How to Solve CGW Exhaust Resonance?
1 Answers
To eliminate resonance, you can replace the original muffler and change both the mid and tail sections, using a silent muffler. Generally, the cause of resonance is that the muffler is too large, leading to insufficient exhaust flow, which results in turbulent exhaust gas inside the muffler. This turbulence impacts the edges of the muffler, causing the exhaust pipe to vibrate and subsequently leading to vehicle-wide resonance. The specific solutions are as follows: 1. Modify the muffler: For exhaust pipe resonance, you can change the muffler to a single-stage backpressure type and place steel wool inside the muffler. After this modification, the muffler's vibration frequency will change from vibrating three times per exhaust cycle to vibrating once. Additionally, the steel wool can absorb some of the exhaust energy, but its vibrations won't transfer to the muffler shell, significantly reducing the shell's vibrations compared to before the modification. 2. Exhaust resonance generally falls into three categories: The first is low-frequency resonance, which occurs at idle and below 2000 RPM. This is mainly caused by an improperly designed backpressure muffler that doesn't match the engine's RPM or issues with the flexible connection point in the header. The second is high-frequency resonance, which occurs above 2000 RPM or 3500 RPM, increasing with higher RPMs. This is usually due to poor car sound insulation, overly stiff vibration-damping hangers, thin exhaust pipe materials, or rough internal surfaces of the exhaust pipe. The third is hard connection resonance, which exists at all RPMs. This is typically caused by improper installation, where rigid connection points exist beyond the hangers, often seen in mismatched aftermarket exhaust systems.
