Quote:
|
Backpressure in an exhaust system is never needed,
|
WOAH WOAH WOAH!!! wait a minute. in order for best efficiency or best power, a balance of back pressure vs. exhaust flow is needed.
Exhaust comes in pulses.
Quote:
|
(team integra) To understand how to properly tune an exhaust you must first understand exactly how the gasses will be flowing through it. Exhaust gasses do not flow in one continuous stream they get shot out in pulses. Each time a valve opens and gas is pushed out of the combustion chamber, it creates a pulse. As you can see from the picture, the head of the exhaust pulse remains at a high pressure after it is shoved out of the combustion chamber. The center of the pulse is closer to the ambient pressure of the exhaust system and the tail turns into a low pressure vacuum.
|
Quote:
|
Now look at these exhaust pulses all lined up as they travel through the exhaust. This would be an exhaust system which was sized perfectly for the car at the right RPM. The pulses, to an extent, will move through the B-pipe to the muffler by themselves. But we want the exhaust gasses to travel as fast as they possibly can. How can we get them moving faster? Well you get them to line up like shown, and the pulses will then pull each other through. As with most naturally occurring phenomenon, opposites will attract. The high pressure heads are pulled into the low pressure, almost vacuum-like tails. So each pulse will follow after the other, effectively leading each other to the muffler and away from the engine.
|
too much back pressure equals a restrictive exhaust system.
Here is a correctly sized exhaust system. just the right amount of back pressure.
INCORRECT EXHAUST PIPING!!!! Too large and even though it is "unrestricted" It restricts itself from the lack of back pressure. If you want unrestricted, might as well go with no pipes at all.
I'm not baggin' on ya, I just don't wanna give out the wrong idea. Your right that most pipes are usually crush bent, which is way too restrictive. but back pressure is essential to an exhaust. otherwise you'd just go with no pipes at all.
Heres' the full article
Team Integra-Exhaust Basics