911 sc rs 3rd pipe
10-17-2007, 04:39 PM
#1
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911 sc rs 3rd pipe
Hi
I have in front of me last issue of Porsche World.
There is article about 82 911 sc rs code 954. This car has 3 pipes. 2 regular + one small. Could someone describe purpose of this small pipe?.
I heard that there is for special pump but it is unclear for me
thanks in advance
I have in front of me last issue of Porsche World.
There is article about 82 911 sc rs code 954. This car has 3 pipes. 2 regular + one small. Could someone describe purpose of this small pipe?.
I heard that there is for special pump but it is unclear for me
thanks in advance
10-17-2007, 04:43 PM
#2
RL Technical Advisor
Marcin:
I've worked on these cars; can you be more specific about precisely what you are referring to????
I do not have that magazine on hand but I am familiar with the 911SC/RS.
I've worked on these cars; can you be more specific about precisely what you are referring to????
I do not have that magazine on hand but I am familiar with the 911SC/RS.
10-17-2007, 05:42 PM
#3
Steve, I'm pretty sure he's talking about the exhaust.
Because of the rally-car nature of the SC/RS, the exhausts were modified to run a less restricted path through the muffler and exit via two pipes coming straight out the back during racing. When the cars needed to be driven between stages through small towns and cities, the two rear pipes were capped off and the exhaust would divert through the entire muffler and come out of a tip in a similar location to a stock street 911SC. This would quiet the cars down a good amount.
Because of the rally-car nature of the SC/RS, the exhausts were modified to run a less restricted path through the muffler and exit via two pipes coming straight out the back during racing. When the cars needed to be driven between stages through small towns and cities, the two rear pipes were capped off and the exhaust would divert through the entire muffler and come out of a tip in a similar location to a stock street 911SC. This would quiet the cars down a good amount.
10-17-2007, 06:29 PM
#4
Rennlist Member
Not sure about what you saw, but the SC RS is one of the rarest 911s ever built. Only 20 were made, to satisfy homologation requirements for a race version of a discontinued (SC) model. The car that you're seeing was actually built is '83, and some literature suggests that all 20 were sold in '84 (not sure exactly what model year they were). 3.0 liter (actually just a wee tad under at 70.4mm stroke x 95mm bore), mechanical injection, 250 hp (street version), high lift cams, over 10:1 compression, and only 2100 pounds. It's rumored that at least five of the 20 made it into the states, and Rothmans bought a few to use as rally cars. At the time the car was thought to be the fastest street car ever built, recording sub 5-second 0-60 times. Yeehaw! Turbo (930) brakes stop the car, which is fitted with many body parts made from aluminum, thin construction windows, and fiberglas bumpers. Oh, to have one of those in the garage!
10-17-2007, 07:36 PM
#6
Drifting
953 was the rally version no?
i'd tend to agree with zamir about the pipes. i know a guy here with a 75 carrera with the same setup
there are some great vids on youtube with the 953 and especially the SC/RS...sounds evil!
i'd tend to agree with zamir about the pipes. i know a guy here with a 75 carrera with the same setup
there are some great vids on youtube with the 953 and especially the SC/RS...sounds evil!
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10-18-2007, 03:47 PM
#8
Rennlist Member
Sorry JV911, I'm not familiar with the "953" designation. I do know that the SC RS engine was designated as 930/18, and the 915/71 transmission used a road-speed trans oil cooler (that then appeared on RoW only '84> Carreras) along with LSD and an RSR clutch. The car's primary intent was to be a rally car, a two-wheel drive rally car, and it was very successful. Porsche then followed with a 4-wheel drive Carrera, and won the '84 Paris-Dakar with that car. In '85 Porsche entered again, using a Carrera fitted with 959 suspension, but had problems during the rally. In '86 Porsche entered the mighty 959 and finished the Paris-Dakar event 1st and 2nd.
Last edited by Peter Zimmermann; 10-18-2007 at 08:28 PM.
10-18-2007, 07:05 PM
#9
Drifting
hi pete 
yep i'm familiar with the SC RC...i've often lusted after one! i must have watched the same youtube vid of the RS over and over a hundread times
aparently the 953 was bult by the rothmans team for the Paris-Dakar Rally. only 3 were made. (i was thinking that rally SCs were designated 953 but i was off on that one, looks like it is actually the 4x4 carrera you refer to)
For the 1984 Paris-Dakar Rally, Porsche’s works-backed Rothmans team entered a trio of special four-wheel drive 911’s. Known as 953’s, they were developed in preparation for 1985 and ’86 when the German firm would be campaigning 959’s in the arduous 7500-mile event. The 953’s were suitably modified to cope with the demands of desert terrain, ground clearance being increased to 27cm with strengthened mounting points for the suspension, shock absorbers and engine. The suspension itself was via double wishbones at the front with two shock absorbers and a standard turbo set up at the back. There was also a fully lockable differential for the all-wheel drive system and standard 911 Carrera braking set up.
