Stefan Roser who is a long time friend of Alois Ruf's and worked for Ruf at that time was giving the Ruf Club members and friends rides around the Hockenheim track in "Yellow Bird," the original CTR (Group C Turbo Ruf). Both the car and Stefan are spectacular. Alois Ruf calls Stefan Roser "sideways Stefan," and if you have ever seen the Ruf video "Faszination" which shows Stefan Roser driving "Yellow Bird" at Nürburgring you have an idea why Ruf calls him that and what the experience of riding with him might be like. I rode around Hockenheim with Stefan for several laps and had a great time and I will have a lot more respect for races that I see at the Hockenheim circuit now.
"Yellow Bird" was built in 1987 and is the car that we have all read about in Road & Track that won the shoot-out and beat all of the worlds fastest super cars, including the Porsche 959S. "Yellow Bird" ran 211.5 mph in this top speed shoot-out at the VW proving ground. This same car went even faster, 212.5 mph, at a subsequent event held on the Nardo Racetrack. In addition to the speed records "Yellow Bird" clocked 0-60 mph in 4 second and turned the quarter mile at 133.5 mph in 11.7 seconds.
"Yellow Bird" is a light weight construction 911 with a 469 horsepower twin turbo 911 based 3.4 liter engine. For the CTR Ruf uses his own intake manifold similar in design to the Carrera manifold, but larger in capacity with the special Digital Motronic Electronic (DME) fuel injection and ignition system that was originally developed for the Porsche 962 race cars used to control the fuel mixture and ignition timing. Instead of measuring the air flow like most electronic engine management systems do this system is a pressure sensing type system which uses throttle position, rpm, engine temperature and manifold pressure as input signals. This was the first of these high powered 911 turbo engines that really ran right and made a lot of horsepower. Since "Yellow Bird" was built many of the aftermarket tuners have been utilizing various different electronic engine management systems to greatly enhance the engine performance of the turbo and now that Porsche is finally abandoning the CIS fuel systems for their next generation 911 Turbo, which will be introduced next March, the engine management situation for these engines has come full circle.
Ruf said that he has built 28 CTR's from new bare chassis with no chassis numbers purchased from Porsche and that he has also built about the same number of CTR's by converting them from existing 3.2 Carreras. The cars built from new chassis have Ruf chassis numbers and the modified cars still have their original Porsche VIN number. It is still possible to have a CTR built by Ruf as a conversion, but there are no new chassis left.
A great number of the Ruf CTR owners use them primarily for track events and there were several at the Ruf Club driving school at Hockenheim. There was also one Ruf's customers yellow CTRs at the Ruf facility for service that I looked over very closely. The Yellow CTR at Ruf's had a built in roll cage that was probably the best roll cage installation that I have ever seen in a Porsche 911. The roll cage was very unobtrusive and did not protrude into the passenger compartment hardly at all. They had upholstered over the roll cage so that it blended into the interior, the carpeting and upholstery went over the bars of the roll cage as did the cars headliner. This car also had a larger 105 liter (27.7 gallon) fuel tank that Ruf Gmbh had made for them by the original equipment manufacture who makes them for Porsche. Because the wheels and tires used on the CTR are of run flat technology no spare tire is required, so the fuel tank is made larger by omitting the indentation that would normally accept the 911 collapsible spare tire. The run flat technology wheels are either the Dunlop Denloc system or the Asymmetrical Hump system, Ruf uses both. The yellow Ruf CTR at Ruf's facility also utilized a number of Kevlar parts to help reduce the weight of the car. The doors, front trunk lid, front fender and front and rear bumper were all made of Kevlar composite. The fit and finish of the body and Kevlar panels was exemplary, it was impossible to tell by looking that the car didn't have the standard Porsche steel panels. Ruf also offers aluminum doors hood and front fenders as an options to the standard steel and the more expensive Kevlar composite parts.