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911 Carrera RSR 2.8 (M491)

911 Carrera RSR 2.8 (M491)

1973Coupé

The race car the whole Carrera RS existed to legitimise: with production of the RS above 500 units, the 911 qualified for FIA Group 4 Special GT, and 55 of the 1,580 RS cars were converted under code M491 into RSR 2.8 competition machines. They carried wider front and rear arches, wheels and tyres than the road RS, and the 2,808 cc engine with 92 mm bores — about 48 PS more than the road car's 2.7. Peter Gregg took one to a class win at Daytona in 1973, the season the RSR was homologated. It is the last factory race derivative built before the F-body ended and the impact-bumper G-series began.

SpecificationsSound: Porsche 911 R (1967)Edvvc · CC BY-SA 3.0 · Commons (opens in a new tab)

Unofficial fan showcase · media licensed per asset

Specification plate

Numbers as published

Every figure below is quoted from the sources listed at the foot of the page. A dash means the number was never published — it is never estimated.

Engine

2,808 cc

air-cooled flat-six, Typ 911/72, 92 mm bore × 70.4 mm stroke

Power

312 PS

0–100 km/h

—

Not published: Race weight, torque and gearing figures — not published

Top speed

—

Not published: Confirmation of the exact model year (1973) at which the RSR 2.8 ran, as homologation straddled the 1973/74 season

Weight

—

Not published in the source data

Drivetrain

Rear-engine, rear-wheel drive

Transmission

5-speed manual

Production

55 of

the 1,580 Carrera RS cars were converted to RSR 2.8 under M491 (Wikipedia)

Body styles

Coupé

3D viewer

Look closer

Parallax pan of one photograph · no multi-angle 360° exists under a free licence

Looking for the frame sequence

Turntable sequence from frame 0
Paint

A turntable is a photograph sequence, so there is no material to tint.

Wheels
StockSportTurbo

No 3D model on file for this variant yet.

Gallery

5 views of the Carrera RSR 2.8 (M491)

Click a frame · Esc closes · ←/→ move

Watch

3 films on the Carrera RSR 2.8 (M491)

Variant-specific films first, then the curated set for the generation. Every player is an embed that loads on click.

  • Generation · The Wheel Network

    Porsche Historic Footage – Porsche 911 Prototype and Premiere at the 1963 Frankfurt Motor Show

    archival footage of the 901 Frankfurt debut that created the 911

  • Generation · 9WERKS TV

    Porsche 901 prototype: the second-oldest surviving 911 of all time!

    factory-original 901 prototype, the car Peugeot nearly stopped

  • Generation · Petrolicious

    This 1968 Porsche 911L Was Just A Dream

    series-two longhood 911L, the best of the very early 911s

Compare

Set it against its neighbours

911 Carrera RS 2.71972–1973Same body, same era911 2.41972–1973Same body, same era911 S 2.41972–1973Same body, same era
Compact specification comparison between the 911 Carrera RSR 2.8 (M491) and 911 Carrera RS 2.7, 911 2.4, 911 S 2.4
Spec911 Carrera RSR 2.8 (M491)1973911 Carrera RS 2.71972–1973911 2.41972–1973911 S 2.41972–1973
Years19731972–19731972–19731972–1973
Engine2,808 cc air-cooled flat-six, Typ 911/72, 92 mm bore × 70.4 mm stroke2,687 cc (2.7 L) air-cooled twin-ignition flat-six, Typ 911/83, 90 mm bore × 70.4 mm stroke, NIKASIL-coated bores, Bosch mechanical fuel injection2,341 cc air-cooled flat-six, 84 mm bore × 70.4 mm stroke — the stroke, not the capacity, grew from the 2.22,341 cc air-cooled flat-six, Typ 911/53 with Bosch mechanical fuel injection, 8.5:1
Power312 PS210 PS190 PS190 PS
0–100 km/h—0–97 km/h (0–60 mph) 5.2 s Touring / 5.5 s Lightweight (stuttcars performance data); Porsche published no 0–100 km/h figure—0–97 km/h (0–60 mph) 6.5–7.8 s depending on body (stuttcars); no official 0–100 km/h figure
Top speed—240 km/h≈204–232 km/h (127–144 mph) depending on version≈232 km/h (144 mph)
Weight—1,075 kg1,050 kg1,050 kg
Drivetrain — identical across all carsRear-engine, rear-wheel driveRear-engine, rear-wheel driveRear-engine, rear-wheel driveRear-engine, rear-wheel drive
Transmission5-speed manual5-speed manual (Type 915)5-speed manual (new Type 915) or 4-speed Sportomatic5-speed manual (Type 915) or 4-speed Sportomatic
Body stylesCoupéCoupéCoupé · TargaCoupé · Targa
Production55 of the 1,580 Carrera RS cars were converted to RSR 2.8 under M491 (Wikipedia)1,580 total per Porsche Newsroom and Wikipedia (1,308 Touring M472, 200 Sport lightweight M471, 55 RSR, 17 homologation base cars); two secondary compilations quote 1,590—1,430 coupés and 788 Targas (stuttcars)
Open the full comparison

Pairs load as /compare?a=901/carrera-rsr-2.8&b=901/carrera-rs-2.7

Sources (3)

  1. Porsche 911 (classic) — Wikipedia (Carrera RS 2.7 & RSR 2.8) (opens in a new tab)
  2. Porsche 911 Carrera RSR 2.8 (1973) — Stuttcars (opens in a new tab)
  3. A brief history of the Porsche 911 — porsche.com (opens in a new tab)

What the sources do not settle (2)

  • Race weight, torque and gearing figures — not published
  • Confirmation of the exact model year (1973) at which the RSR 2.8 ran, as homologation straddled the 1973/74 season

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