Porsche 911 GT3
||This article is written like a personal reflection or opinion essay rather than an encyclopedic description of the subject. (December 2007)|
|Body style||2-door coupé|
|Wheelbase||92.7 in (2,355 mm)|
|Engine||3.6 L 360 hp (268 kW) H6, 3.6 L 380 hp (283 kW) H6|
|Length||174.6 in (4,435 mm)|
|Width||69.7 in (1,770 mm)|
|Height||50.2 in (1,275 mm)|
|Engine||3.6 L 415 hp (309 kW) H6, 3.8 L 435 hp (324 kW) H6, 4.0 L 500 hp (373 kW) H6|
|Length||174.3 in (4,427 mm)|
|Width||71.2 in (1,808 mm)|
|Height||50.4 in (1,280 mm)|
The Porsche 911 GT3 is a higher performance version of the Porsche 911 sports car. It is the latest in a line of high-performance models, beginning with the 1973 911 RS. The GT3, named after the Fédération Internationale de l'Automobile (FIA) GT class it was designed to compete in, has a 3.6-litre naturally aspirated six-cylinder engine, based on the unit used in the Porsche 962 and Porsche 911 GT1 race cars.
A number of variations, designed for road and track duty, have been introduced since its launch in 1999. The current range (997) includes three road and several racing models which are listed below. Since the start of the production in 1999 a total of 14,145 911 GT3 cars has been produced.
The GT3 has had a successful racing career in the one-make national Porsche Carrera Cup series, and the international Porsche Supercup. It has won championship and endurance races, including the GT class of the American Le Mans Series seven times, first overall in the 24 Hours of Daytona, and first overall at the 24 Hours Nürburgring six times.
Engine and transmission 
The engine of the GT3 sets it apart from most of the other 996 models although it shares the same basic 3.6 litre displacement of the standard 996 type so-called "integrated dry-sump" flat-six engine. Along with those of the GT2 and Turbo, it is based on the original air-cooled 911's versatile, true dry-sump crankcase, with an external oil tank. The original version of the GT3 had 360 PS (265 kW; 355 hp), compared to the 300 PS (221 kW; 296 hp) of the regular 996.
In GT3 configuration, this so-called "split" crankcase (meaning the parting line of crankcase is on the crankshaft centerline) uses, instead of a fan and finned cylinders, separate water jackets added onto each side of the crankcase to cool banks of three cylinders with water pumped though a radiator. Thus, the GT3 engine is very similar to the completely water-cooled 962 racing car's engine, which is based on the same crankcase. The 962 differs, however, by using six individual cylinder heads while the GT1/GT3, like the air and water-cooled Porsche 959, uses two cylinder heads, each covering a bank of three cylinders. The GT3 engine could thus also be thought of as similar to a 959 engine, but with the water-cooled cylinders.
Up to early model year 2004 GT3 production, the basic casting used for the crankcase of the GT3 was the same as the air-cooled engine. The "964" casting number was visible on the bottom of the crankcase, and on areas normally machined in air-cooled applications, but not in water-cooled ones. The crankcase casting was changed in mid-2004 to a "996" casting number crankcase to eliminate these external air-cooled remnants, but internally it was the same.
Because the 911 air-cooled crankcase uses the Porsche 356 engine to transmission mounting flange configuration, the GT3 uses a manual gearbox also of air-cooled 911 heritage. This gearbox has interchangeable gear ratios and is more durable making it more suitable for racing than the standard 911 type 996 gearbox.
At 500 hp (373 kW), the 4.0 litre flat-six engine in the 997 GT3 RS 4.0 is the most powerful six-cylinder naturally aspirated engine in any production car with a 125 hp (93 kW) per liter output.
Racing cars 
The following race versions were or are offered:
- 1998 996 GT3 Cup
- 1999 996 GT3 R
- 2000 996 GT3 Cup 
- 2001 996 GT3 RS
- 2004 996 GT3 RSR – with sequential gear box 
- 2005 997 GT3 Cup 
- 2007 997 GT3 RSR 
- 2008 997 GT3 Cup S 
- 2010 997 GT3 Cup
- 2010 997 GT3 R
- 2012 997 GT3 RSR
- 2013 991 GT3 Cup
Apart from numerous class wins, the GT3 won major events overall:
- 24 Hours Nürburgring in 2000, 2006, 2007, 2008, 2009, 2011
- Spa 24 Hours in 2003, 2010
- 24 Hours of Daytona in 2003
The various national Porsche Carrera Cup series, and the international Porsche Supercup which is mainly run at Formula One events, also use the GT3 Cup.
