exhaust's control valve?
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 753
Likes: 0
exhaust's control valve?
with the new Zl1 cam , my 427 is even louder than with my previous l88 cam. I'm risking troubles with the police here due to hi sound level and sincerely I would like a quieter exhaust in round town riding and at engine start up
would this thing work?
http://www.summitracing.com/parts/APX-155-A019/
anything cheaper from other brands?
this the video of my car
2,5" system , 2,5" magnaflows
http://www.youtube.com/watch?v=k2D7cABytzg
would this thing work?
http://www.summitracing.com/parts/APX-155-A019/
anything cheaper from other brands?
this the video of my car
2,5" system , 2,5" magnaflows
http://www.youtube.com/watch?v=k2D7cABytzg
Last edited by elle88; Mar 16, 2010 at 02:48 AM.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
They're really intended for those wanting to run an open exhaust and have the option to divert the flow through a muffled system when needed. If you want to tone down the sound level, you'll need a muffler that fits that need or put these in your collectors: http://www.summitracing.com/parts/CCI-3DI25R/
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 753
Likes: 0
They're really intended for those wanting to run an open exhaust and have the option to divert the flow through a muffled system when needed. If you want to tone down the sound level, you'll need a muffler that fits that need or put these in your collectors: http://www.summitracing.com/parts/CCI-3DI25R/
but my intentions was to reduce the noise only when driving in town and i don't want to replace my magnaflows
the exhaust valves i talk about are not meant to divert the flow to the muffler or not (cutouts) but act about like the butterfly valves of the exhausts that the C6 z06 has, for example.
here is a video
http://www.youtube.com/watch?v=g366i...eature=related
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Is there any room under the car for a couple more small mufflers?
Something like these might work.
http://www.summitracing.com/parts/PYE-MVR200S/
Something like these might work.
http://www.summitracing.com/parts/PYE-MVR200S/
Team Owner
Joined: Jul 2004
Posts: 40,412
Likes: 792
From: Redondo Beach, California
The C6 exhaust system is an option on base engines. The base engine hp of 430 is increased to 436 with this exhaust. My C6 has four exhaust pipes. Two, the outer two I think, exhaust gas when exhaust flow is through the mufflers. The inner two flow exhaust when the mufflers are bypassed. When the mufflers are bypassed, the catalytic converters do provide some muffling action. These exhaust system is all stainless steel. Engine vacuum is used to actuate the butterfly valves.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I installed a 4 inch dia oval between my three inch duals and it is quiet until you put your gas petal on the floor.
Last edited by gkull; Mar 18, 2010 at 11:30 AM.
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
Like mentioned above, the valve is primarily designed to divert exhaust gas either to an open pipe (better for WOT power), or through a muffled exhaust system for quiet city cruising.
Of course you can choose how to divert your own exhaust, but if the existing Magnaflow mufflers are not quiet enough, you will need additional noise suppressors to achieve that. There isn't that much room under the car for additional mufflers. Then there is the weight penalty of additional hardware, and the resultant power loss by restricting the exhaust more.
Your best option is to replace the existing mufflers with ones that are quieter, like the reverse flow Turbo mufflers. But they do drop power.
If you incorporate the exhaust valve in the system, you can have it setup to direct exhaust through the muffled system when in the city, and then direct it through to open side pipes when you want to wake the dead under full throttle
Best option in my opinion.
One thing to consider though, is change in AFR (carby tune) under the 2 different modes. The modern cars have a computer to make fine tuning changes in real time... whereas with your engine you will need to make a compromise in tune to accomodate both exhaust modes.
I like the idea of a dual mode exhaust...
Of course you can choose how to divert your own exhaust, but if the existing Magnaflow mufflers are not quiet enough, you will need additional noise suppressors to achieve that. There isn't that much room under the car for additional mufflers. Then there is the weight penalty of additional hardware, and the resultant power loss by restricting the exhaust more.
Your best option is to replace the existing mufflers with ones that are quieter, like the reverse flow Turbo mufflers. But they do drop power.
If you incorporate the exhaust valve in the system, you can have it setup to direct exhaust through the muffled system when in the city, and then direct it through to open side pipes when you want to wake the dead under full throttle
Best option in my opinion.One thing to consider though, is change in AFR (carby tune) under the 2 different modes. The modern cars have a computer to make fine tuning changes in real time... whereas with your engine you will need to make a compromise in tune to accomodate both exhaust modes.
