How To Increase Back Pressure On Motorcycle Exhaust

Reduce the noise from wide-open exhaust pipes and create back-pressure in the exhaust system.

How to increase back pressure on motorcycle exhaust. The exhaust system creates a pulse through the exhaust manifold in four stages of combustion. However a little back pressure is a good thing. If not try to kick start the motorcycle.

Each exhaust system is designed with timed pulses. The right size pipe is large enough to breathe well but small enough to create a high exhaust flow. I suppose exhaust backpressure could have a similar unintuitive effect under some conditions.

The trick is to have a pipe that that is as narrow as possible while having as close to zero back pressure as possible at the RPM range you want your power band to be located at. If back pressure reduces your engines power and performance. There is a need in an engine for a reverse pressure sonic wave aka back pressure in most motorcycle conversations back to the exaust valve to actually push any unburned fresh intake mix back into the chamber.

In essence as said above an exhaust which has lower back pressure will allow more exhaust to exit and therefore more air into the cyl and usually the ECU will keep control of this on cruise. If that doesnt work put the motorcycle in 1st or 2nd gear push and move it while holding the clutch. Thus if your powerband is located 2-3000 RPM youd want a narrower pipe than if your powerband is located at 8-9000RPM.

A bimodal intake is great for helping low end torque. Active regeneration is triggered when the exhaust back-pressure across the DPF is sensed to have reached a first critical point whereupon the ECU initiates a fuel injection routine designed to increase the exhaust temperature in the DPF to over 600 C in order to oxidize the particulate deposits. However the best way is to weld or have an exhaust shop install O2 bungs in the pipe at the locations.

Well theres an easy solution for that. Limiting noise emission is not only considerate but is required by law in many localities. And the backpressure is generated by the lack of proper flow of the gas.