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When engine performance is the main concern, the exhaust pipes and muffler should be large enough to facilitate breathing as well as small enough to create a high exhaust flow. [7] The objective of a muffled high-performance exhaust system depends on two independent factors: "the pressure wave tuning from length/diameter selection, and ...
The Turbo-back (or turbo back) is part of the exhaust system from the outlet of a turbocharger to the final vent to open air. Turbo-back systems are generally produced as aftermarket performance systems for cars with turbochargers. Some turbo-back (and header-back) systems replace stock catalytic converters, while others have less flow restriction.
A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.
The high pressure gas exiting the cylinder initially flows in the form of a "wavefront" as all disturbances in fluids do. The exhaust gas pushes its way into the pipe which is already occupied by gas from previous cycles, pushing that gas ahead and causing a wave front. Once the gas flow stops, the wave continues, passing the energy to the next ...
When the exhaust valve opens, the high pressure exhaust gas escapes into the exhaust manifold or header, creating an "exhaust pulse" comprising three main parts: The high-pressure head is created by the large pressure difference between the exhaust in the combustion chamber and the atmospheric pressure outside of the exhaust system
This lower flow but slightly quieter design approach is commonly used in glasspack mufflers. Some modern muffler designs are similar in principle to the glasspack, but use more sophisticated sound-absorbing materials such as stainless steel mesh, and more advanced acoustic engineering, reducing noise while retaining the power-preserving ...
Performance modifications by RacingLine bring the Jetta GLI Performance concept’s output to 350 hp and 372 pound-feet of torque—up from the stock model's 228 hp and 258 pound-feet.
Manifolds with sharp turns force the air–fuel mix to separate at high velocities because fuel is denser than air. The larger bore may extend through the exhaust system using large-diameter piping and low back pressure mufflers, and through the intake system with larger diameter airboxes and high-flow, high-efficiency air filters. Muffler ...