185 terms in the arena
Air-fuel ratio. The ratio of air to fuel by mass in the engine combustion chamber. 14.7:1 is stoichiometric for gasoline.
An adjustable suspension system using air bags instead of metal springs. Allows variable ride height with the push of a button.
German BMW tuner founded 1965 by Burkard Bovensiepen. Operates as a niche manufacturer producing limited-edition BMW variants with a unique character.
A turbocharger control system that maintains turbo speed during throttle lift, eliminating turbo lag during reapplication of throttle.
A motorsport format using cones to define a course on a parking lot or airfield. Drivers compete one at a time for fastest lap.
All-wheel drive. Power is delivered to all four wheels, either continuously or on demand based on traction needs.
An air suspension system that uses inflatable rubber air bags in place of conventional coil springs, allowing ride height to be adjusted via a compressor and air management system.
An old, neglected vehicle discovered in storage (often a barn, garage, or shed) after years or decades of inactivity. Often valuable for restoration.
A wheel with a clamping mechanism that locks the tire bead to the wheel rim, allowing low tire pressures without losing the bead. Used in off-road and racing.
An aftermarket brake upgrade with larger rotors, multi-piston calipers, and stainless steel braided lines. Common in track-focused builds.
A vehicle structure where the body sits on a separate ladder frame. Common in trucks, traditional SUVs, and serious off-roaders.
The number of lug bolts and the diameter of the circle on which they are arranged. Determines wheel-to-vehicle compatibility.
Japanese motorcycle gang culture from the 1970s-1980s, with a related car styling subculture featuring aggressive aero, exhaust, and paint schemes.
Blow-off valve. A valve that releases boost pressure when the throttle closes, preventing compressor surge in turbocharged engines. The famous "psh" sound.
German Mercedes-Benz tuner founded 1977. Specializes in extreme performance and luxury modifications for Mercedes models, including the famous Brabus Rocket.
Hydraulic fluid that transfers force from the brake pedal to the brake calipers. Must be replaced periodically due to moisture absorption.
A 1960s and 1970s Volkswagen Beetle modification style. Lowered, fenderless or with cut fenders, with specific wheels and clean detailing. California origin.
The angle of the wheel relative to vertical when viewed from the front. Negative camber tilts the top of the wheel toward the car center.
The shaft with lobes that operate intake and exhaust valves. Camshaft profile (lift, duration, timing) determines engine power characteristics.
An informal grassroots car meet format held in parking lots on weekend mornings, where enthusiasts gather to display and discuss their vehicles over coffee with no registration or entry fee required.
The rearward or forward tilt of the steering axis when viewed from the side of the vehicle, affecting straight-line stability, steering return-to-center, and high-speed handling.
An emissions device that converts exhaust pollutants into less harmful gases. Required for emissions compliance; often replaced or removed in racing.
An aftermarket exhaust system replacing everything from the catalytic converter back. The most common exhaust upgrade.
A drift initiation technique where the driver rapidly depresses and releases the clutch to spike engine RPM and send a sudden torque pulse to the rear wheels, breaking traction to start a slide.
An adjustable suspension system combining the coil spring and damper into one unit, with adjustable height and damping rate.
An aftermarket air intake system designed to draw cooler air from outside the engine bay, increasing engine power slightly.
The ratio between the cylinder volume at BDC (bottom dead center) and at TDC (top dead center). Higher ratios make more power but require higher octane fuel.
Measuring cylinder compression pressure to assess engine health. Compares each cylinder peak pressure to identify problems.
The rods connecting the pistons to the crankshaft. Stronger forged or billet rods are common in built engines for forced induction or high RPM.
A car with a fully retractable roof that converts the body from coupe configuration to fully open-air. Soft-top, hard-top, or retractable hard-top variants exist.
Removing old coolant and replacing it with fresh coolant. Required periodically to prevent corrosion and overheating.
A two-door car body style, typically with a sport-oriented design. Distinct from sedan (four-door) and hatchback (rear hatch).
A car driven regularly for everyday transportation, as distinct from a weekend, project, or show car. Often abbreviated DD.
Dual-clutch transmission. An automated manual transmission using two separate clutches for odd and even gears, allowing fast shifts.
A wheel design where the outer lip extends significantly outward from the barrel, creating a concave face profile with a pronounced outer lip.
Japanese decorated truck culture. Trucks fitted with elaborate chrome, neon lighting, and custom paint, originally for commercial use.
The most extreme variant of the Hellcat 6.2 supercharged HEMI V8. Demon (2018) and Demon 170 (2023) make 808 and 1,025 horsepower respectively.