997 GT3 Cup 
997 GT3 Cup 3.8 (2009–2011) 
It is a Porsche Carrera Cups race car based on 911 GT3 RS. It includes 44 mm (1.7 in) wider rear body, 15 mm (0.59 in) lower front spoiler lip, 1.70 m (67 in) rear wing (from 911 GT3 Cup S race car), LED taillights, racing exhaust system with a fully controlled catalytic converter, a modified special exhaust system offering more dynamic and muscular sound (from Porsche Mobil1 Supercup cars), Porsche Ceramic Composite Brakes. 9.5Jx18 front alloy wheels with 24/64-18 Michelin racing tyres and 12Jx18 alloy wheels with 27/68-18 tyres, additional Unibal joints on the track control arms and front and rear sword-shaped anti-roll bars with seven position settings each, additional vent in the upper part of the front lid, steering wheel mounted Info Display with 6 switches, Carrara White body. The vehicle was unveiled in 2009 Frankfurt Motor Show.
Production model began delivery in 2009–10. European model has base MSRP of €149,850 (before tax).
997 GT3 R Hybrid 
The new Porsche 997 GT3 R Hybrid made its debut at the 2010 Geneva Motor Show. The hybrid technology featured in the car was developed by the Williams F1 Team and is based on their F1 kinetic energy recovery system (KERS) which they did not race in 2009. Unlike other KERS that were developed for F1, the Williams system is based on using kinetic energy stored in a flywheel rather than batteries. The GT3-R has two electric motors, both developing a total output of at least 218 brake horsepower (163 kW), driving the front wheels to supplements the 500 brake horsepower (370 kW) four-litre flat-six engine at the rear. It is planned to enter the car in the 2010 24 Hours Nürburgring. As part of the build up to the 24 hour race the GT3 Hybrid made its racing debut at the VLN 4 hour endurance 57th ADAC Westfalenfahrt at Nürburgring on March 27, 2010. On May 28, 2011, it won its first VLN race. At the 2011 24 Hours of Nurburgring, weight/restrictor penalties as well as technical difficulties prevented the R Hybrid from climbing higher than 28th place. The car also ran as an unclassified car at the 2011 American Le Mans Series at Monterey event; despite starting from last place, it finished ahead of all the other GT cars and also performed the fastest GT lap of the race.
997 GT3 RSR 
The Porsche 997 GT3 RSR has a dry weight of 1,220 kg (2,690 lb) and 563 bhp (420 kW; 571 PS). In 2007 Porsche had also installed front air louvers that channel air into the radiators and exit through the bonnet. For 2011 Porsche added splitters to the front and increased the tyre diameter to cope with the understeer problem. So far the GT3 RSR has been the most successful GT car ever.
Racing history 
Due to the absence of the official Porsche team in the 1999 24 Hours of Le Mans, only privateers with the nearly obsolete air-cooled 993 GT2 Turbo were expected to represent the marque, with few chances to beat the Chrysler Viper for GTS class honors. Two new race versions of the water-cooled 996 GT3-R were entered in the GT class by private teams. The car entered by the German Manthey Racing team finished 13th overall.
The 996 GT3-R were made available to privateer teams. In the 24 Hours Nürburgring of the year 2000, a factory-backed effort of the local Phoenix team managed to beat the Zakspeed Chrysler Viper that dominated this race from 1998 to 2000. The improved 996 GT3-RS version of 2001 was entered in countless races in the years to follow, scoring not only many class wins, but also overall wins at Daytona and Spa in 2003. In 2004, the 996 GT3-RSR was made available, with numerous improvements to the RS, including a sequential gearbox, which allows for faster gearshifts.
In 2005, the new 997-generation racing vehicles began to debut with the GT3 Cup, followed by the launch of the 911 GT3-RSR at the 2006 Spa 24 Hours. In VLN endurance races, the Manthey entry won the last 4h race before the 24h event, and then the big event also. Their Porsche 997 GT3 RSR has a larger front splitter, taller rear wing and a 500 bhp 4.0L Flat-6 engine.
Manthey is a favourite Porsche team in the 24h race. The driving squad of Timo Bernhard, Romain Dumas, Marc Lieb and Marcel Tiemann won for 4 consecutive years from 2006 to 2009. In 2008 they won after suffering from a leaky radiator early in the race which dropped them back 1 lap. The winner came from 1 lap down to nearly 2 laps ahead.
As a consequence of the 2009 air restricter regulations, the RSR lost 70 bhp, but Manthey won their 4th race.
