? about stock C6 Z06 catback
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From: Elkhorn, WI
? about stock C6 Z06 catback My question is does the stock catback have some sort of setup where the exhaust system opens up somehow during wide open throttle. I have heard that there is a vacuum type setup that makes the exhaust more free flowing under WOT and if this is true could someone explain it to me or lead me in the correct direction. Thanks for your help in advance.
Yes, the stock Z06 exhaust has a vacuum operated butterfly valve. It opens and routes the exhaust directly into the exhaust tips, allowing most of the exhaust to by pass the going through muffler. It will open above 3500 rpm at WOT, but aftermarket controllers allow you to change that as well as leave it open or closed all the time.
It is also an option for the C6 known as "NPP" (factory option code). Adds 6 HP per GM over the stock exhaust.
It is also an option for the C6 known as "NPP" (factory option code). Adds 6 HP per GM over the stock exhaust.
Thread Starter
Teching In
Joined: Apr 2008
Posts: 4
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From: Elkhorn, WI
Yes, the stock Z06 exhaust has a vacuum operated butterfly valve. It opens and routes the exhaust directly into the exhaust tips, allowing most of the exhaust to by pass the going through muffler. It will open above 3500 rpm at WOT, but aftermarket controllers allow you to change that as well as leave it open or closed all the time.
It is also an option for the C6 known as "NPP" (factory option code). Adds 6 HP per GM over the stock exhaust.
It is also an option for the C6 known as "NPP" (factory option code). Adds 6 HP per GM over the stock exhaust.
Thread Starter
Teching In
Joined: Apr 2008
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From: Elkhorn, WI
I am seeking this information for a supercharged car that is not a Corvette so back pressure is needed and leaving it open all the time would be pointless of the whole project for me. What I still really would like to know is if the butterfly valve is connected to the PCM?
I am seeking this information for a supercharged car that is not a Corvette so back pressure is needed and leaving it open all the time would be pointless of the whole project for me.
Thread Starter
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From: Elkhorn, WI
I will be testing this out next spring then. The reason I need backpressure is because my engine is only 122ci four cylinder. I will loose substantial low end power with a wide open exhaust so I am trying to have the best of both worlds here by having good low end power and good high end power.
