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I had a few emails about my pop-off valve so I figured I'd share with everyone. A pop-off valve is used to eliminate boost spike/creep. The valve opens up at a preset pressure to vent excess boost from your intake manifold and prevent overboost. It isn't meant to replace your wastegate, it's only a saftey measure. I took some pictures just now, bare in mind it was dark outside.
http://dev.audiogalaxy.com/~ryan/car...ff%20valve.jpg
http://dev.audiogalaxy.com/~ryan/car...f%20valve2.jpg
http://dev.audiogalaxy.com/~ryan/car...f%20valve3.jpg
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Ryan Earl
'99 Turbo SH
NTPOG - North Texas Prelude Owners Group
My Page
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Being nitpicky, the wastegate is supposed to prevent boost spike/creep. The pop-off value aka blow-off valve opens when the throttle plate closes to release the pressure building up between the compressor and the throttle body. If you're getting boost creep, your wastegate isn't doing its job.
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A blow-off valve and pop-off valve are completely different. Most people have never even heard of them. It's one of those things like the J&S when I got it over a year ago: extremely badass at saving engines but almost no one knows about it.
Here a cut'n'paste I replied else where:
It isn't like a blow-off valve. A blow-off valve uses pressure from the intake manifold to keep it shut, and opens up when there is more pressure at the blow-off valve than in the intake manifold. The pop-off valve has no vacuum lines run to it. It uses a spring to actuate the valve's opening. You tighten and loosen the spring to choose at what pressure the valve opens. It'll bleed off all pressure over X amount of boost where the blow-off valve bleeds off all pressure over the amount in the intake manifold.
Yes, it's installed on my intake manifold opposite the throttle body.
Blow-off valve protects your turbo, pop-off valve protects your engine, wastegate protects both and regulates boost.
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Ryan Earl
'99 Turbo SH
NTPOG - North Texas Prelude Owners Group
My Page
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so you'd set it at say 2-3 psi higher than what your wastegate/boost controller limit is set at .. and JUST in case it spikes or your wastegate craps out .. the pop off valve will open up and leak that boost out .. therefore saving your motor ..
is that how it works? if so then that is some good insurance ... question is .. does it reset itself after it "pops off"?
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Yeah, that's exactly how it works. You'd set it right at max boost, maybe a tad under so it opens a little in anticipation. It's a valve, it opens under pressure and closes when there isn't enough so it "resets."
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Ryan Earl
'99 Turbo SH
NTPOG - North Texas Prelude Owners Group
My Page
