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A blow off valve is a device that releases pressure from the turbocharger when the throttle is released. It ensures that the pressure shock load on the turbocharger compressor is minimized and encourages the turbocharger rotating group to continue spinning during gear changes. APS designed the APS high volume twin vent blow off valve specifically for the Lancer Evo in tuned form.
The large primary vent is designed to plumb back into the inlet tract and ensures the best driveability during cruise conditions. More importantly, the APS BOV cures the problems seen with after market 100% external venting blow off valves. And under spirited driving conditions with the turbocharger running high boost pressure levels, the APS twin vent blow off valve continues to vent through to the second stage port in order to expel the maximum amount of charge air possible.
Fine adjustment to blow off valve operation can be performed through the actuation adjustment screw for optimum configuration.
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