Photos: BMW M3 GTR

Racing | February 20th, 2009 by 6
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Unveiled last year at the Chicago Auto Show, the BMW M3 GTR is just that car that you would love to take it for a …

Unveiled last year at the Chicago Auto Show, the BMW M3 GTR is just that car that you would love to take it for a spin around the track. The M3 ALMS is the fourth-generation M3 Racing version competing in the American LeMans series and the team is led by Bobby Rahal who teamed up with David Letterman.

BMW manage to squeeze more power out of their 4.0L V8, from 414 to 485 horse power. The chassis of the M3 has been enhanced for the track, and weight has been reduced to make the fast M3 even faster. Of course, many other enhancements and weight saving technologies have been applied,  but we will let BMW tell us more about them.

Photos: BMW M3 GTR

The following photos are courtesy of Andrea at Axisofoversteer and the press release it was issued by BMWNA.

The BMW M3 Race Version: Sportiness personified.
In the course of developing the race version of the BMW M3, BMW’s engineers were faced with an ambitious task: to improve upon the sportiness of an already sporting car. A better base would, though, be difficult to find. In standard form the vehicle delivers powerful dynamics and sporting aesthetics. Thanks to an eight cylinder engine producing 414 bhp, BMW’s customers are provided with a unique driving experience.

Those engine blocks, cast in BMW’s light alloy foundry in Landshut – the very source of BMW’s Formula One castings – selected for race duty need to withstand even more power: the BMW P65 race engine delivers 485 bhp.

Photos: BMW M3 GTR

In order to enable the BMW M3 to make full use of this performance on the race circuit, the experts in Munich have not concentrated solely on the engine, but have race-tuned the chassis as well. The race version of the BMW M3 is wider and significantly lighter than its production equivalent, enabling it to perfectly transmit the power of its V8 to the track. Widespread use of carbon-reinforced plastic (CRP) provides proof of substantial weight reduction. As with the production version, the race car’s roof is manufactured from this high-tech material.

The race version of the BMW M3 is clearly aimed at the top echelon of motorsport. As such, it is no surprise to discover that in the course of its development, begun in mid-2007, numerous Formula One techniques were applied. These include computational fluid dynamics (CFD) and wind tunnel analyses, both of which have ensured the best possible aerodynamic package for the BMW M3.

Intelligent control systems have been incorporated throughout the BMW M3. The POWER400 control unit actuates all the accessories fitted to the car, such as lights, wipers, etc., via two bus systems. Traditional relays and fuses are thus eliminated, ensuring considerable weight saving, improved reliability and ease of application. The functions of the BMW P65 engine are managed by an ECU 408 electronic control unit, developed in-house by BMW Motorsport. The software and applications, too, have been developed by the experts in Munich.

Photos: BMW M3 GTR

Technical Specifications of the M3 Race Version.
Weight 2,535 lbs./1150 kg
Tank capacity: 29 gallons/110 Liters
Chassis/body: Unitary construction steel body with welded safety cell made of extremely rigid precision steel tubing; safety fuel tank in CRP sandwich tray; pneumatic four-stamp jack system
Aerodynamics: Front fenders, rear apron, hood, roof, trunk lid, rear wing, front wings, and flared rear wheel arches in CRP
Transmission: Carbon fiber clutch with hydraulic central slave cylinder;
6-speed sequential racing transmission with straight-cut, unsynchronized gears;
additional oil/air cooler; quick shift system with ignition cut-out controlled by shifting force; mechanical limited slip differential with additional oil/air cooler
Front axle: Based on production version, with increased wheel caster angle, enlarged track width and enhanced wheel camber; five-way adjustable shock absorbers; tubular stabilizer bar
Rear axle: Based on production version, with enlarged track width and enhanced wheel camber; five-way adjustable shock absorbers, tubular stabilizer bar
Front brake system: Six-piston aluminum brake calipers, inner-vented grey-cast iron brake disks 15.0 in./380mm in diameter
Rear brake system: Four-piston aluminum brake calipers, grey-cast iron brake disk, 13.1 in./332mm in diameter
Steering: Rack and pinion steering with electro-hydraulic power
Wheels: Aluminum wheels, 18 inches

BMW P65 Engine.
Type: Eight cylinder, V-configuration
Capacity: 3999 cc
Bore x stroke: 92 x 75.2 mm/3.62 x 2.96 in.
Max. output: approx. 485 bhp
Max. torque: approx. 368 lb-ft/500 Nm
Cylinder block: Aluminum cylinder block construction with bed plate lower section
Crankshaft: Steel crankshaft
Pistons: Forged skirt pistons
Conrods: High-performance steel
Cylinder head: Aluminum DOHC (Double Over Head Camshaft); four valves per cylinde
Valve train: Four overhead chain-driven camshafts, valve actuation via rocker arms
Intake system: Eight throttle valves, made of CRP with load-charge optimized ram tubes
Exhaust system: Headers, mufflers
Fuel system: Single cylinder multi-point injection
Lubrication: Dry sump lubrication
Cooling: Water/air cooler and oil/water heat exchanger

Electrics/Electronics.
Engine management: BMW Motorsport ECU 408 with two high-performance micro-processors; Individual cylinder injection and ignition; BMW Motorsport Lambda Controller; Pit speed limiter, Quick Shift function;
Engine data memory system
Energy management: Electric energy management and monitoring with BMW Motorsport POWER400 control unit, networking of all sensors and actuators through bus system
Wiring harness: Weight optimized
Ignition coil: Eight high-performance pencil coils with integrated ignition drivers
Spark plugs: High-performance spark plugs
Cockpit: Free programmable LCD Display with integrated shift indicators
Steering wheel: Quick release multi-function steering wheel w/ integrated display unit
Steering: Rack and pinion steering with electro-hydraulic power
Wheels: Aluminum wheels, 18 inches

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