JDMteam

Japanese Domestic Market (JDM) is a term for Japan's economic market for Japanese-brand goods, such as automobiles and parts. The term's most common application is to Japanese-brand automobiles built specifically for the Japanese market (designed and constructed to conform to Japanese vehicle and equipment regulations and to suit Japanese market preferences). JDM vehicles migrate to other markets through ordinary commerce and the grey market.

JDM cars have been historically limited by a gentlemen's agreement among manufacturers to 280 horsepower (PS) (276 hp) and a top speed of 180 or 190 km/h, mostly due to safety concerns. The horsepower limit was lifted in 2004. However, the speed limit of 180 or 190 km/h remains in effect, depending on the make and model of vehicle. Many JDM sports cars have speedometers that only go up to 180 km/h, even though the car would be capable of much higher speeds if not for the built-in limiter. Some cars, such as the Nissan GT-R, detect via GPS whether the car is on a Japanese race track. If so, the speed limiter is disabled.

JDM vehicles often differ in features and equipment from vehicles sold elsewhere. For example, Honda has produced many different versions of the B18C 1, B16A and K20A engines for various markets worldwide. This is done due to varying emission regulations in different countries.

Vehicles built to JDM specifications may have stiffer suspensions and improved throttle response over vehicles built for different markets, due to differing driving styles and different road types. For example, the USA features long highways where a smoother ride would be preferable, while Japan's roads are short and twisty, where a stiffer suspension is desired for improved handling capability. For the US and European market versions, some features may be removed in order to stay below a certain pricing goal for the car, such as using a conventional rear suspension instead of a double wishbone suspension and lack of electronic devices like Active Yaw Control. Furthermore, engine power of JDM sports cars is sometimes reduced because of stricter emission standards in other countries.

Πηγή: http://en.wikipedia.org/wiki/Japanese_domestic_market