A rear underbody aerodynamic surface that accelerates air leaving the underbody, creating low pressure and downforce at the rear.
A fuel delivery method that injects gasoline directly into the combustion chamber rather than the intake port, enabling higher compression ratios, better fuel economy, and more power per liter.
A 1971-1976 Chevrolet Caprice or Impala with extreme oversized wheels (24+ inches), often with massive lifts and elaborate paint. American sub-genre.
Aerodynamic force pressing a car downward at speed, increasing tire grip. Generated through wings, splitters, diffusers, and underbody design.
The exhaust pipe immediately after the turbocharger. Aftermarket downpipes reduce restriction and boost lag, often used with tunes.
A motorsport where two cars accelerate from a standing start over a quarter-mile or eighth-mile straight course. The fastest car wins.
A driving technique where the rear wheels exceed grip and slide laterally, with the driver controlling the slide through steering, throttle, and clutch.
A drift car built specifically for daily practice and abuse, often with cosmetic damage and minimal interior. The opposite of a show car drift build.
A high-performance composite manufacturing method that produces carbon fiber parts with a higher fiber-to-resin ratio than wet-layup carbon, resulting in stronger, lighter, and more expensive components.
An engine lubrication system that stores oil in a separate external tank rather than in a pan below the engine, allowing lower engine mounting, better oil control under cornering, and improved reliability under sustained hard driving.
A small lipped extension on the trailing edge of a trunk lid, named for its resemblance to a duck tail. Used on classic Porsche 911 RS variants.
A device that measures engine power output (horsepower and torque) by applying load to the wheels or crankshaft.
A fuel blend of 85% ethanol and 15% gasoline. Higher effective octane than gasoline. Common in performance tuning for additional power.
Modifying the engine control unit (ECU) software to optimize fuel, ignition, and boost parameters for more power.
European Domestic Market. Refers to vehicles, parts, and styling sold or used in Europe. Counterpart to JDM and USDM.
Auto racing where cars compete over long distances or times (typically 4-24 hours), prioritizing reliability and pace consistency over outright speed.
A body style with a continuously sloping rear roof line that extends to the trunk lid or rear hatch. Common in classic muscle cars and modern sport coupes.
Aftermarket extensions added to the wheel arches to accommodate wider wheels and tires than the original body would allow.
A calibration strategy that allows an engine to run optimally on any blend of gasoline and ethanol, automatically adjusting ignition timing, fuel delivery, and boost based on the ethanol content measured by a sensor.
The disc connecting the engine crankshaft to the clutch (in manual transmissions) or torque converter (in automatic). Lighter flywheels improve throttle response.
Engine pistons made by forging billet aluminum rather than casting molten aluminum into a mold. Stronger than cast pistons, used in high-performance builds.
The pinnacle of single-seater motorsport. Annual world championship for purpose-built open-wheel racing cars. Founded 1950.
Devices that inject fuel into the engine. Sized in pounds-per-hour or cc/min. Larger injectors required for higher horsepower applications.
Front-wheel drive. Power is delivered exclusively to the front wheels. Common in economy cars and the foundation for hot hatch culture.
A two-seat or 2+2 high-performance car designed for high-speed long-distance travel, balancing comfort and performance.
Trust Co., Ltd. - Japanese tuning company famous for turbochargers, intercoolers, intake manifolds, and the iconic Greddy Type-RS blow-off valve.
A large rear wing typically mounted on a separate platform above the trunk lid, designed for maximum downforce in track and racing applications.
A driving discipline where drivers navigate a tight course with specific maneuvers (donuts, slides, reverses). Made famous by Ken Block.
Japanese slang for the Toyota AE86. Means "eight-six" in Japanese. The car made famous by Initial D and the modern GR86 / BRZ revival.
Japanese term for street racer. Drivers who race on public roads at night, often associated with touge mountain pass driving.
A car body style with a rear hatch that opens to access the cargo area. Common in compact cars, hot hatches, and crossover designs.
An aftermarket exhaust manifold designed to optimize exhaust flow from the cylinder head to the rest of the exhaust system. Increases power.
The seal between the engine cylinder head and engine block. Critical for compression and coolant containment. Failure is a major engine repair.
A driving technique using the right foot to brake with the toe and blip the throttle with the heel during downshifts. Essential for fast manual driving.
Wheel fitment style where the wheel face sits flush with the fender lip. Origin of the broader stance movement.