In 2010, Manthey switched to the FIA GT3-spec Porsche 911 GT3 R. The car qualified 7th but was able to take 1st during the first lap and already on the grand prix circuit, before entering the Nordschleife. The car started to build the usual lead until a backmarker collided with the car, forcing it to retire. In 2011, Manthey began the race with a GT3 R and a GT3 RSR in identical livery and with the same drivers, retiring the GT3 R (used as option in case something happened with the RSR early on) after a couple of hours as it was clear that the RSR was the faster car in the long run. The RSR went on to win the race and brought Manthey their 5th Nurburgring 24-hour victory.
In 2012, Manthey raced without Porsche factory support (Manthey press release) and downgraded to the GT3-spec Porsche 911 GT3 R. Battling for third position with a Team Heico Mercedes-Benz SLS AMG GT3 during the final minutes of the 24h race, the Manthey Porsche 911 GT3 R ultimately ran out of fuel, rolling across the start/finish line just seconds before the race ended. Ultimately, the slowly-rolling Porsche, whose driver was not able to restart the engine to drive another lap, was then struck by a Renault Clio, putting it out of the race. As a result of that, the best-finishing Porsche in the 2012 Nürburgring 24 hours was the privately entered 911 GT3 R of the Frikadelli Racing Team in 6th place overall, driven by Sabine Schmitz, Klaus Abbelen, Christopher Brück and Patrick Huisman.
24 Hours of Le Mans 
Porsche dominated the GT/N-GT class at Le Mans after winning the 1998 24 Hours of Le Mans outright. There were no major competitors and Porsche took seven consecutive class wins. In 2006 the Porsches led for much of the race but one by one the competitors hit bowel problems and withdrew. Last minute mechanical issues threw the Seikel car back behind the surprising winner Panoz.
2007 saw the debut of the 997 GT3 RSR. IMSA Matmut took pole by more than a second over the Ferrari (but lost it after breaching Parc Fermé rules). The new Porsche was now fitted with wider rear tyres and bigger restrictors than the rules allow. This is compensated by the car weighing 100 kg more. The Porsche now stood at 1220 kg and 485 bhp. This was an advantage at Le Mans over the lighter and nimbler F430.
2008 is a carbon-copy of the 2006 race with Panoz emerging as the surprising winner after Porsche and Ferrari entrants fell down. Porsche was still able to maintain the status as the quickest GT2 car out there despite new restrictor regulations bringing the power down to 465 bhp.
In 2009 the Porsche was restricted even further to 450 bhp. ALMS entrant Flying Lizard started on pole again, although losing it immediately to the Risi Ferrari. The #70 Felbermayr-IMSA example ran out of fuel as the reserve tank switch failed. IMSA and Flying Lizard then led GT2 for a while until both collided at Indianapolis. IMSA retired on the spot and the Flying Lizard car underwent substantial repair, losing time and any hope for victory.
2010 was the year that Porsche finally lost their pole-winning streak. The drivers of the #77 car now claimed that they were about 0.5 seconds off the pace of the lead Ferrari and Corvette. Corvette, BMW and Jaguar all made their first GT2 appearance. The #80 Flying Lizard was the first to drop out after struggling with mechanical woes all week. The #77 Felbermayr Porsche then concentrated on keeping a close distance to the lead battle between Ferrari and Corvette. Risi retired at 1am due to a gearbox failure. The #64 Corvette had build a 2-lap lead over the #77 Felbermayr car. Later in 8am an aggressive pass by the #1 Peugeot cause the Corvette to spun and crashed. The car was repaired and went back out again but had to stop due to internal engine damage. This left the #77 Felbermayr-Proton in the lead, 2 laps over the Hankook Ferrari. The Porsche held on to that position and took the GT2 class victory, Porsche's 98th class and overall victory at Le Mans.
In 2011, despite running a flawless race, no Porsche was able to keep up with the front running Corvettes, BMWs and Ferraris. Porsche's best finish was 4th in GT2 for the Felbermayr-Proton team, 2 laps behind the winning Corvette.
Le Mans Series 
Felbermayr-Proton and IMSA-Matmut received the new 997 just before the 2007 season. Marc Lieb and Richard Lietz share the better of the two Felbermayr cars. Patrick Pilet and Raymond Narac share the IMSA car. Felbermayr-Proton won the championship in 2009 and 2010. In 2011, Nicholas Armindo won the GTE-Am class.
American Le Mans Series 
Flying Lizard and Tafel Racing were the first American customers of the Porsche. Both teams took delivery prior to the 2007 season. Flying Lizard took 2nd in the Sebring 12 Hours when a move in the final turn by the Risi Ferrari pushed the #45 Porsche to the outside. Bergmeister chased Melo down and made the pass out of turn 16 on the final lap until the controversial incident happened. Flying Lizard lost the 2007 championship to Risi Competizione.
