550Spyder Posted 11July, 2020 Report Share Posted 11July, 2020 A great shot posted by Tomo has me scratching my head as to what they are. Aesthetically they look like 73 RSRs but doesn’t fit with any logic as they built 49 customer cars at random off the line from RS cars upgraded with m491 option upgrade. No logical reason race teams would be getting cars that presented like this in this range of colours and presentation as they would all be custom painted in team colours so would not have left factory in this fruit salad of colours. logically they should be 74 IROC cars on their way to an event, but aesthetically they have a 73 RSR ducktail and not the tea tray they raced with. Hard to believe that Porsche wouldn’t have fitted the tea trays before they went anywhere? Could these be ex Germany on their way to a US local mod at Porsche USA to get tea trays fitted for some sort of local marketing reason? With the exhaust pipes covered they look brand new. i am sure there is a historian out there that can put me straight? JV911 1 Quote Link to comment Share on other sites More sharing options...
LeeM Posted 11July, 2020 Report Share Posted 11July, 2020 Correct. They left the factory with ducktail, but were changed to the tea tray in the USA. I can't find any info as to why they did that, yet maybe more downforce was required? Raven 1 Quote Link to comment Share on other sites More sharing options...
Raven Posted 11July, 2020 Report Share Posted 11July, 2020 Quote Link to comment Share on other sites More sharing options...
Skidmarks Posted 11July, 2020 Report Share Posted 11July, 2020 4 hours ago, LeeM said: Correct. They left the factory with ducktail, but were changed to the tea tray in the USA. I can't find any info as to why they did that, yet maybe more downforce was required? They’re IROC cars. They were fitted with duck tails to make them “safety compliant” ex factory and then fitted with the 3.0 RS tails Raven, 550Spyder, LeeM and 1 other 4 Quote Link to comment Share on other sites More sharing options...
tomo Posted 11July, 2020 Report Share Posted 11July, 2020 9 hours ago, 550Spyder said: A great shot posted by Tomo has me scratching my head as to what they are. Aesthetically they look like 73 RSRs but doesn’t fit with any logic as they built 49 customer cars at random off the line from RS cars upgraded with m491 option upgrade. No logical reason race teams would be getting cars that presented like this in this range of colours and presentation as they would all be custom painted in team colours so would not have left factory in this fruit salad of colours. logically they should be 74 IROC cars on their way to an event, but aesthetically they have a 73 RSR ducktail and not the tea tray they raced with. Hard to believe that Porsche wouldn’t have fitted the tea trays before they went anywhere? Could these be ex Germany on their way to a US local mod at Porsche USA to get tea trays fitted for some sort of local marketing reason? With the exhaust pipes covered they look brand new. i am sure there is a historian out there that can put me straight? Story in next post Quote Link to comment Share on other sites More sharing options...
tomo Posted 11July, 2020 Report Share Posted 11July, 2020 Mark Donohue’s Daytona-winning IROC Porsche RSR emerges for sale 09 July 2020 Forty-six years ago, Mark Donohue of Can-Am fame fought off a selection of motorsport’s greatest champions all in identical Porsche 911 Carrera 3.0 RSRs to win the first International Race of Champions title at Daytona. Now, the very chassis in which he did it is for sale… In October of 1973, the American automotive magnate Roger Penske had 15 identical Porsche 911 Carrera 3.0 RSRs delivered directly from Zuffenhausen ahead of the inaugural International Race of Champions at Riverside in California. The series was devised to pit the finest drivers from a number of different disciplines against each other in identical cars at four events – three at Riverside and a ‘season’ finale at Daytona. All were televised over the winter of 1974–74, hence the Porsches’ vivid colours, designed to stand out on viewers’ new colour television sets. An extremely generous prize pot of 175,000 US dollars was also laid on, hence why the entry list was populated by a host of great names such as Emerson Fittipaldi, Denny Hulme, Richard Petty and Peter Revson. Despite this, it was the comparatively lesser-known Mark Donohue who became the first IROC champion after winning three of the four races. This impressive trio of victories included the curtain-closer at Daytona and netted him a princely 54,000 dollars. IIncredibly, the