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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,564
There are two common ways to controll boost. Usual OEM approach is "bleed" approach where signal line to wastegate is bled off with pulse-width modulated valve and vent hose (if existing) is left as it is. This is stock way and used on all internal-wastegate cars (and I don't believe there are any externally-wastegated cars in production nowadays)

The other "bling" way is to leave signal line as it is (connected to plenum) and then regulate the boost by applying pressure trough wastegate vent hose...controlling the valve by differential pressure (also regulated by PWM bleed valve). This should in theory lessen boost creep. But you still cannot reduce boost below base spring-controlled boost.

It doesn't matter which approach he used. As soon as mechanically controlled spring-tension base boost is higher than EBC-configured boost, EBC is just dangling there without a posibility to do something about it.
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Old 06-23-2008, 02:45 PM
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