kweng84 said:
edwin: wat is SE muffler? sorry ar..
sam: It is ideal to have null backpressure..our aim is to minimize it as much as we can. Yeah, we cant get big diameter pipings for N/A cars as it will create restrictions along the exhaust pipes. Bigger pipings higher chances for the exhaust to cool down. Cold exhaust is heavy,thus, engine power loss to push out the heavy exhaust. Thats wat i understand bout restriction. if im wrong, pls teach me ya...
Dude, restriction is not about using bigger pipes, it is the number and how piping bent is shaped, the cat convertor, center bullet and end muffler that is normally refered to restriction.
u c, stock piping are small to enhance power at the low to mid range, normal people dont rev2 car mah, onli certain that is not that normal (like most of us).. piping size is more related to gas flow characteristic than restriction..
piping size in general will determine where ur power band is, as it is best to have laminar flow (optimum flowing speed)and that is where ur most efficient power is.. for a certain pipe size, if gas flow slower than optimum speed than it will flow in turbulence while exceeding optimum speed will cause it to become congested.. easier said, small pipe good for low end (normal driver), medium size good for mid range (casual sprinter) and big size for top end (hi revving craze)
Imagine drinking water using straw for instance to simulate the case.. water as exhaust, straw as piping and ur feeling of sucking as effect on engine/power..