A/R Ratio is the ratio of internal to brag isthmus exhaust determines speed of rotation of the exhaust turbine which affect kanbut with which to speed or slow. By changing the isthmus or A/R Ratio will cause the exhaust speed or slow vary according to the size of the isthmus. If the A/R Ratio is too high a large isthmus kanbut Turbo is slower but the heat accumulated in the cooling of the Turbo, the exhaust back pressure shall not be more. If the value is A small isthmus/R Ratio is too low, there will be a kanbut, but that quickly accumulated in the heat and high pressure Turbo back exhaust system more. Although there will be a response, but the engine is in the high.
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