911 ST project

[993TT]

I have a 1970 T-model coupe, which I and my mechanic are very eager to start building as a ST replica. Body has e.g. new floors and is pretty much structurally sound, interior will be used for another project. Been "updated" a while ago, so fenders, bumpers, hood, etc. will be replaced anyway. So, I have a few questions for your consideration:

Which would be the best place to look for fender flares (metal) or complete fenders (glassfibre)? Because of shipping, VAT, customs,.... I would very much prefer an European location.

I have an "RS-spec" engine, which could be used for this project. How do you feel about it? Would it be enough, or should I start looking for 46 Webers, 906 cams, pistons, cylinders,.... When finished, car would be mostly used on the road with very limited track-day use (possibly some historic events on track and gravel). Any other good options in mind?

We are currently in the planning process, so any ideas, comments or points to be considered are most wellcome and appreciated.

Many thanks in advance,

[RSTarga]

Best ST build I've seen.
http://www.early911sregistry.org/for...ighlight=olive

[KennethClay]

I'm slowly working on one of those as well. Regarding parts, I've just scoured the forums and worked with some of the high quality shops to source parts. I ended up going with steel flares and bumpers, though the hood and rear deck are balsa-reinforced fiberglass.

As for the engine, I went a bit bigger than the engine used by Flunder (who is a friend and created an amazingly accurate ST). I'm really building more of a hot rod. As such, my car will have a 964 engine, bumped out to a 3.8l with racing P's and C's. It also has 50mm PMOs and a twin plug distributor. The transmission is a G50 with a shortened bellhouse.

You're going to have great fun with the build and the car--please post pictures along the way!

[Jeager]

Hello,

we are also considering the build of a 911 ST based on a 1970 chassis.
From our side we plan to follow the FIA regulation in order to get the "PTH" (French racing agreement) to have the car used at the 'Tour de Corse' rally.
this means we need to conform the the FIA appendix K/J and the FIA 3025 homologation making as much as possible a "real" werk clone but also getting the best 'legal' and competitive car.
Since I'm thinking of this build I understood that we mainly can identify 2 type of ST: the pre 72 and the post 72 or the 2.3 and the 2.5L (but it's more complicated than that).
The main reason is to comply from January 1972 with the evolution of the appendix K/J: this says that we must follow the production spirit for exterior body panel, and windows unless 500 cars were made in period:
to sum-up from 1972 you must use front steel fender, front and rear steel bumbers, doors, glass wintows... because no production cars was fitted with plastics ones.

I have identified the following different configuration:

Chassis 911 ST Pre 1972 group 4 (env 840kg):
ELEMENTS: DESCRIPTION
Rear wings: Steel with welded extension up to 1680mm
Front wings: Plastic up to 1680mm (idem 2.8 RSR)
Front bumper: Plastic
Rear bumper: Plastic
Front hood: Plastic
Rear deck lid: Aluminum
Doors : Steel with exterior panel in aluminum
Windshield: Standard
Doors windows: Plexiglass
Rear lateral windows : Plexiglass
Rear window: Plexiglass
Gearbox : 911 5 speed with oil pump and cooling radiator
Engine : 911/20 or 911/22 or 911/21
Brakes : Standards 2.2S (front S aluminum; rear in cast iron
Oil cooling: Standard radiator in the front right wing,
2 radiators in the front wings (L and R similar as the 911R) for cars using injection engine 911/20 et 911/21
Battery box: No change

