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Old 01-11-2005, 12:35 PM
Y-TRY Y-TRY is offline
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Thanks. These are great ideas.

As I understand the Wastegates, they will only open when the manifold sees boost pressures higher than the spring rate. They are just along for the ride until they see 10psi (or whatever) then they open up. They dont open at all until then, and close as soon as the manifold sees less pressure. That way they let the boost build only to the max setting. Kinda on/off like a carb powervalve does.

I thought the BOV only senses surges. The SSQV actually senses sudden spikes in vacuum, signaling that the throttle has abruptly closed. Then it opens only briefly. (sounds like a passenger screaming "weeeooooo", pretty funny) I have not played with the adjustment screw. I'll do this next. What should I do there? Is there a way to loosen it up where it doesnt need such abrupt changes in vacuum to open? It'd be neat if I could make it operate when I ease off the throttle.

I don't think there is any sort of mid-throttle bypass valve like a centrifugal uses. The wastegates and BOV seem to be just hanging out until I'm operating in boost or getting out of boost suddenly.

I have the wastegate and the BOV ports all connected to actual manifold pressure, not the hat or turbo housings. We built a little "vacuum log" with several ports in it to feed all the parts needing vacuum signal, because there is only one port (tapped into the carb baseplate) for 8 or so components.

If I've got any of this wrong, let me know.
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