Interesting Idea...
Drifting
Joined: Feb 2008
Posts: 1,682
Likes: 3
From: Coatesville PA
So after a little homework, a company called Varex makes dual mode mufflers operated by a controller on the muffler itself and a remote, pluging to engine or anything which is perfect... AND THEY ARE ONLY AVAILABLE IN AUSTRALIA!!!
Thread Starter
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Really simple but dumb idea... that probably isnt so simple so bear with me. If you had a dual exit exhaust like magnaflow or most of the rest, one of the pipes that exits the muffler, or even inside the tip, if you stuck a small bolt through it, then welded a circle "valve" almost the size of the muffler tubing to it then wouldnt the exhaust gas be enough to push it open depending on how much throttle was applied? Obviously the difficult part would be to have the circle weigh just enough so that >2000 or so rpms was not enough pressure for the exhaust gas to just blow it open, but rather just barely get past it. Then for it to weigh just enough that past those rpms the constant exhaust flow would be enough to keep it wide open. The flow would be pretty erratic but by that point its in the muffler tips so it wouldnt matter. Sorry if nobody understands that that was a horrible explination.
Le Mans Master
Joined: Oct 2007
Posts: 9,682
Likes: 3,434
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
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St. Jude Donor '09-'10-'11
Thanks. I know it takes more voltage to open the cutouts than the TPS sees so I was going to wire them into some relays so that when the TPS is in "X" voltage range the cutout is closed, then "Y" voltage would open it part way and WOT would be full open.
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
It wouldn't be that hard to program a little controller that said when >__ voltage (TPS) then apply voltage to cutout and when <__TPS close.
Thread Starter
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
The problem I see is that electric cutouts are slow unlike the vacuum solenoids on the dual mode exhaust. So lets say you get your revs up and they drop quickly then the e-cutouts wont be able to keep up. I also think that they are not made to constantly to be opened and closed... I wonder if there is a way to hook the electric cutouts up to a vacuum solenoid (replace the electric motors with vacuum solenoids)?
Race Director
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
Here's a picture of a C6Z06 muffler. The inlet is way too high to fit a C4. I removed my 08Z system and replaced it with B&B Fusions which still retain the dual mode feature and I installed a switch on the dash to open and close them anytime. The mufflers are constructed so the valve when open goes through a straight perforated pipe in the center of the muffler out both of the outlets. When closed, the exhaust is channeled a roundabout way inside the muffler and out only 1 of the outlets.
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Last edited by 383vett; Nov 19, 2010 at 10:14 AM.
Thread Starter
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Here's a picture of a C6Z06 muffler. The inlet is way too high to fit a C4. I removed my 08Z system and replaced it with B&B Fusions which still retain the dual mode feature and I installed a switch on the dash to open and close them anytime. The mufflers are constructed to the valve when open goes through a straight perforated pipe in the center of the muffler out both of the outlets. When closed, the exhaust is channeled a roundabout way inside the muffler and out only 1 of the outlets.
[/QUOTE][/QUOTE]So you dont think there is any way to make them fit?
Race Director
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
There is always a way, just depends on how much cutting and modifying you want to do. The inlet on the muffler is very high and I don't think there is enough room on the c4 without major hacking to the car. I'm just going by memory because I am at work and the car is at home. The muffler inlet can't be dropped because it lines up with the internal pipes within the muffler. Willie
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Thread Starter
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
There is always a way, just depends on how much cutting and modifying you want to do. The inlet on the muffler is very high and I don't think there is enough room on the c4 without major hacking to the car. I'm just going by memory because I am at work and the car is at home. The muffler inlet can't be dropped because it lines up with the internal pipes within the muffler. Willie
