diverter valve?

[Muertoloco]

Has anyone used one of these before, they are on german turbo cars and seem to work like a blow off valve except they recycle the air back into the air intake system before the turbo.

[Murphy]

I think they are called recirculation valves. Same thing as a BOV, the DSM BOV works this way. You can use it, but I dont think they really gain you anything. Most cars use them because of their fuel management system, and releasing that air to the atmosphere would confuse the ECU

there is a diverter valve people use. Basically a large one way check valve that goes between the intercooler and throttle body. When you are not in boost, it alws you to grab ambient air through the diverter valve without having to go through the turbo and intercooler. Once there is boost in the pipes, the valve closes. Helps off-boost power, which helps the turbo spool quicker.

[Dusty_Duster]

Has anyone used one of these before, they are on german turbo cars and seem to work like a blow off valve except they recycle the air back into the air intake system before the turbo.

This is only necessary on vehicles that use Mass-Airflow (MAF) sensors. Our vehicles use Manifold Absolute Pressure (MAP) sensors, so a recirculating compressor bypass valve is unnecessary.

there is a diverter valve people use. Basically a large one way check valve that goes between the intercooler and throttle body. When you are not in boost, it alws you to grab ambient air through the diverter valve without having to go through the turbo and intercooler. Once there is boost in the pipes, the valve closes. Helps off-boost power, which helps the turbo spool quicker.

Properly tuning your car eliminates the need for the D-valve you speak of, which is why no one uses them.