Costas

Hello everyone, this is my first post on rennlist.

Would anyone know the factory toe, camber, and caster settings of the 1974 Carrera RS 3.0? A friend just bought an FIA homologated replica and we are looking for a base setup to start with.

If it helps at all, I have a video with two close-ups of the car. This is from our visit to the track this Sunday. The car was OK on street tires but on slicks, at over 85mph, it would "wander" abruptly, making it difficult to keep a straight course. (I can't be more specific because I did not get to drive the car but my friend is a very accomplished driver and this is how he described the problem). It sounds to me like too much toe-out up front?

MUSSBERGER

Can't help you but it sure looks nice. Also liked the Capri. Post it on the racing forum. They may be able to help.

Costas

Thanks! I will try at the racing forum also.

That Capri is a monster :-).

pu911rsr

The tire and suspension technology is much different today than it was in 1974, I'd get it to a good race shop and have them corner balance the car, slicks tend to like a lot of negative camber and they are very sensitive to pressure.
Phil

rusnak

yup. We don't run bias ply anymore, and tend to want more neg camber.

Bill Verburg

The yellow car appears to be a '73 2.7RS

Costas

Bill, yes, it is not an original RS. It is, however, FIA homologated (i.e., it has all the approved parts to participate in races as a 911 RS). The engine is a 3.0 L producing about 250 bhp, so the closest classification for it would be a 74 RS 3.0L (which produced about 230 hp).

Bill Verburg

The suspension is quite different between a '73 RS and '74 3.0 RS

The '73 is a narrow body car w/ stock 911 components for the era. It would run narrower wheels and tires, a '74 3.0 RS is a widebody car running much wider wheels and tires and using 930 suspension/brakes.

He would be more interested in the n/b cars setups.

For street use more toe and less camber are usually used, for track just the opposite.

For my Carrera 3.0, mostly setup for street use, using the same suspension and a 2.7 RS except w/ aluminum trailing arms & 8 & 9.5x17 wheels, zero toe(pressed) w/ ~-1* camber in front and ~-1*30* in back works well, it's also ok for occasional track use on street radials

Costas

Bill, that is great info thanks! I will ask about the specifics you mention, to determine if we should be looking for a 73RS setup instead. The car is destined for track use, on slicks.

So, in your Carrera 3.0, you run zero toe in the back as well?

Bill Verburg

yes

Costas

Here is the car's background: Originally a 1973 911S 2.4L. Converted to 1973 RS specifications (with FIA class GT27 certification). The engine, however, is the 3.0L of the 1974 model.

So you are right, it is a 73 RS. The tires it runs on are Avon (not sure which compound). The rim sizes are 7.5/21.5/15 front and 8.7/21.5/15 or 8.5/23.5/15 in the back.

The previous owner was using this setup:

It is the front toe-in that seems excessive to me.

Bill Verburg

I agree, that all looks good except front toe, 0* pressed is the goal

not sure on your wheel data

my C3 came w/ 15" wheels 7ET23.3 & 8ET10.6. Over the years I've also used 8ET23.3 & 8ET25 in front and 9ET15 & 9.5ET19 in back. Tires everything from 205 to 235 in front and 225 to 275 in back

Costas

An update: Using the following setup, my friend took second place today at the 30th Palladio rally here in Greece :-). Tires where Khumo's 205 up front and 225 in the back.

It is quite interesting that in the last stage (by that time he had gotten used to his new car) he was 18th overall, with only Mitsubishi's, Subaru's, and other WRC modern cars in front of him.

Thank you all for your advice and suggestions!

MUSSBERGER

I know what that's like.

ADK

I would like to thank you all deeply, for your kind and prompt suggestions regarding my friend's Costas request. Your advises proved highly supportive during yesterday's rally-race.

For once more a sincere THANK YOU!