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willtel willtel is offline
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Join Date: Feb 2008
Location: Marietta GA
Posts: 2,575
I ran across some info here, 1985 RUF BTR (Porsche 911 Turbo)

Originally Posted by Karl Ludvisgren
For the 1983 season Porsche built six 930’s expressly built for racing. Suspension was stiffened with torsion bars up 3mm in diameter to 22mm in front, and 1.5mm at the rear to 27.5mm. Front Anti Roll bars were a thicker 22mm while their rear bars were made adjustable for stiffness. The 930’s 917 brakes were good enough to start with, but Porsche was able to make larger 330mm brakes available for 1983. These fitted inside 16” wheels with 9.5” front rims and 11” rear. Constructed much along the lines of the 934, the Group B 930 had an aluminium roll cage and an aluminium cross brace above its 26.5 gallon racing fuel tank and an oil tank in the front compartment.

Working within Group B rules, the engine was given cam timing with more overlap, a larger intercooler and boost pressure raised to 20psi (1.4bar). Output rose to 364hp@5,500rpm and torque increased substantially to 360 ft/lbs @ 4,500. To cope with the higher cylinder head pressures, 935-type head gaskets were installed. Completing the drivetrain was a clutch with sintered metal linings and a gearbox equipped with an oil pump and cooler.

What would Porsche’s customers do with a car like this? Why take it to Le Mans, of course! It was a tribute to their confidence in the provisions that Porsche had made in these vehicles that their owners felt they could be subjected to more than 24 hours of flat out speed at Le mans. As a matter of fact, they could. Of the six cars entered in 1983, one retired and two finished well back. The other three were first, second and third in Group B and 11th, 13th and 15th overall. At scrutineering they weighed in at and above the 2,723-pound minimum for their engine size, to which they had to be ballasted by some 200 lbs of lead in the passenger foot well.....It’s 0-60mph acceleration took 4.5 seconds and it reached 100 from rest in one-fifth less than 10 seconds.
1987 GP White 930
1977 Ford Bronco
Old 07-17-2010, 07:21 PM
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