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SVTPerformance's Chain of Restaurants
The Blower Bistro
Need Help on wastegating a procharger - 2011 mustang gt
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<blockquote data-quote="MG0h3" data-source="post: 15513213" data-attributes="member: 164690"><p>I never ran braided to BOV or WG. You want a solid source for boost for the WG. On turbo systems I used the port right off the compressor or for you the supercharger. Boost gauge and BOV can share.</p><p></p><p>Try and clear this up because it will work for you:</p><p></p><p>The blow off valve only opens when the throttle closes when it sees vacuum. The purpose is to protect the impeller of the turbo/supercharger. You have all this air being rammed towards the throttle blade and through the engine, when the blade suddenly snaps shut when you let off the air needs to go somewhere...atmosphere. If all that air didnt get "blown off", it would act as a force against the impeller.</p><p></p><p>If you google some turbo vids you can hear the BOV "whoosh" or "chu chu chu" on ricers when they let off.</p><p></p><p>Wastegates were originally designed for turbo systems as mentioned. They didnt let out pressurized air but exhaust before it reached the turbo thus limiting the impeller speed. This part will open under pressure or boost. A large spring holds it closed and when it sees XYZ PSI the spring is overcome and the valve opens. Its not uncommon to get a 10psi spring and have to cut or shim it. Shimming the spring will require more boost to open it, cutting it will reduce it. </p><p></p><p>Just be sure to tell your tuner or if you are remote tuning about the wastegate and that you dont know what boost youll see. BE CAREFUL. My 10psi wastegate gave me 14psi.</p><p></p><p>Idle/cruise: BOV open and WG closed</p><p>Wide open throttle (WOT): BOV closes and boost starts rising</p><p>10 psi boost: WG opens and blows off air limiting boost to 10psi. If the WG isnt big enough, this is where youll see the boost still creep</p><p>End of pull/closed throttle: WG closes and BOV opens</p></blockquote><p></p>
[QUOTE="MG0h3, post: 15513213, member: 164690"] I never ran braided to BOV or WG. You want a solid source for boost for the WG. On turbo systems I used the port right off the compressor or for you the supercharger. Boost gauge and BOV can share. Try and clear this up because it will work for you: The blow off valve only opens when the throttle closes when it sees vacuum. The purpose is to protect the impeller of the turbo/supercharger. You have all this air being rammed towards the throttle blade and through the engine, when the blade suddenly snaps shut when you let off the air needs to go somewhere...atmosphere. If all that air didnt get "blown off", it would act as a force against the impeller. If you google some turbo vids you can hear the BOV "whoosh" or "chu chu chu" on ricers when they let off. Wastegates were originally designed for turbo systems as mentioned. They didnt let out pressurized air but exhaust before it reached the turbo thus limiting the impeller speed. This part will open under pressure or boost. A large spring holds it closed and when it sees XYZ PSI the spring is overcome and the valve opens. Its not uncommon to get a 10psi spring and have to cut or shim it. Shimming the spring will require more boost to open it, cutting it will reduce it. Just be sure to tell your tuner or if you are remote tuning about the wastegate and that you dont know what boost youll see. BE CAREFUL. My 10psi wastegate gave me 14psi. Idle/cruise: BOV open and WG closed Wide open throttle (WOT): BOV closes and boost starts rising 10 psi boost: WG opens and blows off air limiting boost to 10psi. If the WG isnt big enough, this is where youll see the boost still creep End of pull/closed throttle: WG closes and BOV opens [/QUOTE]
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Need Help on wastegating a procharger - 2011 mustang gt
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