The Ruf CTR
also known as the CTR Yellowbird
or simply Yellowbird
, was a limited-production, high performance sports car
produced by Ruf Automobile
Introduced for the 1987 model year and based on the Porsche 911
, the CTR featured an enlarged and highly tuned version of Porsche's 3.2 litre flat-six cylinder engine, lightened body panels, an integrated roll cage (adding chassis stiffness in addition to occupant safety), upgraded suspension and braking systems, a custom-designed transmission, and several unique trim pieces such as polyurethene bumpers, and the use of the fender-mounted oil filler (a Porsche feature for the 1972 MY only) necessitated by relocating the oil tank forward to clear the intercooler on that side.
Much attention was given to aerodynamic considerations, with the body being de-guttered/seam welded and the use of filler panels for the door pillars and 935-style mirrors. Prototype models had NACA-style intercooler intake ducts over the rear fenders (later dropped, as it was discovered that air was pulled out, rather than in, at speed due to a low-pressure area), while later models had additional slots in the rear bumper corners for the air to exit.
Developing and of torque and weighing in it at only , the CTR provided stellar performance, with a 0-60 mph time of around 3.7 seconds and a top speed in excess of . Although a small group of vehicles such as the Ferrari F40
and Porsche 959
were faster to , the Yellowbird could... Read More