Porsche avenged their loss at Sebring in 2008 by taking a Flying Lizard Motorsports 1-2. The team went into a battle with Tafel Racing all season long until Flying Lizard emerged out on top. The team won four GT2 victories in the season.
Flying Lizard won the 2009 championship again after a hard-fought season. The #45 was damaged at Sebring when the Panoz had to swerve in on the front straight. The team scored 5 consecutive victories after Sebring and held onto the championship lead. A controversial race end to the 2009 Laguna Seca prevailed. Magnussen in the Corvette chased Bergmeister's lead from 14 seconds to a car length. The #45 Porsche's tires was already worn out completely as a result of double-stinting. Magnussen tried numerous attempts to get past, one of which succeeded after Magnussen went into pit-out. He was forced to relinquish the spot back to Bergmeister immediately. Bergmeister drove defensively just to be hit hard by Magnussen coming out of the final corner. Bergmeister drove Magnussen left to the pit wall and the Corvette subsequently spun and crashed on the right side of the track. The #45 won by just a second ahead of the destroyed #3 Corvette.
Flying Lizard only won the drivers champion in 2010 after even more GT2 newcomers from BMW and Jaguar eroded Porsche's dominance. the GT2 class was now full of manufacturer presence. Flying Lizard won 4 class victories but the strength in the opponents begun to expose the team's weaknesses. While Ferrari, BMW and Corvette field 2 cars with equally professional experience, only the #45 at Flying Lizard was the professional crew, while the #44 did not have the level of driver skill to fight for the championship. This flaw helped BMW to win the teams championship but the #45 of Patrick Long and Jorg Bergmeister were able to clinch their 3rd consecutive drivers champion, revealing the strength of the drivers in the #45 car.
2011 did not begin well for Flying Lizard. The cars finished 6th and 7th at Sebring. After the rather abysmal performance at Sebring, IMSA immediately allowed them a 25 kg weight break over the rest of the GT field. The performance adjustments were only available in the ALMS under the control of IMSA, therefore this had no effect on the Porsches in Europe. This brought Flying Lizard back to the original 1220 kg design intent weight, and subsequently performance gains were witnessed at Long Beach. Despite all this, Long hit the wall at turn 9 and the #45 car retired with a broken suspension. The #45 proved to have better luck at Lime Rock, taking 2nd place (and Porsche's first podium for the year). The #17 Falken Tires Porsche also obtained a surprising 5th place. Unfortunately, at the following race at Mosport, mechanical problems for the #45 Flying Lizard forced it to retire. Falken Tires managed to take 5th place again with their car, however. The persistence of the Falken Tires team finally paid off at the Mid-Ohio Sports Car Challenge. A sudden late-race deluge of rain allowed the #17 to use its excellent rain tires to move from 6th all the way to 2nd place. A spin by the leading #45 Flying Lizard Porsche 911 allowed the #17 car to swing into first before the race was red-flagged, giving Porsche its first win of the 2011 season. After a decent race at Road America, Falken Tires came back once more with another victory at the inaugural Baltimore Grand Prix. The Flying Lizards faced even more trouble, barely managing to break the top-10 in the race.
FIA GT Championship 
Prospeed Competition was the main Porsche representative in the FIA GT Championship. However they faced the multiple Ferrari entrants and did not win a race in the 2007 season. 2008 saw a slight improvement with wins being scored at Monza and Nogaro by the #61 Prospeed car but the team came home only scoring half the total amount of points that AF Corse did. The 2009 season saw 4 GT2 victories by the #60 Prospeed Porsche and a controversial driver change put Emmanuel Collard out and Marco Holzer in the car to maximize Porsche's chance of winning the championship. Richard Westbrook clinched the GT2 drivers' title but Prospeed lost to AF Corse in the teams standings by 18 points.
In 2010 the FIA GT Championship was splitted and the GT1 cars will now have their own world championship. Originally the FIA proposed a European-based GT2 series but the plan was scrapped after all GT2 entrants opted to enter the Le Mans Series instead. The championship would be turned into an FIA GT2 European Cup with only 1 round at the 24 Hours of Spa. The GT2 winner of the event would then win the cup, even if they didn't win overall.
