1970 Porsche 911 2.3 ST Group IV Special GT
Seller's description
We proudly present an extremely rare Porsche 911 ST racing car in the even rarer “Group IV Special GT“- version, from the first series. Between 1970 and 1971 ca. 20 cars were converted according to specification/usage and classification (circuit, rally, series GT group 3 or special GT group 4) by the Porsche racing department in factory 1 and either prepared for factory team racing or delivered to racing sport customers. Only ten cars in 911 racing circuit version “Group IV Special GT“ were built. Porsche used the factory-made 911 ST versions as basis for the conversion. The 911 ST was a sports version of the serial made 911 S 2.2 liter, made lighter in two stages of development.
The 911 ST with sports equipment differed from the serial type 911 S 2.2l in the following points:
- Lighter body, consisting of, among others:
- Omission of underbody protection and sound insulation mats
- Omission of bumper bar guard front and rear
- Simplified interior: door panels, door lock, carpet dash panel
- Rubber quick fastener for front and rear lids
- Sports version consisting of, among others:
- Locking differential
- Anchoring supports for sports safety belts
- Reinforced in left/right for roll-over bar fixation
- Rev counter up to 10,000 rpm
- Leather sports wheel 380mm diameter
- 62 liter fuel tank with large filler plug under the hood
In addition to the sports make, the 911 ST racing version features following modifications:
- Serial chassis lowered in front and rear
- Adjustable anti-roll bars in front and rear
- Plastic front fenders widened
- Aluminum doors with 0.75 mm steel core
- Widened steel fenders in rear
- Plastic front and rear bumper
- Plastic front hood
- Plexiglass screens at sides and in rear, laminated safety glass windshield
- Stabilizer bar between front fenders and front hood
- Engine:
- Light alloy cylinder with larger 85 mm drill hole, 2,247 cc and racing piston
- Carrera 6 racing camshaft, rigid rocker arm
- Cylinder heads with precision in- and outlet duct and larger valves
- Weber carburetor system 46 IDA with special intake manifold
- Racing exhaust system
- Sports clutch
- Transistor double ignition
- Output: ca. 230 DIN hp at 8000 rpm/ max. torque: 230 NM at 6000 rpm
According to accompanying Porsche certificates, this car offered here was delivered through MAHAG/Munich on 01. March, 1970 with the following features in the original color blood orange:
- ST sports equipment M491
- Locking differential with locking factor 80 M220
- Roll-over bar M420
Immediately after delivery and before approval for road service, the first owner, Mr Hans Braun from Nuremberg, had the car modified to “Group IV Special GT“ by the Porsche racing department at factory 1 and equipped with following features:
- 230 hp racing engine 2.3 l (911/22) with Weber carburetor 46 IDA
- Widened plastic fenders and bumper bar in front
- Widened fenders in rear
- Plexiglass screens
- Multi-part transmission ratio
- 110 liter fuel tank
- 7‘‘ and 9‘‘ racing wheel rims
With this specification, the 911 ST group IV special GT with a curb weight of only 930 kg reached a power/weight ratio of only 4.04kg/hp (in comparison: Porsche 911 2.7 RS 1973: 5.1kg/hp; Porsche 911/991 Carrera 2014: 4.94 kg/hp), remarkable even for today's standards. The extra price for the “normal“ 911 ST sports equipment M471 was DM 1.250 back then. Accordingly, a 911 ST in sports equipment had a catalog price of DM 31,230. According to its first owner, the vehicle offered here had a price of ca. DM 50,000 in 1970. The price also shows the difference between the 911 ST models from serial production and the models of the group IV special GT, modified by the racing department.
The 911 ST special GT was first registered in the name of Mr Hans Braun on 28 April, 1970. Hans Braun made his first circuit race (DRM) with this car on 03 May, 1970 on the airfield in Kaufbeuren. With the starting number 171 he reached a remarkable 5th place in the class “GT cars above 2,000 cc“. The car's first use in racing is documented with the original registration for the race, the race's program and the race's official result.
