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I'm new to the turbo scene and after going over the On3performance directions I have a wuestion regarding the vacuum lines needed for the wastegate and blowoff valve. What are these needed for?
 

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on the BOV the vacuum line is to relieve the excess boost left in the charge pipe. When you let off the throttle your engine creates vacuum which pulls on the diaphram of the BOV, opening the valve which relieves the pressure.
 

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The wastegate has to see how much boost the intake is seeing in order to control or limit the boost. If you have no vacuum line to the wastegate, it will never open and if it doesn't open the turbo will make an excessive amount of boost- there will be no control. . What spring you put in the WG will determine how much boost you make. But the WG has to know how much boost the intake is seeing in order to operate correctly. You can also use the same vacuum port on the WG to add a manual boost controller or electronic boost controller to raise the boost level above what the spring is rated for. If you have a 9# spring in your WG you can add boost by creating a differential in the vacuum line. If you turn up the boost on a manual boost controller it creates this differential. Instead of the WG seeing 9# of boost and relieving exhaust gas, it may think its seeing 7# while you are actually making 12.

The BOV has to see boost in order relieve the pressure in the intake when you let off the throttle. If it doesn't see boost it will remain open continuously blowing off pressure in the charge pipe.
 

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Don't mean to jack your thread but at the moment im putting the wastegate together and was wondering if anyone has a picture of the one installed Thanks
 
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