A great period brochure for the US market that starts off with introducing prospective customers to federalized, non-grey-market importation of RUF automobiles and describes the conversion process for current 911 Turbo owners. Then some technical details about the BTR are described. It’s interesting to note the difference in top-speed as reported by RUF is 12.6 mph faster for the narrowbody than with the turbo body.
On page 6 the details get nitty gritty and although the BTR 3.4 engine conversion is rated at 374 hp at 0.8 bar of boost, it is capable of 425 hp at 1.0. Page 7 details the special camshafts and larger intercooler and their benefit to the whole system.
Page 8 and 9 center around the 5-speed gearbox conversion. Porsche 930 fans know that the standard gearbox, although robust, tends to have quite tall gears causing the car to fall off boost between shifts. RUF touts the 5-speed conversion as getting rid of this problem and details their conversion process.
Page 10: Details on the Carrera 260hp conversion kit. The power comes mostly from the 98mm pistons and cylinder, which boost displacement to 3.4 liters for the Carrera and 3.2 liters for the 911SC. These are the same Ps & Cs that are commonly referred to as “Max Moritz” Ps & Cs. There is also a 2-out muffler included with a rear valence that has dual cutouts. The only thing curiously odd is the right-rear valence on the right side of the picture, which I can’t see anything particularly different about than the Porsche unit.
Page 11: Details on the 17″ RUF wheel by Speedline are revealed and also plenty of touting the safety and performance of the Denloc tires by Dunlop. Runflat tires are no big deal these days and fitted to many cars from the factory, but back in the ’80s it was something exotic. RUF used the Denloc tires on the Yellowbird when running 211mph at the Road & Track shootout.
Page 12: CTR330 braking system is showcased. 1″ bigger rotors than the 930 brakes with bigger calipers and pads. At the end, there is mention of the larger calipers and pads for use on the standard 930 without the 1″ larger rotors. Presumably this is for owners who want to keep the factory fuchs wheels, but want improved braking performance.
Page 13: Two polyurethane valences are featured. One is the Kremer-style with the brake duct holes and the other, a RUF original design that retains foglights (not pictured). The shock absorbers with special valving for RUF are also showcased. The swaybars are shown in the photo, but no mention is made in the description.
Page 14 & 15: A list of available tuning parts with some pictures. Love that Porsche 3-spoke steering wheel with the leather-covered horn pad with RUF logo embossed in the center. I wonder how much those aluminum fenders and hood are if they’re even still available.
Page 16 & 17: Showcasing the Yellowbird with mention of the Road & Track article that made it famous (or is that infamous?). A production run of 10 cars per year is alluded to, and we know now that total production wrapped at 29 cars built from bodies-in-white. A 0-60 time of 4 seconds and 1/4 mile in 11.7 @ 133.5 mph is still totally respectable even by today’s standards. 211 mph does not seem that high with Mclaren F1s and Bugatti Veyrons clear into the 250 range, but compared to other sports cars in the sub-500 horsepower range it is still among the very best.