How to Compensate for Low-End Torque Loss Due to Exhaust?

[StKaylee]

Currently, the popular valve exhaust system is a straightforward solution. It involves installing an adjustable valve in the exhaust pipe to control exhaust backpressure by opening or closing the valve, thereby compensating for low-end torque loss. Additional Information: 1. Passive Valve: A passive valve does not require an additional power source to operate and is typically installed inside the muffler or on the connecting pipe between the mid and rear sections. It mainly consists of a spring and a flap. When the engine speed is low, the exhaust flow is insufficient to overcome the spring tension and lift the flap, causing the exhaust pipe to be blocked by the flap, thereby increasing backpressure. At high engine speeds, the exhaust flow is strong enough to lift the flap, fully opening the exhaust pipe and reducing backpressure, ensuring optimal engine power output. 2. Active Valve: An active valve requires an additional power source to operate and is usually installed on the tailpipe. Depending on the driving mechanism, it can be categorized as either an electric valve or a pneumatic valve. The electric valve is driven by a motor, while the pneumatic valve is driven by a vacuum pump. Similar to the passive valve, the active valve closes at low engine speeds to increase backpressure and opens at high speeds to reduce backpressure. Compared to passive valves, active valves provide lower backpressure at high speeds because the energy to open the valve is supplied by the battery, avoiding engine power loss. In contrast, passive valves require a small amount of engine power to overcome the spring tension, though this energy consumption is negligible.