Engine-wise displacement was unchanged at 3164cc but with its reduced compression ratio (9.0:1), output dipped to 225bhp at 5800rpm. This slightly de-tuned but largely standard unit was developed primarily for longevity in the tough desert conditions. A normal five-speed gearbox benefited from an oil-cooler housed in the rear spoiler, the racing clutch receiving a sintered metal coating. Externally the steel doors, front lid and engine cover were replaced with composite panels whilst the side and back glass were plastic, the rear window itself being removable. A 10mm thick Kevlar panel was installed underneath and a steel cage welded in for rollover protection. Two separate fuel tanks were used, one in the front with a 120-litre capacity and a 150-litre unit behind the seats. To optimise weight distribution, fuel could be pumped from one tank to another. Additional mandatory equipment that had to be carried included two extra wheels, a hydraulic jack, an air-pressure compressor, special tools, ten litres of drinking water, signalling mirrors, a compass, survival blankets, turbans, signal rockets, smoke bombs, sleeping bags, a normal and emergency radio transmitter, a first-aid box including snake and scorpion serum plus a towing rope and shovel. All told, the 953 weighed in at 1210kg, was geared for a maximum speed of 113mph and could climb a 45° gradient. Three 953’s were entered for the 1984 Paris-Dakar Rally, Roland Kussmaul and Erich Lerner finishing 26th, Jacky Ickx and Claude Brasseur in sixth whilst Rene Metge and Dominic Lemoyne had a relatively trouble-free run to win the event outright some two hours and eighteen minutes ahead of the second place Range Rover.
yep i'm familiar with the SC RC...i've often lusted after one! i must have watched the same youtube vid of the RS over and over a hundread times
aparently the 953 was bult by the rothmans team for the Paris-Dakar Rally. only 3 were made. (i was thinking that rally SCs were designated 953 but i was off on that one, looks like it is actually the 4x4 carrera you refer to)
For the 1984 Paris-Dakar Rally, Porsche’s works-backed Rothmans team entered a trio of special four-wheel drive 911’s. Known as 953’s, they were developed in preparation for 1985 and ’86 when the German firm would be campaigning 959’s in the arduous 7500-mile event. The 953’s were suitably modified to cope with the demands of desert terrain, ground clearance being increased to 27cm with strengthened mounting points for the suspension, shock absorbers and engine. The suspension itself was via double wishbones at the front with two shock absorbers and a standard turbo set up at the back. There was also a fully lockable differential for the all-wheel drive system and standard 911 Carrera braking set up.
Engine-wise displacement was unchanged at 3164cc but with its reduced compression ratio (9.0:1), output dipped to 225bhp at 5800rpm. This slightly de-tuned but largely standard unit was developed primarily for longevity in the tough desert conditions. A normal five-speed gearbox benefited from an oil-cooler housed in the rear spoiler, the racing clutch receiving a sintered metal coating. Externally the steel doors, front lid and engine cover were replaced with composite panels whilst the side and back glass were plastic, the rear window itself being removable. A 10mm thick Kevlar panel was installed underneath and a steel cage welded in for rollover protection. Two separate fuel tanks were used, one in the front with a 120-litre capacity and a 150-litre unit behind the seats. To optimise weight distribution, fuel could be pumped from one tank to another. Additional mandatory equipment that had to be carried included two extra wheels, a hydraulic jack, an air-pressure compressor, special tools, ten litres of drinking water, signalling mirrors, a compass, survival blankets, turbans, signal rockets, smoke bombs, sleeping bags, a normal and emergency radio transmitter, a first-aid box including snake and scorpion serum plus a towing rope and shovel. All told, the 953 weighed in at 1210kg, was geared for a maximum speed of 113mph and could climb a 45° gradient. Three 953’s were entered for the 1984 Paris-Dakar Rally, Roland Kussmaul and Erich Lerner finishing 26th, Jacky Ickx and Claude Brasseur in sixth whilst Rene Metge and Dominic Lemoyne had a relatively trouble-free run to win the event outright some two hours and eighteen minutes ahead of the second place Range Rover.
10-18-2007, 07:35 PM
#10
Rennlist Member
JV911: Thanks for the great post! I particularly like the list of additional mandatory equipment, it sounds like they could have used a couple of AK-47s also!
10-24-2007, 01:30 AM
#13
Steve, I'm pretty sure he's talking about the exhaust.
Because of the rally-car nature of the SC/RS, the exhausts were modified to run a less restricted path through the muffler and exit via two pipes coming straight out the back during racing. When the cars needed to be driven between stages through small towns and cities, the two rear pipes were capped off and the exhaust would divert through the entire muffler and come out of a tip in a similar location to a stock street 911SC. This would quiet the cars down a good amount.
Because of the rally-car nature of the SC/RS, the exhausts were modified to run a less restricted path through the muffler and exit via two pipes coming straight out the back during racing. When the cars needed to be driven between stages through small towns and cities, the two rear pipes were capped off and the exhaust would divert through the entire muffler and come out of a tip in a similar location to a stock street 911SC. This would quiet the cars down a good amount.
10-24-2007, 11:30 AM
#15
Rennlist Member
Now we have one more issue to solve! I remember something about aluminum roll cages from that era, is it possible that the SC RS cage was aluminum rather than steel?