I like the idea of a dual mode exhaust...
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 753
Likes: 0
thanks for the inputs
sincerely I wanted an easy fix , without replacing mufflers and so on...
so do you think this will not work?
http://cgi.ebay.co.uk/Electric-Exhau...item439d8fea75
it's in UK and I could receive it in few days. basically it works as an exhausts variable restriction (not an exhaust's diverter-cutout)
i found this video
http://www.youtube.com/watch?v=jMcHI...eature=related
the valve seems to reduce mainly the low tones of the exhausts
sincerely I wanted an easy fix , without replacing mufflers and so on...
so do you think this will not work?
http://cgi.ebay.co.uk/Electric-Exhau...item439d8fea75
it's in UK and I could receive it in few days. basically it works as an exhausts variable restriction (not an exhaust's diverter-cutout)
i found this video
http://www.youtube.com/watch?v=jMcHI...eature=related
the valve seems to reduce mainly the low tones of the exhausts
Last edited by elle88; Mar 17, 2010 at 12:01 PM.
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Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 753
Likes: 0
If you want to tone down the sound level, you'll need a muffler that fits that need or put these in your collectors: http://www.summitracing.com/parts/CCI-3DI25R/
bought yesterday a pair car chemistry exhaust's inserts.
need some advises.
of course they are restrictive , but need to quiet down the engine. i think i'll cut away 1 of the 3 baffles and so use 2 only. but where to place the insert? CC says best place for noise reduction is immediately after the collectors, but i suppose that this is the worst place for an exhausts restriction. the easiest place for me would be immediately before mufflers : i suppose there the gases pressure would be somewhat reduced so less backpressure. am i wrong?
Melting Slicks
Joined: Feb 2001
Posts: 2,608
Likes: 3
From: TEXAS - you mean there are other states?
I have a 69 427 with SS factory side exhausts. It is very loud.
I saw the Summit valve and it states:
These ECVs from A'PEXi were created as alternatives to the standard silencers typically fitted in the tips of performance exhaust systems to lower the sound output. The ECVs (Exhaust Control Valve) are spring-loaded butterfly valves that can be installed to the main piping of an existing exhaust system. The angle of the valves can be modified on the fly from within the cockpit to provide complete control over exhaust decibel output
But - the casing does not look very substantial. The manual operation could be a good thing... ?
I did find these:
http://autospeed.com/cms/title_Pure-...3/article.html
They are SS flap with a cast alloy housing - vaccum operated. They open to 90 degress and will never fully close for safety.
I was looking for more of a diverter valve... but also thinking that even if well designed, turbulance may still be an issue. ....and - how much 'bypass' pipe and muffler could I route and still tie back into the factory side exhaust.
The other alternative would be dual exhaust out the back and still maintain the factory side exhausts - but I still cannot come to grips with that - kinda cheesy.
I wonder what the true reduction in performance would be for a carbureted, hydraulic roller cammed 427 (505hp). Would you really see any performance issues if you wanted to putt around instead with the capability of listening to some tunes.
I saw the Summit valve and it states:
These ECVs from A'PEXi were created as alternatives to the standard silencers typically fitted in the tips of performance exhaust systems to lower the sound output. The ECVs (Exhaust Control Valve) are spring-loaded butterfly valves that can be installed to the main piping of an existing exhaust system. The angle of the valves can be modified on the fly from within the cockpit to provide complete control over exhaust decibel output
But - the casing does not look very substantial. The manual operation could be a good thing... ?
I did find these:
http://autospeed.com/cms/title_Pure-...3/article.html
They are SS flap with a cast alloy housing - vaccum operated. They open to 90 degress and will never fully close for safety.
I was looking for more of a diverter valve... but also thinking that even if well designed, turbulance may still be an issue. ....and - how much 'bypass' pipe and muffler could I route and still tie back into the factory side exhaust.
The other alternative would be dual exhaust out the back and still maintain the factory side exhausts - but I still cannot come to grips with that - kinda cheesy.
I wonder what the true reduction in performance would be for a carbureted, hydraulic roller cammed 427 (505hp). Would you really see any performance issues if you wanted to putt around instead with the capability of listening to some tunes.
Last edited by kaiserbud; Apr 1, 2011 at 06:28 PM.
