1974 RS or RSR?

[mcvgums]

Hey guys, this is my first question for the group. I just bought an 83 SC body with a 3.0L refurbished engine. My intention was to make a 74 IROC replica with it. I have scoured the threads to see some beautiful projects. I just can't find the difference between the RS and the RSR for 74. What are some of my options other than the IROC replica, and do any of them incorperate a duck bill spoiler and remain correct? I plan to document my project on this site and thank you in advance for your responces and pictures!!

[dd74]

I don't think there was an RS for 1974. There was a Carrera and an RSR. The Euro Carrera differed from the U.S. version as the Euro had a mechanically-injected 2.7, while the U.S. received a CIS-equipped engine. Otherwise, except for maybe collapsible bumper tubes, the Carreras were similar.

Now an RSR (or Carrera RSR) was a race-prepped Porsche for IROC racing. There were and continue to be very few available. They used a mechanically-injected 3.0, had much wider arches, wheels and tires, and are very appreciated among Porsche fans.

[ERH]

"911 & Porsche World" for January 2007 has a 74 3.0 Carrera RS on the cover.

It is valued at 200,000 GBP ..... beautiful car

[Rich76_911s]

Out of Bruce Andersons book "Porsche 911 Performance Handbook." on Page 15:

This is an abbreviated version:

"The 1974 3.0 Carrera RS was an even more exciting model than its predecesor, the 1973 2.7 Carrera RS. Only 100 1974 Carrera RS's were required for 1974 homolgation, and actually 109 were built. Of the 109, 44 were street version, 15 for IROC, and the remaining 50 for factory and customer race cars. The resulting competition car was the now familiar 3.0 RSR. The 3.0 RSR was the first 911-based car built from scratch as a race car, and some 65 were produced.

The 3.0 Carerra RS was still a mechanically injected car with 230 hp. Because Porsche was sure that most of these cars would converted to race cars, all were delivered with 917 brakes and an oil pump with an external loop cooler for the transmission. They also had a special shortened trailing arm with revised pickup points, 8 inch wide front wheels and 9 inch wide rear wheels."

So essentially the 44 road going 1974 3.0 Carrera's were RS's and the 65 race cars built were RSR's. Of the 65, 15 were for the IROC series.

Oh and for what it is worth. I am about 99.9% sure that the IROC racing series cars were originally shipped with the duck-tail rear spoiler, but it was changed out for the IROC tail.

[TRE Cup]

My brother and I owned chassis 022 RS 3.0. We imported it from France , where it had experienced a hard life in hillclimb competition. We did a mild restoration of the car , including the full rebuild of the mechanicals. We had some fun with it in POC events before (sellers remorse!) seeing it go to a east coast collector
The RS 3.0 was originally delivered with low butterfly street injection on the same block/ crank /heads that the RSR was using. Our's came with the early RSR high butterfly and twin plug heads/distributor. As its been discussed elsewhere on this board, the flares were similar but not the same dimensions or shape as the later 930. The front flares were actually crudely made. The IROC RSRs had the same width bodywork and flares as the RS 3.0.

The IROC cars did indeed come initially with ducktails ( I think ours did too- as that was the only spoiler we had seen the car compete with- we installed a IROC tail real quick). That has been documented in several pics- one of them in Excellence was Expected of the cars on a transporter. The whaletails were installed here in the states.

RSR's had wider bodywork with wider wheels and eventually centerlock fastening. The motors were 3 liters in all the models, but the RSR ended up with the slide valve mechanical injection- good for 335 hp

In your choice of building the car, the RSR has the most visual impact. The huge 13-15 inch rear flares ("narrow" and wide RSR versions) and 11 inch front vented fenders will require some serious wheels and rubber to fill them. The rest of the body is essentially the same as the RS 3.0 (930 turbo) width version

the white car pictured here is a IROC style RSR, whereas the green car is the full on RSR

[Chuck Moreland]

Dave, more details on the green tail please.

It appears to be an IROC type, but with rubber lip. I haven't seen that before. Were did that come from?

[TRE Cup]

aha! you noticed the european market approved whaletail that was delivered on the RSRs. As the cars were homologated, they had to be street legal with pedestrian impact protection from those huge wings. The total overall dimension is identical to the iroc/ RSR fiberglass whaletails. The rubber is considerably larger than the 75-77 turbo and the fiberglass was longer as well.

Guess who just happens to have one ?

[cfc]

try reading a book.

[skinnerd]

I vote for RSR.....

[mcvgums]

Thanks for the clarification guys, I have ordered the RSR body from GT Rasing and I am trying to get hold of Mike Lindsey for some 9 and 11 in. Fuchs. I am going to put the solid color iroc tail and "Carrera" down the side in stead of "Porsche".

I will keep you up to date as to the progress, thank you for all your help so far!

Mark