The 6.2-liter supercharged HEMI V8 engine produced by Stellantis from 2015 to 2024. Power outputs from 707 to 807 horsepower across various Mopar applications.
American performance house founded 1991 by John Hennessey. Famous for Hennessey Venom GT and Venom F5 hypercars, and extreme tuning of various platforms.
Hasegawa Kotaro Specialist - Japanese tuning company founded 1973. Famous for turbocharger systems, exhausts, and the iconic SSQV blow-off valve.
A high-performance variant of a compact hatchback. The category began with the 1976 Volkswagen Golf GTI.
An older American car (typically pre-1949) modified for performance and individualistic style. The original DIY car culture.
A plastic or aluminum insert that fills the gap between a wheel's center bore and the vehicle's hub, ensuring the wheel centers on the hub rather than the lug bolts.
The most extreme tier of supercars, characterized by carbon fiber construction, 900+ horsepower, and prices typically over $1 million.
A carburetor-inspired induction system with a separate throttle body for each engine cylinder, providing instantaneous throttle response and a distinctive intake sound.
A heat exchanger that cools the air leaving a turbocharger or supercharger before entering the engine, increasing density and power.
A Japanese vehicle decorated with anime, manga, or video game characters and graphics. The term combines "itai" (painful) and "sha" (vehicle).
Japanese street racing subculture in Osaka, racing modified Honda Civics on the Kanjo highway loops. Active since the 1990s.
Japanese vehicle classification with strict size and engine displacement limits (currently 660cc maximum). Includes commuter cars, vans, trucks, and a sports segment.
Engine detonation outside of the normal combustion event. Causes pinging or knocking sound. Damages engine if sustained.
Swapping a Honda K-series engine (K20, K24, etc.) into a chassis that did not come with one originally. Most common in older Civic and CR-X chassis.
An electronic system that holds engine RPM at an optimal level for the fastest possible standing start, then releases for maximum acceleration.
A diagnostic test that measures cylinder air leakage by introducing pressurized air. Identifies the location of compression problems (rings, valves, head gasket).
Using the left foot for the brake pedal (instead of the typical right foot) to allow simultaneous throttle and brake input. Common in rally and AWD performance driving.
The 24 Hours of Le Mans. The most famous endurance race in the world, run annually since 1923 at Circuit de la Sarthe in France.
Japanese tuner house founded by Wataru Kato. Famous for aggressive bolt-on widebody kits with riveted flares for supercars and performance cars.
A locking differential that mechanically or electronically locks both wheels on an axle to spin together. Used in off-road and drag racing applications.
Stiffer, shorter replacement coil springs that reduce a vehicle's ride height, improving handling and aesthetics without the cost of a full coilover system.
A car modified with hydraulic or air suspension allowing dramatic ride height changes, often with elaborate paint and interior. Mexican-American cultural origin.
Limited-slip differential. A differential that distributes power between the left and right wheels to reduce wheel spin under acceleration.
Swapping a GM LS-series V8 into a chassis that did not originally have one. The universal V8 swap because the engines are cheap, light, and powerful.
Mass Air Flow sensor. Measures the mass of air entering the engine intake. Used by ECUs to calculate fuel injection quantities.
A transmission requiring driver operation of a clutch and gear lever. Increasingly rare in modern cars. The traditional driver-engagement option.
Manifold Absolute Pressure sensor. Measures pressure in the intake manifold. Used by ECUs to calculate boost levels and fueling.
A supplemental fuel system that sprays a fine mist of methanol or water-methanol mix into the intake charge, cooling the intake air and resisting knock on turbocharged engines running pump gas.
An engine layout where the engine is placed behind the driver and in front of the rear axle. Used in most modern supercars for optimal weight distribution.
Legendary Tokyo highway street racing club active 1987-1999. Strict rules, including 160 mph minimum top speed for membership. Disbanded after a fatal accident.
A vehicle structure where the body shell carries the load. The standard for most modern passenger cars. Lighter than body-on-frame but harder to repair.
The removal of one or more mufflers from a vehicle's exhaust system, increasing exhaust volume and altering tone, typically in exchange for a louder and more aggressive sound.
Honda factory tuning house and racing arm. Founded 1973 by Hirotoshi Honda (son of Soichiro Honda). Famous for Civic Type R Mugen, NSX-R, and racing engines.
An American mid-size or compact car with a large displacement V8 engine. The category began with the 1964 Pontiac GTO and peaked in the late 1960s and early 1970s.
National Association for Stock Car Auto Racing. American oval-track racing series, with the Cup Series as the premier division. Founded 1948.