The 2010 Spa 24 Hours saw the usual Porsche entrants; Prospeed Competition, IMSA-Matmut and BMS Scuderia Italia. The fir st 2 teams fielded both GT2 and GT3 versions of the 997 GT3. The GTN-class BMW led and benefited from a collision which involved the #2 GT2 Ferrari and #50 GT3 Audi. The #79 BMW continue to led 1 lap ahead of the Porsche teams until suspension problems with only half an hour remaining threw the BMW back into 3rd place. BMW Scuderia Italia won with the IMSA entrant chasing them. Muehlner Motorsport Porsche also won the GT3 class after the Audis retired. Romain Dumas won Le Mans in the same year with Audi, and he won this event as well.
Prospeed Competition and Muhelner Motorsport were the main Porsche teams in the FIA GT3 Championship. Prospeed were able to clinch second in the 2010 championship behind the Callaway Corvette.
Road cars 
996 GT3 
As with Porsche's 911 RS models, the GT3 was devoid of any unnecessary items that would add weight to the car. Sound deadening was almost completely removed, as were the rear seats, rear loud speakers, sunroof, and air conditioning, although automatic air conditioning and CD/radio became no-cost optional add-ons. In addition, Porsche offered a no-cost option called the Clubsport package. This option replaced the standard electrically adjustable leather front seats with manually adjustable racing buckets finished in fire-retardant fabric, bolt-in half-roll cage, 6-point drivers racing harness (also replacing the standard side airbags), fire extinguisher (mounted in the front passenger footwell) and preparation for a battery master switch. The Clubsport option was never offered to US customers ostensibly due to the additional DOT crash testing that would have been required to allow US sales. Between 1999 and 2001 a total of 1,868 cars were built.
To bring the vehicle's track-prowess to the maximum level, Porsche endowed the GT3 with enlarged brakes, a lowered, re-tuned suspension system, lighter-weight wheels and a new front bumper with matched rear spoiler to help increase downforce, thereby increasing grip.
Porsche made significant updates to the GT3 for 2004, the first year the car was offered to US customers. Horsepower was raised to 381 hp (284 kW) and torque to 284 lb·ft (385 N·m), 80% of which was available from a mere 2,000 rpm. The braking setup was upgraded, now featuring 6-piston calipers on the front (rears remained 4-piston), and the Porsche Ceramic Composite Brake system was offered as an option. The new car also was updated to the 2002 911 facelift including headlights that were differentiated from the Boxster. The engine alone costs approximately 36,000 GBP as a replacement from Porsche due to the cost of the titanium parts.
In track testing by American automotive journals, the GT3 managed a 0-60 mph time of 4.5 seconds and a quarter mile time of 12.0 seconds at 118 miles per hour (190 km/h). During skidpad testing the vehicle posted 1.03g. Porsche introduced a revised 911 GT3 RS to the European market in 2003, marking the last revision of the 996 platform car before its discontinuation in 2005.
Porsche's official test-driver Walter Röhrl completed the Nürburgring Nordschleife with the 996 GT3 in 7 minutes 56 seconds, a feat which was used by Porsche to promote the car. Later, with the 996 GT3 RS, he managed 7 minutes 43 seconds.
996 GT3 RS 
The Porsche 911 GT3 RS is a high-performance sports car built by Porsche since 2003. It is often confused with the Porsche 911 GT3 RSR racecar of 2001 and later, which was based on the Porsche 911 GT3 R of 2000.
The RS (short for the German RennSport, literally "racing sport" in English) is mainly a carryover of the Porsche 911 GT3, albeit it is lighter thanks to a polycarbonate rear window, carbon fiber hood and rear wing. Porsche Ceramic Composite Brake (PCCB) Carbon fibre-reinforced Silicon Carbide (C/SiC) ceramic composite brakes, which are also more heat and fade resistant than the cast iron units fitted as standard, are optional.
The RS has a slightly different engine specification to the GT3. The cylinder heads of the GT3 RS have reshaped intake and exhaust ports for race homologation. Porsche claim the same 381 hp (284 kW) power output as the standard GT3 but Porsche's control dyno showed a jump to nearly 400 hp (298 kW)
The RS has progressive springs rather than linear. The dampers are uprated and are between 10 and 15 percent stiffer than the normal GT3 in bounce and rebound.
The wheel carriers are totally redesigned to maximize the improved dynamic camber control. The suspension top mounts can be turned 120 degrees to a cup car position. Both front and rear control arms are adjustable. The RS is 3 mm (0.1 in) lower than the standard car.
The RS rear wing delivers 35 kg (77 lb) of downforce at 125 mph (201 km/h). The RS has ram air ducts on the engine bay which force air into the intake with 18Mb of pressure at 187 mph (301 km/h) and this is enough to create an additional 15 bhp (11 kW; 15 PS). That extra bhp cannot be homologated since the official engine output figures are certified on a dyno.
