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The force exerted upon drivers as they go through various areas of a racetrack. High-speed corners exert more G-force on drivers than do slower corners. One "G" is equal to the force of gravity. Open-wheel drivers often endure up to five "G's."
Grand Touring From the Italian Gran Turismo. A car combining sedan and sports car features in which engineering is the dominant feature. Combines excellent road handling qualities with relative comfort. Made in two- and four-seaters with the rear seats always cramped.
Gap Insurance/Protection
Stands for Guaranteed Auto Protection insurance. Extra insurance for lease customers to cover the difference in the actual value of the vehicle and whatever is owed on the lease. Important if the car is stolen or totaled early in the lease term. It also covers the difference in value between what may be paid by an insurance carrier and what is still owed to the leasing company, including future lease payments.
Area of race track where cars are housed during an event; work area for car preparation while at a speedway.
Gas can
Large steel can used to fill the tank of NASCAR racers during a pit stop. A car usually holds two 10 gallon cans of fuel.
Gas Cans
The fuel cans a pit crew member wields to refuel a stock car weigh about 100 pounds each when full. Typically the gas man empties two fuel cans during a pit stop.
Gas Catcher
The person on a NASCAR pit crew that uses a small catch can to catch the overflow of gas from a rear pipe as the tank is filled on a pit stop.
Gas Man
The person on a pit crew with the job of filling the car with fuel from either a can (NASCAR venue) or from a filler hose (IRL, CART or F1)
Gas Turbine
An internal-combustion rotating engine with one main moving part: the rotor with pinwheel-like blades attached. Air is compressed by the first rows of blades and delivered to the combustion chambers, from which the exhaust is directed to pass the remaining blades and to generate the power. Power is extremely smooth due to the absence of explosions and reciprocating parts.
Gas-Charged Shocks
Also called gas-filled shocks. They are shock absorbers filled with a low-pressure gas to smooth the vehicle's ride during up-and-down movement.
A thin material, made of paper, metal, silicone, or other synthetic materials, used as a seal between two similar machined metal surfaces such as cylinder heads and the engine block.
Gasoline Alley
This is the garage area at Indy, where major mechanical work is done on the cars.
A drag racer that runs on gasoline.
An instrument, usually mounted on the dashboard, used to monitor engine conditions such as fuel pressure, oil pressure and temperature, water pressure and temperature, and RPM (revolutions per minute).
Gave Up
Drivers use this to describe a mechanical part that fails.
General Competition Regulations. Midwestern Council Annual Racing Rule and Information book.
Gear Box
Racing term for a transmission.
Gear Ratio
The ratio of engine RPM's to rear wheel RPM's. This determines the how fast the car will run on the race track as well as the fuel efficiency of a racecar. More speed requires more fuel.
Wheels with meshing teeth to transmit power between rotating shafts. When the gear wheels are of different sizes, a change in speed ratio occurs. Gears are made of hard steel.
General Property Taxes
Any tax on real estate or personal property.
A device that converts rotational energy to DC current. Generators were used in older cars to provide electrical energy for the vehicle.
Geometric Apex
A point on the inside of the track at a point that bisects the angle of the entering straight and the exit straight. The geometric center of the turn.
Gilmer Belt
Toothed or splined drive belt used with matching pulley, generally a non-slip drive belt.
Great Lakes Sports Car Club
GingerMan Raceway, South Haven MI. 1.8 mile road racing course.
Go into the Country
To leave the track, in road racing.
Goes Up Through the Gears
Refers to a driver upshifting from the lowest to the highest gear.
Good Faith
A code of conduct between parties emphasizing honesty during the transaction.
Bumping and running, especially on Dale Earnhardt and anyone faster than you; Also see Jeff Gordon racing
Got the Green
A green flag is used to restart the race. The pace car will pull off the track into pit lane and the race resumes. Note: the race cars do not come to a stop on the track at anytime, unless a red flag is thrown.
Got Under
A driver out brakes an opponent on the inside of a turn and makes a pass.
Grand Prix - The most important races in a given sport.
Grand National Circuit
This was the previous name for Winston Cup Racing before R.J. Reynolds became the sponsor in 1972.
