Motorwerks Porsche 935 K3 build

The 935 came to Dave’s DSD Motorwerks a while back, in a part exchange deal against a 964 race car. Then painted black, the shell had started life as a left-hand drive 1986 3.2 Carrera with 45k miles on the clock, imported to the UK from Japan in 2011.

DSD Motorwerks Porsche 935 K3 2

With a single turbo flat six making 650 bhp and a dog box G50 with 80% LSD, it’s an obviously complex machine. The body uses mostly DP Motorsport parts but, under that skin, the rust free shell has been comprehensively modified.

DSD Motorwerks Porsche 935 K3 4

935 running gear needs a lot of space, so the rear panel was cut and replaced with an engine brace and rear frame, allowing room for the giant turbo. The front end lost all of its roadgoing parts, to be replaced by a single-piece 935 K3 clamshell. A custom rollcage makes it stiffer: much needed when you stick 650 horsepower through a production 911 bodyshell almost thirty years old.

DSD Motorwerks Porsche 935 K3 9

The engine spec is interesting. 930 crankcases were gas flowed and shuffle pinned. The 930 std/std crankshaft was fitted with Carrillo rods with 22mm little ends for Omega 935 CTR pistons. Capricorn barrels mate to 930 heads, ported and twin plugged. Schrick cams run Motorsport rockers, as Dave tells Jürgen Barth here:

DSD Motorwerks Porsche 935 K3 Jurgen Barth

The inlet is modified 3.2 Carrera with ‘big’ injectors. Turbo is a Garrett ball race GT45, with a Turbosmart wastegate and bespoke intercooler. An Omex 710 ECU controls the motor, which breathes out through a custom exhaust. “You can’t buy these pipes from Kwikfit, Derek,” says David.

DSD Motorwerks Porsche 935 K3 Derek Bell

Originally built by Ninemeister, the engine was subsequently rebuilt by CTR and tested at 600bhp on the Judd engine dyno. Dave has since made a few more modifications and the latest dyno run produced 650bhp. I’m hoping to attend some test sessions with the car in the near future: should be a lot of fun, as there is never a dull moment with Dave in the house!


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