Only 140 right hand drive GT3 RS cars were built by Porsche and 113 of those were officially imported into to the UK. The GT3 RS was not sold in USA or Canada.
The original Porsche 996 GT3 RS had a production run from 2003 to 2005. The "RS" moniker, and the characteristic lightweight blue or red wheels and "GT3 RS" side stickers link the GT3 RS to historically important Porsches such as the Carrera 2.7 RS of the early 1970s.
Automobile magazines claim the GT3 RS can accelerate from 0-60 mph in about 4.3 seconds, maintain over 1.0g on the skidpad, and have a top speed of around 190 mph (306 km/h).
997 GT3 
In February 2006, Porsche revealed the latest street-legal version of the GT3, now built on the new 997 platform. Prior to that, 997 had already been in active race use for several months. In addition to a new 415 hp (309 kW) 3.6 litre flat-six engine, the vehicle features "zero lift" aerodynamics, meaning the car creates only aerodynamic downforce but no "lift", which pulls upwards and away from the road surface and affects overall grip. The vehicle now makes use of a modified, track oriented version of Porsche's active PASM suspension making this the first of Porsche's RS or GT3 versions to feature an electronically adjustable suspension system. Also available are a navigation system and Porsche's "sports chrono" gauge package, making this the most "friendly" lightweight track car the company has ever produced. The car went to sale in summer of 2006 and had a starting price of 106,000 USD. The RS was released in Europe in October 2006 and in North America in spring 2007.
The vehicle has a rated 0-60 mph time of 4.1 seconds and has a top speed of 193 miles per hour (311 km/h). Road and Track was able to achieve a 0-60 mph run in 3.8 seconds. Porsche's official test-driver Walter Röhrl completed the Nürburgring Nordschleife in 7 minutes 42 seconds with the 997 GT3. Cited in an interview with Mr. Röhrl by Swedish sports car magazine Automobil 5.06.
In 2009 Porsche launched the 2nd Generation 997 GT3, boasting an enlarged 3.8 litre engine producing 435 bhp (324 kW; 441 PS). It also featured a number of new options including dynamic engine mounts and a pneumatically lifting front axle to compensate for the low ground clearance. The rear spoiler was also modified along with other parts of the bodywork. Deliveries in Europe commenced in October the same year.
997 GT3 RS 
As with earlier models, such as the Carrera RS 2.7 of 1973 and the Type 964 911 RS of 1991, Porsche offered an RS version of the 997 GT3. In common with its predecessors, it provides a homologation model for use in a range of racing series.
Thanks to a close-ratio six-speed transmission with a single-mass flywheel, the engine revs up even more freely, thus enabling the 911 GT3 to sprint from zero to 100 km/h (62 mph) in 4.0 seconds (4.0 s in the 2010 gen 2 model) while reaching 200 km/h (124 mph) in 13.3 seconds. Maximum speed is 310 km/h (193 mph).
The RS is 20 kg (44 lb) lighter than the GT3, weighing in at 1,375 kg (3,031 lb). This weight-saving was achieved by the use of an adjustable carbon fiber wing, a plastic engine cover, and a lightweight plastic rear window. The weight savings gives the RS model corresponding engine power to curb weight ratio of 300 bhp (220 kW) per tonne.
One characteristic of the new RS is the body, which is 44 mm (1.7 in) wider at the rear (a legacy from the Carrera 4 models with which it shares its shell) by comparison with the 911 GT3. The muscular-looking rear end conceals a wider track that not only improves directional stability but also increases the potential cornering grip of the two-seater coupe. On the other hand, drag is increased, and top speed reduced.
In addition to the new technology featured in this flat six motor car, the paint scheme and body panels are all designed specially for this car. For the RS version, the limited edition orange color was mixed specially for this car.
The American version of the RS has a standard rear window (not plexiglas) and the smaller 911 fuel tank to comply with rules of SCCA, Grand-Am, and IMSA. For Grand-Am races, the central locking wheel nut is replaced with the standard five-lug pattern required under Grand-Am rules.
For 2010, the new (or second generation) 911 GT3 RS received an additional 35 PS (26 kW; 35 hp) due to a new 3.8-liter flat-six, bringing total power output up to 450 PS (331 kW; 444 hp). This car will not be raced in the United States as both IMSA American LeMans has not approved the new car for competition. Grand-Am originally did not approve the car, but after performance issues (a Porsche team did not compete at the Indy Grand Prix of Alabama round), Grand-Am approved the second-generation car in April 2010.
