HomemadeTurbo - DIY Turbo Forum - BOV not sounding @ idle

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Re:BOV not sounding @ idle

yup.
It depends on the size of the turbo and also how you tight you put the spring on the BOV

Re:BOV not sounding @ idle

Quote:

Originally Posted by AbaZ

If there is no load on the engine, you will hardly hear the bov at idle.

That's one thing I've never understood. How does load make a difference? The turbo works off the velocity of air coming out of the exhaust manifold, so how is airflow at 4000rpm at idle different than the airflow at 4000rpm in gear? I would think the same amount of air is coming through the exhaust regardless of load. I'm probably way off but I don't understand how it's any different.