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[QUOTE="Stroked777, post: 1063270, member: 10884"] In the gasser world it does work to help reduce lag because when the throttle plate closes the pressure builts between the turbo and throttle plate, basically it build inside the intercooler. If it wasn't for the BOV it would surge the turbo. They tune the BOV to open to dump just enough air to keep the turbo from surging, but hold enough "charged air" to have positive manifold pressure. But in a diesel there is no throttle plate so the air just continues through cylinder until the boost pressure is gone. With a BOV your just wasting the boost and then starting over. If tuned right you can keep the boost up between shifts and that will help you. With my 6.4 I know the kem tunes would drop Rpms quick after letting off the pedal causing the surge but with my gh tunes the rpm comes down more gradually and doesn't surge, after letting off my throttle completely it actually takes a few seconds to come down to 0 psi. Sorry it this seems confusing. Trying to explain the best I can [/QUOTE]
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