Fifth Gear (known British television) carried out a road test on the Porsche 911 GT3 RS 2011 which highlighted the exceptional performance of the car
Porsche test driver Walter Röhrl had intended to enter the 2010 24 Hours of Nürburgring on a standard road legal 911 GT3 RS, but had to withdraw due to health reasons from the team that comprised racers Roland Asch and Patrick Simon, plus journalists Horst von Saurma and Chris Harris. The car, entered in cooperation with sport auto (Germany), is registered as S-GO 2400, and was driven from Weissach to Nürburg. The RS was modified according to safety requirements, which included a larger roll cage and fire extinguisher. As no race tyres were available for 19" rims, the 18" wheels of the Cup racers were used. Asch has qualified with 9:15, 42nd overall, and 9th among the 17 SP7 class entrants, only beaten by its race-prepped Porsche 997 siblings. In an otherwise disappointing race for Porsche, with the best race 997 finishing only 6th, the road legal car did 145 laps, only 9 less than the winning BMW, for place 13. It supposedly had to cover another 306 km, on the Autobahn back home.
997 GT3 RS 4.0 
The 911 GT3 RS 4.0 is the final evolution of the 997 and features a 4.0 litre engine. The engine itself uses the crankshaft from the RSR with increased stroke dimensions (from 76.4mm to 80.4mm). This change has increased the power to 368 kW (500 PS; 493 hp) at 8250 rpm and 460 N·m (339 lbf·ft) of torque at 5750 rpm. Chassis development has been influenced by the GT2 RS and uses bits from other RS 911s. Front dive planes give additional downforce up front. The car weighs in at 1,370 kilograms (3,000 lb), giving it a power-to-weight ratio of 365 bhp per ton. Only 600 cars will be built.
Performance is a 3.9 second 0-100 kilometres per hour (62 mph) time and a top speed of 193.
991 GT3 
The completely-redeveloped fifth generation of the 911 GT3 occupies the top position among Porsche sports cars with naturally-aspirated engines. Following the total production of 14,145 GT3 cars since 1999, the fifth generation of the 911 GT3 is a new car from the ground up.
The powertrain of the new 911 GT3 comprises a 3.8-litre flat engine developing 475 hp (350 kW) at 8,250 rpm, a Porsche Doppelkupplung (PDK) double-clutch gearbox, and high-traction rear-wheel drive. The six-cylinder engine is based on that fitted in the 911 Carrera S, but shares only a few common parts. All other components, particularly the crankshaft and valve train, were specially adapted or developed for the GT3. For example, Porsche is once again using titanium connecting rods attached to forged pistons. These basic modifications set the stage for an extreme high-revolution engine capable of reaching up to 9,000 rpm. The dual-clutch gearbox is another feature specially developed for the GT3, with characteristics inspired by the sequential gearboxes used in motor racing, thus granting the driver further benefits when it comes to performance and dynamics.
The new 911 GT3 once again sets fresh record performance values. At full acceleration from a standstill, 0-100 kilometres per hour (62 mph) is passed after just 3.5 seconds, and 124 mph in less than 12 seconds. The top speed of 195 mph is reached in seventh (and thus top gear) of the PDK transmission. The lap time on the Nürburgring-Nordschleife is even more impressive: the new 911 GT3 completed this track, commonly regarded as the most difficult in the world, in less than 7:30 minutes. While every Porsche is proven around the Nürburgring, this credential is particularly relevant for the new model as around 80 per cent of 911 GT3 customers also drive their cars on race tracks.
Specifications (road cars) 
|Car||Years of Production||Engine Displacement||Power (bhp)||Power (kW)||Weight in Pounds||Weight in Kg||Units Built|
|996 GT3 (Mk1)||1999-2001||3.6||360||268||2,976.2||1350||1,868|
|996 GT3 (Mk2)||2003-2005||3.6||381||284||3,042.4||1380||2,313|
|996 GT3 RS||2003-2004||3.6||381||284||2,998.3||1360||682|
|997 GT3 (Mk1)||2006-2009||3.6||415||309||3,075.4||1394||2,378|
|997 GT3 RS (Mk1)||2006-2009||3.6||415||309||3,031.4||1375||1,909|
|997 GT3 (Mk2)||2009-2011||3.8||435||324||3,075.4||1394||NA|
|997 GT3 RS (Mk2)||2009-2011||3.8||450||336||3,020.3||1370||Approx. 1,600|
|997 GT3 RS 4.0||2011||4.0||500||373||2,998.3||1360||600|
See also 
- 9ff GT9, a high-speed automobile, based on the 997 GT3
- Ruf RGT, a sports car similar to the GT3 built by Ruf Automobile
- "evo - Porsche 911 GT3 RS 4.0 news, pictures and video". Evo. 2011-04-28. Retrieved 2011-07-13.