very car in which Donohue won at Daytona to secure his IROC crown has just emerged for sale in the Classic Driver Market with the renowned UK-based Porsche sports and competition car specialist Maxted-Page Ltd. Few people realise that the IROC RSRs from 1973 were built specifically for Roger Penske, Porsche’s motorsport wizards back in Weissach applying a raft of special racing features to each from the forthcoming 1974 model. These included the extended ‘whale-tail’ spoiler to replace the ‘ducktail’, flared wheelarches and bumpers to accommodate wider Fuchs wheels, and an updated 3.0-litre twin-ignition flat-six kicking out a punchy 315HP. After all, this was an effective marketing tool for Porsche – not just a free-for-all deathmatch on the racetrack. Donohue wasn’t the first to race this chassis, number 9114600042, which was painted bright orange. Roger McCluskey, Denny Hulme and A. J. Foyt each had a go at pedalling it in the qualifying races at Riverside, but it was the gifted former Team Penske engineer-cum-driver Mark Donohue who got the job done in the final at Daytona. Since then, this ultra-significant Porsche 911, a veritable slice of American motorsport lore, has been in the hands of just three long-term owners, has been both well maintained and beautifully preserved, and benefits from a full engine rebuild carried out by Porsche Centre Melbourne in 2014. For the more serious Porschephiles seeking an automatic entry ticket to the world’s most prestigious road, race and static events, you needn’t look much further. Harsh, Spectre and Troubleshooter 3 Quote Link to comment Share on other sites More sharing options...
550Spyder Posted 12July, 2020 Author Report Share Posted 12July, 2020 I have seen that Donahue car a few times before at Phillip Island. It is owned by the ( Nakas) brothers who acquired Duttons and seemingly have more money than god. They have the most amazing collection of historic race cars and from memory an ex F1 mechanic at their underground lair in Richmond who fettles them all. They have a group c 956 (Blauput) I recall and a McLaren Can Am car, maybe a M6d (correction M8F) i am not casting aspersions on the provenance of the car, but it strikes me as odd you would go to all the trouble of restoring it to period and miss the fact that the door/ window surrounds were chrome not painted. Quote Link to comment Share on other sites More sharing options...
tomo Posted 12July, 2020 Report Share Posted 12July, 2020 1 hour ago, 550Spyder said: I have seen that Donahue car a few times before at Phillip Island. It is owned by the brothers who acquired Duttons and seemingly have more money than god. They have the most amazing collection of historic race cars and from memory an ex F1 mechanic at their underground lair in Richmond who fettles them all. They have a group c 956 I recall and a McLaren Can Am car, maybe a M6d. i am not casting aspersions on the provenance of the car, but it strikes me as odd you would go to all the trouble of restoring it to period and miss the fact that the door/ window surrounds were chrome not painted. Summary Year of manufacture The cars on the carrier are black surrounds 1974 Car type Coupé Chassis number 9114600090 Competition car Yes Drive LHD Condition Used Interior colour Black Number of doors 2 Number of seats 2 Location Exterior colour Orange Gearbox Manual Performance 316 BHP / 321 PS / 236 kW Drivetrain 2wd Fuel type Petrol Description Chassis # 911 460 0090 1974 PORSCHE IROC CARRERA 3.0 RSR The ex-Mark Donohue - Daytona winner Price: £POA One of only fifteen cars specially built by Porsche in 1973 for the inaugural 1973-1974 IROC, International Race of Champions, series at Riverside, USA. A one-make televised race series conceived by Roger Penske, in which twelve championship title-winning drivers from the various top areas of motorsport, including Formula One, SCCA, Indycar and Nascar, competed together in identically prepared Porsche 3.0 IROC RSR’s for $175,000 total prize money - $43,000 going to the Daytona finale winner. Orange Chassis # 911 460 0090 – was first raced at Riverside in 1973 during the three elimination rounds, driven by Roger McCluskey, Denny Hulme and A.J Foyt. It was then one of just six cars to go through to the final held at Daytona - winning the race in the hands of Mark Donohue. IROC Series Races - Chassis # 911 460 0042 1973: 27/10: Riverside - Race 1: Roger McCluskey Car no. 12 Finished 8th 27/10: Riverside - Race 2: Denny Hulme Car no. 5 Finished 8th 28/10: Riverside - Race 3: A. J. Foyt Car no. 5 Finished 6th 1974: 14/02: Daytona – Finale Race: Mark Donohue Car