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Old 12-13-2011, 02:01 PM   #12
14 Years with the E30
InfiniteDice's Avatar
Join Date: Sep 2006
Location: St. Catharines
Posts: 1,152
Yeah I figured it would release the vacuum at some point, it can't just build vacuum indefinitely.

On some cars you'll see the one line coming off the brake booster, it then divides into two lines... one goes to an open port on the throttle body on the intake side of the TB and plugs into the air boot before the TB. The other line dead ends at a closed off throttle body port.

My system has the one line. Coming from the brake booster it goes into the one way valve, then into a plastic connector, from there the plastic connector plugs into the rubber intake boot and goes to a small port on the TB.

I'm not familiar with the logic of this routing. Why does the booster release air in front and in behind the TB at the same time? I've read that the engine vacuum is what opens the valve, but if that's true then why can I blow through it so easily?

Perhaps the engine vacuum counteracts the air coming from the booster to prohibit the flow from the booster, but since it's one way it can't actually supply air to the booster.

Okay I need a coffee.

Performance one step at a time.

Last edited by InfiniteDice; 12-13-2011 at 02:07 PM.
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