- [dead link]
- [dead link]
- "911 GT3 Cup (Type 997) – Racing cars / Racing components – Motorsports – Dr. Ing. h.c. F. Porsche AG". Porsche.com. Retrieved 2009-07-19.
- "911 GT3 RSR (Type 997) – Racing cars / Racing components – Motorsports – Dr. Ing. h.c. F. Porsche AG". Porsche.com. Retrieved 2011-04-24.
- [dead link]
- Harper, Jason H. (2012-04-05). "Porsche $250,000 GT3 Racecar Is Too Hot for the Street". Bloomberg. Retrieved 2012-05-16.
- Tan, Paul. "Porsche 911 GT3 R replaces the GT3 Cup S". Paultan.org. Retrieved 2011-04-24.
- "Porsche reveals new GTE car". Racecar Engineering. 2011-11-04. Retrieved 2012-05-16.
- Joseph, Noah (2009-08-26). "Pavlov's Bell: Porsche reveals, prices new 911 GT3 Cup racer ahead of Frankfurt debut". Autoblog.com. Retrieved 2010-12-14.
- Neil, Dan (12 November 2011). "Porsche Blasts Hybrids Into a New Stratosphere". The Wall Street Journal. p. D14.
- Starting gun for sales of the Porsche 918 Spyder hybrid super sports car http://www.porsche.com/latin-america-es/aboutporsche/pressreleases/?pool=international-de&id=2011-03-21
- 911 GT3 R Hybrid Celebrates World Debut in Geneva Porsche Official Website 2010-02-11 Retrieved 2010-02-19
- Porsche to use Williams hybrid system Autosport Website 2010-02-11 Retrieved 2010-02-19
- Suspension rises: Dream start field at the start of the season VLN Langstreckenmeisterschaft Website 2010-03-23 Retrieved 2010-05-02
- "Porsche feiert historischen Hybrid-Sieg – VLN Langstreckenmeisterschaft Nürburgring" (in (German)). Vln.de. Retrieved 2012-03-29.
- Porsche 918 RSR – racing laboratory with even higher-performance hybrid drive http://www.porsche.com/latin-america-es/aboutporsche/pressreleases/?pool=international-de&id=2011-01-10
- Cited in an interview with Mr. Röhrl by Swedish sports car magazine Automobil 5.06.
- Elfalan, Jonathan (September 2009). "2010 Porsche 911 GT3". Road & Track (Hachette Filipacchi Media) 61 (1): 59. Retrieved August 15, 2009.
- "GT3 RS Registry". GT3 RS Registry.
- "Issue 66". Total 911 Magazine.
- "2010 Porsche 911 GT3 RS: Track-Ready, Street-Legal And More Power". Jalopnik.com. Retrieved 2009-08-19.
- "Grand-Am to allow performance Enhancement for Porsches". Grand American Road Racing Association. 2010-04-16. Retrieved 2010-07-23.
- alexonx (November 10, 2010). "Fifth Gear test the Porsche 911 GT3 RS 2011". Motoriblog.net. Retrieved November 10, 2010.
- "January - March - Archive 2010 - Porsche AG - Dr. Ing. h.c. F. Porsche AG". Porsche.com. Retrieved 2011-04-24.
- "24h-Projekt Langstreckenrennen Nürburgring 2010: Rennwagenumbau Porsche 911 GT3 RS | sport auto". Sportauto-online.de. 2010-03-24. Retrieved 2011-04-24.
- [dead link]
- "evo - Porsche 911 GT3 RS 4.0 news, pictures and video". Evo. 2011-04-27. Retrieved 2001-04-30.
- Kable, Greg (June 2i7, 2011). "Great Just Got Better". AutoWeek (Crain Communications Inc.) 61 (13): 37. ISSN 0192-9674.
- "Press Information - The new Porsche 911 GT3". http://press.porsche.com. 2013-03-04. Retrieved 2013-04-14.
- "Porsche celebrates the 50th anniversary of the 911 with a new GT3". porsche.com/uk/. 2013-03-04. Retrieved 2013-04-01.
- "Porsche 991 GT3 new release, Geneva Auto Show 2013". . 2013-03-04. Retrieved 2013-03-04.
- "991 GT3 FULL PRESS PACK". pistonheads.com. 2013-03-04. Retrieved 2013-04-01.
- "Issue 66". Total 911.
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