Following race entries are also specified:
- 24 May, 1970, Wasgau-Bergprüfung, 1st place GT above 2000 cc
- 31 May, 1970, Jura-Bergrennen, Neumarkt, 1st place GT above 2000 cc
- 14 June, 1970, Flugplatzrennen Neuhausen, 2nd place GT above 2000 cc
- 25 April, 1971, Krähberg-Rennen (Dt. Bergmeisterschaft), 2nd place GT above 2000 cc
- 02 May, 1971, Frankenwald-Bergrennen, 1st place GT above 2000 cc
- 16 May, 1971, Eurohill-Bergrennen, Obermössing, 2nd place GT above 2000 cc
- 11 July, 1971, Norisring “200 Meilen von Nürnberg“, 10th place GT above 2000 cc
- 26 September, 1971, Ansbacher Bergrennen, Spalt, 2nd place GT above 2000 cc
- 26 March, 1972, Bergpreis Zotzenbach, no result
In April 1972 Mr Braun sold the Porsche 911 ST to its second owner Ludwig Hornauer, who participated in the following race events until 1974:
- 30 July, 1972, Ellerberg-Rennen, Bamberg, 4th place GT above 1600 cc
- 08 October, 1972, Automobil-Slalom Bamberg, 8th place GT cars
- 11 March, 1973, Scheßlitzer Automobil-Slalom, 5th place GT cars
- 22 April 1973, Frankenwald-Bergrennen, 4th place GT above 1600 cc
- 12 May, 1974, Automobilslalom Stadt Bayreuth, 5th place GT cars
- 21 July, 1974, Ellerberg-Rennen, Bamberg, 4th place GT above 1600 cc
- 15 September, 1974, Slalom Giebelstadt, 2nd place GT above 1600 cc
Ludwig Hornauer sold the 911 ST to Manfred Grundmann, Gochsheim/Schweinfurt in 1975. Over the following years, ownership changed several times before the car was eventually sold to California in 1992, where it participated in several vintage car racing events, e. g. Moroso, Daytona (racing sports reunion). It was then sold to its current owner in Germany. The 911 ST underwent thorough restoration between 2005 and 2009. The aim was to restore its original condition upon delivery in 1970, by making maximum efforts to preserve the original substance. For this purpose images from the Porsche archive were used. The original engine was not at hand, which is why the engine was rebuilt using the correct engine number (no matching number). However, the rebuilt engine with pinned crankcase, 2.3l 911/22, 46 IDA Weber carburetors, double ignition, Carrera 6 camshafts, Mahle 85x66 mm pistons and cylinders and sports exhaust is in line with the delivery status. The gearbox is likewise not the original part, a similar 5 gear manual racing transmission type 901/54 with strengthened case and main shaft for the exchange of all gear trains, additional exterior oil spray-cooling and pump with Nürburgring transmission was built in. With regard to usage in vintage car racing, homologation stipulations 1970/1971 according to homologation sheet 3025, as well as the currently valid and binding homologation stipulations were observed in the restoration. The vehicle has valid FIA papers, safety measures (cage, fire extinguishing system) are FIA-certified. The restoration has been comprehensively documented by pictures and is proven by invoices. In addition to the Porsche birth certificate, the car's documentation comprises a paper regarding the conversion by the factory to group IV, a confirmation by the sports coordinator Jürgen Barth, the original entry for the first race with VIN and engine number, the program and the race's original result, a sales ad in AMS by Hans Braun, the purchase confirmation by the 2nd owner Ludwig Hornauer and the replacement vehicle registration from 1978.
This car is insured through Auctionata AG and its insurance partner BELMOT for up to six weeks after the auction with a convenient all risks insurance that covers cases such as engine and/or transmission failure or accidental damages. This specific insurance cover is valid for Germany, Austria and Switzerland and may be continued by the buyer after the insurance period has expired at special conditions. The BELMOT all risks insurance excludes: a) indirect and direct damages due to the normal aging process (especially rust, corrosion, oxidation) or natural wear and tear, i. e. due to a natural wear during the drive mode, on car parts which have to be replaced repeatedly during the lifetime of the vehicle; b) indirect and direct damages based on thermal problems, especially due to high temperatures, insufficient cooling while driving or overheating.
The vehicle has to be paid within 3 days after the auction and collected within 7 business days after receipt of payment. The collection may be made via collection by the costumer or via collection by a transport company. A timely collection can also made via a commissioning of Auctionata to a fee-based transport (flat shipping rate). If the time period lapses without a result, the buyer has to pay storage costs in the amount of 25, - € per day.
General notification: According to A. 1.2 in our general terms and conditions cars auctioned by Auctionata are goods on consignment which Auctionata has been provided with by consignors. Auctionata does not assume liability for hidden defects that have not been ascertained in the course of assessment. This liability exclusion is not effective in case of gross negligence and intention on the part of Auctionata.
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