To limit power, all forced induction cars were fitted with a 34 mm diameter air restrictor before the turbocharger inlet, limiting the air flow to about 10 cubic meters per minute. The restriction was intended to limit power output to 300 hp although some WRC engines were believed to produce around 330–340 hp. Engine development did not focus on peak power output but towards producing a very wide powerband (or power curve). Typically, power output in excess of 300 hp was available from 3000 rpm to the 7500 rpm maximum, with a peak of 330–340 hp at around 5500 rpm. At 2000 rpm (the engine idle speed in "stage" mode) power output was slightly above 200 hp.
McRae, made his debut on the gruelling Dakar Rally Raid with Nissan in January 2004, and impressed the team by scoring two stage wins on his way to a memorable finish on the gruelling Sahara event. He returned to the Dakar in 2005 and was fastest on two of the first three stages in Morocco, before crashing out of the rally towards the end of stage six.
The First World War brought a lull to rallying. The Monte Carlo Rally was not resuscitated until 1924, but since then, apart from World War II and its aftermath, it has been an annual event and remains a regular round of the World Rally Championship. In the 1930s, helped by the tough winters, it became the premier European rally, attracting 300 or more participants.
Two ultra long distance challenges took place at this time. The Peking-Paris of 1907 was not officially a competition, but a "raid", the French term for an expedition or collective endeavour whose promoters, the newspaper "Le Matin", rather optimistically expected participants to help each other; it was 'won' by Prince Scipione Borghese, Luigi Barzini, and Ettore Guizzardi in an Itala. The New York–Paris of the following year, which went via Japan and Siberia, was won by George Schuster and others in a Thomas Flyer. Each event attracted only a handful of adventurous souls, but in both cases the successful drivers exhibited characteristics modern rally drivers would recognise: meticulous preparation, mechanical skill, resourcefulness, perseverance and a certain single-minded ruthlessness. The New York–Seattle race of 1909, if shorter, was no easier. Rather gentler (and more akin to modern rallying) was the Glidden Tour, run by the American Automobile Association between 1902 and 1913, which had timed legs between control points and a marking system to determine the winners.
Starting in 2011, rules for WRC cars changed to be more restrictive. Now regulations were derived from Super 2000 cars with a different aerodynamic kit. The cars were smaller models (there was no longer a minimum 4m length), with a 1600 cm3 direct injection turbo-charged engine with a 33 mm diameter air restrictor and a maximum pressure of 2.5 bar absolute (this will limit torque to about 400 N.m or less).
In many rallies, including those of the World Rally Championship (WRC), drivers are allowed to run on the stages of the course before competition and create their own pacenotes. This process is called reconnaissance or recce. During reconnaissance, the co-driver writes down shorthand notes (the pacenotes) on how to best drive the stage. Usually the drivers call out the turns and road conditions for the co-drivers to write down. These pacenotes are read aloud through an internal intercom system during the actual race, allowing the driver to anticipate the upcoming terrain and thus take the course as fast as possible.
In an attempt to cut costs, since 2006 new regulations required mechanical front and rear differentials, while the central differential remained active. Active suspension and water injections were also prohibited. Cars entered by a manufacturer had to be equipped with the same engine for two rallies; further limitations were imposed on the changing of some parts, including suspension, steering, turbochargers and gearboxes.
The ultimate Grey Poupon car, except sideways on dirt. Funded by Christian Dior and his Jules fragrance, the Corniche rally car competed in the fearsome Paris-Dakar. In truth, there's very little Rolls-Royce to the Corniche rally car: it's a tubular chassis fitted with a four-wheel-drive system from a Toyota Land Cruiser and a small-block Chevy V-8. But, it looks like a Rolls, and that's what counts.
Rally is a form of motorsport that takes place on public or private roads with modified production or specially built road-legal cars. It is distinguished by running not on a circuit, but instead in a point-to-point format in which participants and their co-drivers drive between set control points (special stages), leaving at regular intervals from one or more start points. Rallies may be won by pure speed within the stages or alternatively by driving to a predetermined ideal journey time within the stages.
Following his win at the Brands Hatch meeting of the 2007 World Touring Car Championship season, Andy Priaulx dedicated it to McRae, commenting that his death "shows how fragile life can be". McRae's former rival, four-time World Rally Champion Tommi Mäkinen commented the helicopter accident as terrifying news, and described McRae as "a pleasant fellow and a tough rival". Valentino Rossi, who was taught the basics of driving a rally car by McRae, said he was shocked and saddened by the sudden departure of the former World Rally Champion. Valentino dedicated his win at Estoril MotoGp in 2007 to Colin McRae saying to the media "I want to dedicate this to Colin McRae. He was one of my big idols when I was very young and it's because of him I have a big passion for rally".
These events were road races in all but name, but in Italy such races were still allowed, and the Mille Miglia continued until a serious accident in 1957 caused it to be banned. Meanwhile, in 1981, the Tour de France was revived by the Automobile-Club de Nice as a different kind of rally, based primarily on a series of races at circuits and hillclimbs around the country. It was successful for a while and continued until 1986. It spawned similar events in a few other countries, but none survive.
In August 2007, McRae claimed to still be working on finding a seat for the 2008 WRC season, stating that "if it doesn't happen next year, then I won't (return) because you can only be out of something at that level for so long." In 2017, talking to Autosport podcast, David Richards confirmed that he and McRae had talked about McRae's comeback to Subaru for season 2008. Robert Reid was contacted by McRae who asked him to be his co-driver and the pair was due to test together, but unfortunately the test never happened because of McRae's fatal helicopter accident.
1968 brought the first of a series of British-organised intercontinental rallies, the Daily Express London-Sydney Marathon, which attracted over 100 crews including a number of works teams and top drivers; it was won by the Hillman Hunter of Andrew Cowan/Brian Coyle/Colin Malkin. Not to be outdone, the rival Daily Mirror sponsored in 1970 the London-Mexico World Cup Rally, linking the stadia of two successive football World Cups, on a route that crossed Europe to Bulgaria and back before shipping out from Lisbon to Rio de Janeiro, after looping around South America, and a run through some of the most frightening sections of Peru's road race, the Caminos del Inca, they wrap it up being shipped to Panama and a final run up Central America. The Ford Escort of Hannu Mikkola and Gunnar Palm won. These were followed in 1974 by the London-Sahara-Munich World Cup Rally, and in 1977 by the Singapore Airlines London-Sydney Rally.