no. 1 Finished 1st Whilst these cars visually resemble the road going 3.0 RS, they were assembled at the factory to (M491) RSR specification - IROC RSR (M491) – Specification Engine, Transmission & Suspension • 3.0-litre Mechanical Injection Type 911/74 RSR engine • 95 mm bore x 70.4 mm stroke, 10.3:1 compression • 316 hp @ 8,000 rpm / 310 Nm (229 lb-ft) @ 6,100 rpm • Six individual high-butterfly throttle bodies • Twin-plug ignition • 110-litre plastic fuel tank • 5-speed gearbox with oil pump • Limited-slip differential (80% lock) • Four-piston 917 brake calipers with cross-drilled discs • Dual master brake cylinders • Bilstein Shocks • 9J and 11J x 15 Fuchs alloy wheels • Goodyear radial racing tyres Bodywork • Steel front and rear RSR flared wheel arches • Welded chassis reinforcements • Rear shock tower reinforcements • Front fibreglass RSR bumper with centre oil cooler • Rear fibreglass RSR bumper • Fibreglass whale tail (with Daytona Gurney Flap) • Fibreglass front hood with balsa reinforcement • Plexiglass windows • Windshield clips and rear window straps • Rear blanking plate instead of Porsche reflector • Black headlight rings, cover and driver’s side door mirror Interior • Three-spoke Sport steering wheel • Lightweight Recaro racing seats • Lightweight door panels with release strap • Black headliner and needle felt carpets • No sound deadening • Clock and radio blanking plates • 10,000 rpm tachometer Safety • Rear roll hoop • Racing seat harness • Heinzmann fire extinguisher system After the 1973-74 IROC series, all sixteen cars were individually sold by Penske to privateer drivers and collectors and continue today to occupy a unique part of Porsche racing history. We are delighted to offer for sale this famous race-winning example, which has been authentically preserved and remains fitted with genuine type 911/74 IROC RSR engine, which was fully overhauled by Porsche Centre Melbourne in 2014 and used sparingly since. This immensely historic Porsche is offered for sale with all UK duties paid / or can be made available for immediate export. Quote Link to comment Share on other sites More sharing options...
Zelrik911 Posted 12July, 2020 Report Share Posted 12July, 2020 Any value in turning my Gruppe IB widebody into an IROC tribute, rather than a RS? I was at Le Mans when the 2 silver Martini livery 911 Carrera RSRs, were forced to compete against prototype Matras and such (Gijs van Lennep/Müller). Was an unfair fight but the road car 911's gave them a huge run for their money & came in 4th. My 911 rekindles that memory every time I start it up (and piss the wife & neighbours off - no end!) Quote Link to comment Share on other sites More sharing options...
Gavn Posted 12July, 2020 Report Share Posted 12July, 2020 Loving this thread. Subscribed. Quote Link to comment Share on other sites More sharing options...
TwoHeadsTas Posted 13July, 2020 Report Share Posted 13July, 2020 On 12/07/2020 at 10:42, 550Spyder said: I have seen that Donahue car a few times before at Phillip Island. It is owned by the brothers who acquired Duttons and seemingly have more money than god. They have the most amazing collection of historic race cars and from memory an ex F1 mechanic at their underground lair in Richmond who fettles them all. They have a group c 956 I recall and a McLaren Can Am car, maybe a M6d. i am not casting aspersions on the provenance of the car, but it strikes me as odd you would go to all the trouble of restoring it to period and miss the fact that the door/ window surrounds were chrome not painted. Our local Tassie motorsport mechanic David Ringsgwandl also spent some time with the Dutton Motorsport collection cars until recently, including the McLaren CanAm car. He was at Baskerville Historics with the car year before last, and told me that basically every chassis nut and bolt had to be retightened after every race!!! I think he also worked on the Donohue car. Quote Link to comment Share on other sites More sharing options...
550Spyder Posted 13July, 2020 Author Report Share Posted 13July, 2020 Would that make these the first short bonnet 911 cars in production? They clearly have different guards, bonnets and front ends on them, as well as different back ends to a (73 - 2.8l ) RSR. The IROC cars appear to have been produced mid 73, so I assume this is close to the first time the new short bonnet 911 with indicators in the bumper rather than in the guard had broken cover? And the first appearance of a “whale tail” rear spoiler? Quote Link to comment Share on other sites More sharing options...
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