except to say please quote your sources of information when borrowing articles from other websites
http://www.indiacar.com/infobank/turbo.htmfirst off sorry about the bad grammer,, was doing course work at the same time.
now before you say (you kno it all lol) go back to basic's first, AND DO UR RESEARCH. Before you start speaking about things you are not sure on. (I take it you dont work arround Automobile's on a daily bases)
now read: Multiple valves and double-overhead camshaft designs developed reasonable performance without the complication of turbo-charging, and these methods were politically correct too since they consumed less fuel. Consequently today there are only a few petrol-powered road cars that still use turbo-chargers for enhanced performance.
Computers soon started playing an even bigger role in cars. Engine management systems linked to fuel-injection systems meant getting more out of the engine was even easier. For example, one can buy chips that can boost power by 100 bhp for some Japanese cars, such as the Nissan Skyline. Moreover, on-road speeds were being restricted all over the world. Though most of the sports cars today are capable of doing more, they are restricted electronically not to exceed 250 kmph even in autobahn-blessed Germany.
Turbo-charging lost its edge towards the end of the '80s and today this technology is used only in select performance cars. Porsche, for example, is all set to build a turbo-charged version of its all-new 911 (water-cooled) with added performance. Turbo engines were banned in Formula One too with the idea of restricting the performance of the cars (and thereby making them safer too). There are many who consider this a backward step in the world of Formula One, which is considered to represent the 'tomorrow' of automotive technology. But if one analyses the performance of normally aspirated cars in F1 today, (3,500 cc non-turbo), they perform as well, if not better, than the turbo cars of the early '80s.
So, there are no full stops in technology. While road cars and even sports and racing cars are going in for more efficient engines, better metallurgy and wilder-than-ever electronics to get their engines to perform at an optimum level without sacrificing the performance edge, turbo-chargers still continue to serve the same purpose they were invented for... albeit more so with diesel engines.
