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Rally Vocabulary:
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Aerofoil: Normally a front or rear wing with a curved surface that's designed to produce maximum aerodynamic downforce at a certain speed.

Control Arm: A suspension element that has one joint at one end and two points at the other, typically the chassis side. Also known as as a wishbone or an A-arm.

Quattro - This is the official nomenclature that Audi uses to signify their four-wheel drive models.

Roo-Bars: This is the racer's abbreviation for "Kangaroo Bars," which are metal bars welded to the chassis that protrude from the front of the car, protecting the radiator area. Almost always used during events is Africa, roo-bars help minimize damage inflicted to the car when it strikes an animal.

Special Stage: This is a section of the rally closed to other traffic and timed to the nearest fraction of a second, on which drivers try to set the fastest time possible. The team with the lowest cumulative special stage timers (plus any penalties incurred) wins the rally.

Torsion Bar: A type of suspension spring, consisting of a straight bart anchored at one end to the chassis and the other to a suspenion link. The twisting force provides the springing or torsion.

Synchromesh: A gear systemm that mashes the speeds of the gear wheels before they are engaged, facilitating a smoother shift.

Active Suspension: A suspension system controlled by a computer. It works by reacting to sensors and providing the necessary suspension movements by electronically controlling hydralic actuators.

Bump: In relation to suspension travel, bump is the term used to describe the movement within a damper caused by the wheel moving up relative to the chassis.

Co-Driver: In rally racing, there is both a driver a co-driver. The co-driver is also knows as a navigator, because he is solely responsible for keeping the team on track throughout the race.

Homologation: The approval through adherence to a set of technical regualations allowing a competition car to compete in a defined category of motorsport. You'll often see cars titled as "Homologation Special" and the like.

Lightpod: This is the name given to a single cluster of lights attached to the bonnet of a rally. If you didn't know already know, light plays a huge role in rally cars, unlike tradionational racing here in the United States.

Pace Notes: A consise, written description of the severity of the corners, distances between corners and specific hazards that may be encountered on a rally route. These notes are read out loud to the driver by the co-driver during the race to help with prediction and accuracy.

Opposite Lock: A technique in which the steering wheel is turn 180 degrees away from where the car is turning. This is used to control a car when it is oversteering and the rear end is spinning out. Very, very common in rally racing.

 Data-Logging: The recording and storage process of computerized data signals, generated from sensors places on specific components of the rally car. This data is then analyzed after the race to determine what went wrong, if anything.

Gravel Crew: The crew that precedes the rally cars, surveying road conditions and relaying the information back to the drivers.

Liter: A liter is a metric measurement of volume or approximately 0.26 gallons. It is commonly used as a measure of an engine's displacement. One liter is equal to approximately 61 cubic inches.

Parc Ferme: A closed area where rally cars are parked overnight or during breaks. Apart from parking or retrieving the vehicle, all access is forbidden.

Rallycross: Contrary to popular belief, standard rally racing is quite different from rallycross. Rallycross is a form of circuit racing invented for television, intended to provide a mixture of cicuit racing and rallying for cars very similar to rally cars, but not exactly the same.

Sumpguard: A sheet of material (i.e. metal, carbon fiber) placed under a car's engine bay to protect the engine's oil sump from damage.

Tire Warmers: Unlike traditional racing where competitors can simply warm up their tires on the track, rally racing begins from a dead stop. As such, they often use electrically heated thermal blankets to warm up their tires before starting the rally.

Track Width: No, it's not the width of the track the cars are on. It's the horizontal distance between the centers of two wheels on the same axle. The word "track" is referring to the car's footprint, per se.

Wastegate/Blow-Off Valve: A valve for releasing excess boost pressure from a turbocharger.
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