An engine without forced induction (no turbo, no supercharger). Air enters the cylinders only through atmospheric pressure during the intake stroke.
Nissan in-house performance and motorsport division. Founded 1984. Produces high-performance Nissan variants and racing parts for Z, GT-R, Skyline, and other models.
A measure of fuel resistance to engine knock. Higher octane fuel resists knock better, allowing more aggressive ignition timing.
Original Equipment Manufacturer. Refers to factory parts made by the same manufacturer that supplied the original vehicle. Counterpart to aftermarket.
A modification style that uses factory or factory-style parts from higher trims or other models, keeping the car looking stock but with subtle improvements.
The mileage or time period between engine oil changes. Modern intervals are typically 5,000-15,000 miles depending on oil and conditions.
The steering input applied toward the outside of a turn to counter and control oversteer, commonly seen in drift and rally driving where the rear of the car slides outward.
A handling condition where the rear of the car steps out, often leading to a slide or spin. Common in RWD cars and the basis for drift.
Steering wheel-mounted controls allowing manual gear selection in cars with automatic or dual-clutch transmissions. Common in modern performance cars.
An auxiliary engine controller that modifies signals to or from the factory ECU rather than replacing it. Less powerful than standalone but cheaper.
An American sport coupe in the body style established by the 1964 Ford Mustang. Includes Camaro, Firebird, Barracuda, and Challenger.
The conventional fuel delivery method that sprays gasoline into the intake port before the intake valve, allowing fuel and air to mix before entering the combustion chamber.
A car show series dedicated exclusively to vehicles from the 1980s and 1990s, celebrating the era's distinctive styling and pop culture as enthusiast-worthy collectibles.
A motorsport format with competitive driving on closed sections of public road or off-road stages, with timed sections and varying surfaces.
The maximum safe RPM for an engine, marked in red on the tachometer. Exceeding redline can cause engine damage.
A braking system in electric and hybrid vehicles that converts kinetic energy back to electricity, charging the battery. Reduces brake wear.
A classic vehicle restored with modern mechanical updates (engine, suspension, brakes, electronics) while maintaining the original styling.
Raising engine RPM during downshifts to match the new gear ratio, allowing smooth clutch engagement. Either manual or automatic.
A pejorative car-culture term for a heavily modified vehicle, usually a Japanese sport compact, with showy mods but little real performance to match.
American restomod shop in Wisconsin, founded by Jim and Mike Ring. Famous for high-end muscle car restomods and bespoke Mustang and Camaro builds.
Japanese tuner house founded by Kei Miura. Famous for cleaner, cohesive widebody kits with bolt-on flares for sport cars and tuner cars.
A welded tubular structure inside a vehicle that protects occupants in case of a rollover or impact. Required for many forms of motorsport.
American Ford-focused tuner founded by Jack Roush in 1976. Specializes in Mustang performance variants, including supercharged Roush Mustangs.
German Porsche tuner and manufacturer founded 1939. Famous for extreme Porsche 911 modifications including the iconic Yellowbird CTR and BTR.
Rauh-Welt Begriff. Akira Nakai's iconic Japanese Porsche tuning house, famous for hand-built widebody 911s with riveted fender flares.
Rear-wheel drive. Power is delivered exclusively to the rear wheels. Common in performance cars and the foundation for drift culture.
American Ford-focused tuner and limited-production manufacturer founded 1983 by Steve Saleen. Famous for Saleen Mustangs and the S7 supercar.
A rally driving technique where the driver intentionally flicks the steering opposite of the corner direction before turning in, using weight transfer to rotate the car.
A four-door car body style with a separate trunk and seating for 4-5 passengers. The most common car body style globally.
The Specialty Equipment Market Association trade show held annually in Las Vegas, the largest automotive specialty parts and accessories event in the world and a major stage for custom car reveals.
Japanese term for "low car" - the original Japanese low-ride-height aesthetic that influenced global stance culture.
A two-door wagon body style, traditionally derived from luxury sport coupes. The Mercedes-AMG GT 4-Door Coupe is a modern interpretation.
Los Angeles-based Porsche restomod shop founded 2009 by Rob Dickinson. Famous for hand-finished 964 chassis builds with extreme attention to detail.
A vehicle lowered to the maximum extent possible, often touching or nearly touching the ground. Common in stance and lowrider culture.
A car that appears stock or unimpressive externally but has significant performance modifications. The opposite of a ricer or show build.
Devices that ignite the air-fuel mixture in gasoline engine cylinders. Different heat ranges suit different engine applications.