Grand National Division
Now the Winston Cup Series. The Grand National Division was the name of the points championship from 1949-1970.
Grand Prix
This French term meaning grand prize is widely used to refer to a race. At one time in racing, it was used exclusively for a series' grand finale, usually the most important race.
Gravel Pit or Trap
A gravel or sand pit at the side of a turn on a road course, to slow a car that misses the turn and keep it from crashing into a wall. Referred to by some drivers as 'kitty litter.'
Area on a paved track where nobody runs, particular in the corners. Sometimes it actually is visibly a lighter color than the groove. The gray area is often full of marbles and other loose material that causes a servere loss of traction for any car that goes there.
Gray Market Vehicle
Any car that is imported, but not through authorized retailers. May have insufficent emissions standards.
[1] The state of the track when a green flag is in effect; the opposite of a caution period.

[2] A track which is either newly paved, or has experienced heavy rain since the last time the track was raced on, or just hasn't been used in a while. A "green" track lacks the accumulation of tire rubber that builds up when the track is raced on, which changes the handling characteristics of cars that race on the track.
Green Flag
Flag used to start or restart a race.
Green Light
[1] The light that starts a drag race.

[2] Used on some oval tracks to indicat the race is under competetion conditions.
Green Track
A track that has little or no rubber on it from previous races. A green track is a bad condition that allows little or no traction for a race car.
The upper area of a race car that extends from the base of the windshield in the front, the tops of the doors on the sides, and the base of the rear window in the back. Includes all of the A, B and C pillars, the entire glass area, and the car's roof.
The arrangement of cars in the starting lineup; at the Indianapolis 500, the grid is made up of 11 rows with three cars per row.
An opening in the front of the vehicle that allows air to reach the radiator.
Slang term for a race car's brakes.
How well the tires maintain traction through contact with the racing surface. More grip in a corner allows higher cornering speeds and better acceleration onto the straights.
Slang term for the best route around a racetrack; the most efficient or quickest way around the track for a particular driver. The "high groove" takes a car closer to the outside wall for most of a lap, while the "low groove" takes a car closer to the apron than the outside wall. Road racers use the term "line." Drivers search for a fast groove, and that has been known to change depending on track and weather conditions.
Gross Capitalized Cost
See Capitalized Cost.
Gross Income
The income of the borrower before taxes or expenses are deducted; used to qualify for a loan or a lease.
Gross Vehicle Weight Rating
The curb weight of the vehicle plus the maximum load it is designed to carry.
Ground Effects
The result of aerodynamic designs that channel air under the car to create a low-pressure area or partial vacuum between the racecar and the racetrack. Tunnels under the car create downforce, which sucks the car to the track, providing increased grip.
When the circumfrence of a tire increases as the tire gets hotter.
Grand Touring; originally from the Italian Gran Turismo, meaning a sedan built in limited quantities and designed to provide fast, comfortable transportation over fairly long distances.
Grand Touring (Sports) - Lower specification GT Class in sportscar racing, formerly GT2.
Guard Beam
A light beam-to-photocell commection located 16 inches past the stage beam that is useed to prevent a competitor from gaining an unfair starting-line advantage by blocking the stage beam with a low-installed object such as an oil pan or header collector pipe. If the guard beam is activated while the stae beam is blocked, the red foul light is triggered on the Christmas Tree, and the offender is automatically disqualified.
Guard Beams
A light beam-to-photcell connection located 16 inches past the staged beam that is used to prevent a competitor from gaining an unfair starting-line advantage by blocking the stage beam with a low-installed object such as an oil pan or header collector pipe. If the guard beam is activated while the staged beam is still blocked, the red foul light is triggered on the Christmas Tree and the offender is automatically disqualified. (Drag racing)
Gurney Flap
A vertical extension to the back edge of an Indy car wing invented by racing legend Dan Gurney to generate more downforce, especially at higher angles of attack. This device is usually made of metal, aluminum or carbon fiber and is also known as a wickerbill or a return.
A nickname for any driver sporting a goatee.
A competition in which cars are driven around a twisting course, executing certain specified maneuvers, against the clock.
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