What's up guys and gals, just wanted to ask you a quick question. My buddy told me that an exhaust system such as HKS will actually make me lose torque because of the flow of exhuast being more free and not as much back pressure. was wondering if this was true or not. thanks!

 

Backpressure is always bad. What you want in a system is 0 backpressure and high velocity. If you can keep the exhaust speed up you will get better scavenging and more power though out the range. Overly large piping will kill torque because you loose velocity, not backpressure, so piping should be sized to get you the highest velocity without sacrificing flow.

Most but not all of the systems designed for the Z actually increase torque or at the very least holds on to what came from the factory.

Chris

 

Thanks for the info

 

Building apon what Hypersprite said

Backpressure is the restriction of the exhaust gases that are produced by your engine while they are being released through your exhaust system

With restriction present, backpressure is developed, making the engine work much harder to release the exhaust out of the engine cylinders.


You need to have the least amount of backpressure possible to produce maximum power. Too large of diameter exhaust will cause a power loss and loss of low end torque because a larger pipe has less exhaust stream velocity than a smaller pipe. If the exhaust pipe is too large, then the exhaust flow will be slowed with less velocity.

During the exhaust stroke, a good way for an engine to lose power is through back pressure. The exhaust valve opens at the beginning of the exhaust stroke, and then the piston pushes the exhaust gases out of the cylinder. If there is any amount of resistance that the piston has to push against to force the exhaust gases out, power is wasted. Using two exhaust valves rather than one improves the flow by making the hole that the exhaust gases travel through larger.


Later
Aceman