 
Chassis 911 ST Post 1972 Groupe 4 (env 920kg):
ELEMENTS : DESCRIPTION
Rear wings: Steel with welded extensions up to 1680mm
Front wings: Steel with welded extensions up to 1680mm (idem 2.8 RSR)
Front bumper: Steel with plastic extensions
Rear bumper: 3 parts, steel (extensions ??), central part in aluminum (911S ?)
Front hood: Steel
Rear deck lid: Aluminum
Doors : Steel with exterior panel in aluminum (I need to confirm the aluminum exterior panel because it has probably not been fitted on more than 500 cars…)
Windshield: Standard
Doors windows: Standard
Rear lateral windows : Standard
Rear window: Standard
Gearbox : 915 5 speed with oil pump and cooling radiator
Engine : 911/70 (911/ 71 depend on sources) or 911/73
Brakes : Front and rear 917 calipers
Oil cooling: 2 radiators in the front wings (L and R similar as the 911R)
Battery box: Deleted for cooling purpose

 
911 ST Group 5 (env 790kg - Larrousse):
ELEMENTS: DESCRIPTION
Rear wings: Steel with welded extensions up to 1680mm
Front wings: Plastic up to 1680mm (idem 2.8 RSR)
Front bumper: Plastic
Rear bumper: Plastic
Front hood: Plastic
Rear deck lid: Plastic (like the 911R) (deviation from the 2.3 group 4)
Doors : Plastic idem 911R (deviation from the 2.3 group 4)
Windshield: Standard
Doors windows: Plexiglass
Rear lateral windows : Plexiglass
Rear window: Plexiglass
Gearbox : 915 5 speed with oil pump and cooling radiator (deviation from the 2.3 group 4)
Engine : 911/73 up to Class limit 2500cc
Brakes : Front and rear 917 calipers (deviation from the 2.3 group 4)
Oil cooling: 2 radiators in the front wings (L and R similar as the 911R)
Battery box: Deleted for cooling purpose(deviation from the 2.3 group 4)

 
Engine Pre-72

Type 911/20 (engine end of season 1970) 230hp
ELEMENTS: DESCRIPTION
Fuel system: Injection High Butterfly diam 41.5
Piston diameter: 85mm
crankshaft: 66mm
Engine capacity (real) : 2247Cc
Cylinder head: I46E40 I38E38

Type 911/21 (Engine 1971) 250cv
ELEMENTS: DESCRIPTION
Fuel system: Injection High Butterfly diam 41.5
Piston diameter: 87.5mm
crankshaft : 66mm
Engine capacity (real): 2380Cc
Cylinder head: I46E40 I38E38

Type 911/22 (Engine beginning of 1970 season) 230hp
ELEMENTS DESCRIPTION
Fuel system: Carburateur weber 46IDA
Piston diameter: 85mm
crankshaft : 66mm
Engine capacity (real): 2247Cc
Cylinder head : I46E40 I38E38

 
Engine post 1972:

Type 911/70 (engine 1972) 275 hp
ELEMENTS : DESCRIPTION
Fuel system : Injection High Butterfly diam 41.5
Piston diameter: 86.7mm
crankshaft: 70.4mm
Engine capacity (real): 2492Cc
Cylinder head : I46E40 I41E41

Type 911/73 (Rally engine 1972) 275hp
ELEMENTS: DESCRIPTION
Fuel system: Injection High Butterfly diam 41.5
Piston diameter: 89mm
crankshaft : 66mm
Engine capacity (real): 2464Cc
Cylinder head: I46E40 I41E41

Sorry for the bad presentation and translation issues, I use to make this as a table in French...
If you send me your email address I can send you the FIA 3025.

cheers

[majordad]

Hello from Ireland ! I too am considering an ST Replica from my 2.4 S shell which I used race. Could you email me the FIA 30125 as well please
( whelanporsche@eircom.net)

[jdj123]

Hello from Bordeaux,
Could you Please send me the FIA 3025 :
jean-dominique.julia@wanadoo.fr
Thank you.
Cheers

[merbesfield]

That is a great comparison list. Not to steer this away from ST's, but would anyone have a similar list showing the RSR specs?

[72Group4]

I wasn't aware that the 917 brakes were homologated on the 1972 Group 4 cars. Can someone please confirm this?

[Jeager]

Adenda 8/6V of FIA 3025.

[72Group4]

Thank you.