After reaching maximum speed, a noise known as turbo flutter will result if you take your foot off the accelerator. The noise may be conspicuous, but it normally doesn't damage the engine. Understanding what can cause turbo flutter on a diesel, how to do it, and get rid of it puts the decision in your hands of whether you want it to continue.

The Blow-Off Valve

A blow-off valve, or a bypass valve, is a part of turbochargers' pressure relief systems. Its job is to relieve the pressure of the compressed air that wants to exit the turbocharger, known as compressor surge, so it doesn't harm the turbine blades.

Pressurized air attempts to escape via the compressor when the throttle valve closes (for example, while letting off the gas pedal). If the air continued to flow backward, the turbocharger's blades would spin too fast and break. The blow-off valve opens quickly under pressure to prevent damage to the turbocharger.

Making Your Turbo Flutter

Removing the blow-off valve is the simplest technique to induce turbo flutter in a turbocharged engine. This will prevent air intake from escaping through smooth surfaces, resulting in the gratifying sounds we all know and love.

However, with a modified blow-off valve, turbo flutter may become widespread. This happens when the blow-off valve isn't functioning correctly, and the turbocharger's intake air has nowhere to go. Turbo flutter occurs when the air cannot escape the turbocharger and returns to it.

Fixing the Flutter

If you don't like turbo flutter and prefer a quiet, smooth-running engine, don't replace your conventional blow-off valve with a noise-canceling version.

Another option is to ensure a steady stream of air enters the turbocharger. Increasing the size of the intake pipe or clearing the air route of any obstacles can help, as will employing a new design for the turbine blades.

Turbo flutter may occur in any design, although some are more resistant than others. You can fine-tune the engine for a somewhat leaner operation. This will decrease the flutter by reducing the airflow through the turbocharger.

After learning what can cause turbo flutter on a diesel, you may want to explore the Ford 6.0 performance upgrades for your Powerstroke from Blessed Performance. Whether you want to keep it rumbling or mute it, we have what you need to make your wishes come true.