Back pressure exhaust explained


Turbochargers allow an engine to burn more fuel and air by packing more into the existing cylinders. The typical boost provided by a turbocharger is 6 to 8 pounds per square inch (psi). Since normal atmospheric pressure is 14.7 psi at sea level, you can see that you are getting about 50 percent more air into the engine. Cat-back exhaust systems will include any pipes that run from the catalytic converter to the muffler, the muffler itself, any pipes that may run from the muffler to the exhaust tips, and the exhaust tips themselves. Some cat-back exhaust systems have a muffler delete, which means no muffler is included. (The same happens in reverse to retract the cylinder, because air pressure is holding the cylinder extended until the valve shifts back to its original position.) Note that of the three load factors, exhaust preload is the only one the designer can control — and he or she can do that with a dual-pressure circuit. Exhaust scavenging makes an exhaust system more efficient because as your exhaust gases pulse out of the engine (from each exhaust stroke of the engine), you have a high pressure area leading the exhaust pulse, followed by a low pressure area (with a transition). Exhaust systems are responsible for the disposal of exhaust gas created after engine combustion. Backpressure does not benefit engine performance as it returns exhaust into the engine cylinders instead of releasing it through the tailpipe. Backpressure can lessen fuel efficiency, reduce power and stall the engine. It can cause exhaust to either not be fully expelled from the cylinder or to flow back into the cylinder because of the large amount of pressure. This causes the cylinder charge to have less new combustion air in it. Hurts flow and power. Also robs your engine of power because the engine must pump harder to push out against the pressure. The OEM Exhaust Back Pressure Tester/Gauge allows user to test exhaust back pressure thru oxygen sensor. The oxygen sensor adapter is M12 & M18 thread and features a 2-1/2" easy to read gauge. The gauge has two multi colored bands to test idle and 2500RPM. Pressure is shown in PSA and bar