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Old 11th August 2004
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Alex_Saab Alex_Saab is offline
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Default Bypass Valve Question

Is the stock Viggen Bypass valve comparable to aftermarket ones such as hyperboost or forge? Do the aftermarkets improve turbo response considerably over the stock viggen?
Finally do they produce a more audible noise?


Thanks.
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  #2  
Old 11th August 2004
Ragtop Fanatic Ragtop Fanatic is offline
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Is the stock Viggen Bypass valve comparable to aftermarket ones such as hyperboost or forge?

No, it is not rebuildable or adjustable.

Do the aftermarkets improve turbo response considerably over the stock viggen?

Not that I can tell with my Forge BPV

Finally do they produce a more audible noise?

No, not a BPV a BOV is another story, but don't try one with a T7.
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Old 11th August 2004
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SPATL SPATL is offline
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Comparable? Performance increases? not really anything to gain from a BPV. If any increase, it is very small. The viggen BPV will work just fine. There is probably a more audible note out of the metal afterarket BPV's. Only difference is that the viggen BPV is a diaphragm and can has the possibility of needing replacement whereas the metal piston style is servicable and will last the life of your car.
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Old 11th August 2004
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Alex_Saab Alex_Saab is offline
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Thanks guys
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