A horizontal aerodynamic surface mounted at the front of a car, creating downforce by separating the airflow above and below.
Japanese Honda tuner founded 1988 by Tatsuru Ichishima. Famous for racing-focused Civic and Integra builds, distinctive yellow-and-blue livery.
A wheel and tire configuration using wider rear wheels and tires than the front, common on rear-wheel-drive performance cars to optimize grip balance.
A modification style focused on aggressive ride height, wheel fitment, and camber, prioritizing aesthetic over function.
Annual stance car event series founded in 2010. The largest stance-focused car gathering in North America, with regional events globally.
A complete aftermarket engine management system replacing the factory ECU. Provides full programming flexibility for serious modifications.
Subaru Tecnica International. Subaru in-house performance and motorsport division. Famous for WRX STI variants and rally racing programs.
A separate structural component bolted to the main vehicle structure, typically supporting the engine, transmission, or suspension.
A high-performance two-seat sports car, typically mid-engine, with 500-700 horsepower and prices in the $200,000-$500,000 range.
A supercharger uses engine power (via a belt) to drive a compressor, forcing more air into the engine. Faster response than turbo but less efficient.
Anti-roll bar. A torsion bar connecting left and right suspension to reduce body roll during cornering.
Two cars drifting in close proximity, with the lead car setting the pace and the chase car following inches behind. Common in competitive drift.
A semi-convertible body style with a removable roof panel above the seats but a fixed rear roof or window. Originated by Porsche on the 911 in 1965.
A motorsport format where competitors aim for the fastest single lap on a closed circuit, with cars typically heavily modified for outright pace.
A rubber belt that synchronizes the camshaft with the crankshaft. Common in older engines. Replacement at specified intervals is critical.
A metal chain that synchronizes the camshaft with the crankshaft. More durable than belts, typically lasting the engine life with periodic inspection.
The chemical rubber mixture used in a tire's tread, determining its grip level, wear rate, and operating temperature range.
The degree to which the front or rear wheels point inward (toe-in) or outward (toe-out) when viewed from above, directly affecting tire wear, stability, and turn-in response.
Japanese mountain road driving, traditionally on tight winding passes. Origin of drift culture and many JDM driving traditions.
An event where amateur drivers can drive their cars on a closed racing circuit. Typically organized by clubs with safety briefings and run group structure.
Toyota Racing Development. Toyota in-house performance and motorsport division. Produces TRD-branded parts and complete performance variants.
A roof design with two removable panels separated by a center brace. Common in 1970s-80s American muscle and sport cars.
A turbocharger uses exhaust gas to spin a compressor, forcing more air into the engine. The result is significantly more power from the same displacement.
A turbocharger design that divides the exhaust housing into two separate scroll passages, pairing cylinders so exhaust pulses do not interfere with each other, improving spool speed and efficiency.
A two-stage rev limiter system. The first stage holds engine RPM at launch level; the second is the regular redline. Used for drag racing launches.
Honda performance designation for the most extreme variants of select models. The original NSX-R (1992), Integra Type R (1995), and Civic Type R lineage.
Setting the clearance between the valves and the camshaft (or rocker arm). Required periodically on engines with mechanical valve trains.
A technology that continuously or step-changes the timing of intake and exhaust valve opening events relative to crankshaft position, broadening an engine's power and torque delivery across the RPM range.
Japanese luxury sedan modification style with extreme low stance, oversized wheels, body kits, and premium interior work. Originated with Toyota Crown and Celsior.
Honda's Variable Valve Timing and Lift Electronic Control system, which switches between two cam profiles at a set RPM to optimize low-end torque and high-RPM power.
A car body style with extended cargo area behind the rear seats. Also called estate (UK) or station wagon. Practical alternative to SUVs.
A valve that diverts exhaust gas around the turbocharger turbine to control boost pressure. Internal (factory) or external (aftermarket race) variants.
The shift in vehicle weight between axles or sides during braking, acceleration, or cornering. The fundamental principle of vehicle dynamics.
The distance between the wheel mounting surface and the wheel center line. Determines how wheels sit relative to the fender and chassis.
Machined discs that mount between the wheel hub and wheel, pushing the wheel further outward to widen the vehicle's track.
Wide-range air-fuel ratio oxygen sensor. Provides precise AFR readings for tuning, replacing limited factory narrowband sensors.
A modification that adds wider fenders to a vehicle, accommodating wider wheels and tires than the original body would allow.
A wing creates aerodynamic downforce; a spoiler disrupts airflow to reduce lift. The terms are often used interchangeably but refer to different aerodynamic functions.