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Old 05-08-2013, 06:55 AM   #1
Stephen12ZL1


 
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Homemade Mild to Wild switch for "closed" at idle ?'s

I know the typical "mild to wild" switch will only do a stock position or open position. With my exhaust as it is, I would love to have a closed position at idle or startup. ADM has some sort of stealth exhaust setup for this situation but I'm sure some of you here have done this already. Any help would be greatly appreciated. Hognutz?
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Old 05-08-2013, 08:33 AM   #2
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Sounds interesting
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Old 05-08-2013, 09:10 AM   #3
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Quote:
Originally Posted by Stephen12ZL1 View Post
I know the typical "mild to wild" switch will only do a stock position or open position. With my exhaust as it is, I would love to have a closed position at idle or startup. ADM has some sort of stealth exhaust setup for this situation but I'm sure some of you here have done this already. Any help would be greatly appreciated. Hognutz?

Too many complaining neighbors in the morning? Tell them to move!

Anyways, I had my bumper off the other day and it looks like its vacuumed controlled (I could be wrong), if so I'd say you probably could add a T into the existing line and add your own vacuum and switch to control it being closed on start up. Dunno for sure it was just a thought.
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Old 05-08-2013, 09:28 AM   #4
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The issue I see is that the "at rest" state of the valves is open, so if the car has been sitting they will be open at startup for a second or 2 even if commanded to shut. The best way would be to add an actuator that keeps the valves closed the releases.

I did the hillbilly method for testing and took tie straps to hold the valves closed. I wanted to hear the difference and it is quieter on startup.
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Old 05-08-2013, 09:31 AM   #5
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my .02 is look for the little module that controls the vaccum. In my mind the harness into that should be where you need to tap into do do that.

I just want to make that wired like the vett's and on/off type wiring instead of this built in rpm control liek the ZL1 has. or do a 3 position setup off/on/stock

I have not done this yet but this is where I am going to start looking when i do. in my mind hopefully there will just be say no voltage to a wire at idle and then past the rpm point there will be voltage. once you were to find this wire your good to go. there are other ways they could control that though so this is all speculation on my part.

I am pretty sure I saw someone say the other day there was just a gray wire in that harness the tapped into or something. a voltmetter or test light should tell the whole stroy on this setup.

This seems easy to do in my head I just have not got the coin together to by my headrs yet.
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Old 05-08-2013, 11:35 AM   #6
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Quote:
Originally Posted by mmarx82 View Post
Too many complaining neighbors in the morning? Tell them to move!

Anyways, I had my bumper off the other day and it looks like its vacuumed controlled (I could be wrong), if so I'd say you probably could add a T into the existing line and add your own vacuum and switch to control it being closed on start up. Dunno for sure it was just a thought.
Wife complaining is much worse! She's says its gone from loud to obnoxious! I will check that actuator and the wiring. Thanks.
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Old 05-08-2013, 11:36 AM   #7
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When you use mild to wild switch, when in mild the car will operate as designed the valve will open when rpm's reach 3500. When switched to wild it disables that functionality therefore the valve is alway open.

Are you sure a mild to wild switch would not solve the issue entirely?

What am I missing?
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Old 05-08-2013, 12:24 PM   #8
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Quote:
Originally Posted by ZL1Naboz View Post
When you use mild to wild switch, when in mild the car will operate as designed the valve will open when rpm's reach 3500. When switched to wild it disables that functionality therefore the valve is alway open.

Are you sure a mild to wild switch would not solve the issue entirely?

What am I missing?

Your missing that on the ZL1 the stock setting is for the valves to be open when at idle and open when at full throttle. He wants the valves to be closed at idle. The mild to wild switch will only leave it open all the time or let the system run in the stock setting which is open at idle.
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Old 05-19-2013, 07:34 PM   #9
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anyone done this yet or confirmed operation?
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Old 05-19-2013, 08:49 PM   #10
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there is a wire coming off of the FPCM that controls the opening or closing of the exhaust,
just switch it there......that's what I did , closed or open when ever I want.
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Old 05-19-2013, 10:01 PM   #11
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Not so easy. The vacuum operated valves are OPEN when the car is off, it is their "resting" state. To have them fully closed AT startup every time a mechanical device would need to hold them closed. I "hillbillied" it by using zip ties to hold the valves closed so I could hear the difference. There is a fairly noticeable difference.
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Old 05-20-2013, 04:38 AM   #12
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I would think you could do this... http://www.camaro5.com/forums/showthread.php?t=226858

But instead of a ON/OFF switch use a ON/OFF/ON and run a wire for the extra ON to a (constant power/something that has power when the car is on). So in ON position 1 it will run factory, In the OFF position the flaps will be open all the time, and in ON position 2 the flaps will be closed all the time.
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Old 05-20-2013, 08:34 AM   #13
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That won't work. The valves need something mechanical to hold them closed at start.
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Old 05-23-2013, 04:48 AM   #14
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Quote:
Originally Posted by revo1059 View Post
That won't work. The valves need something mechanical to hold them closed at start.
Only for a second when you first start the car I'm thinking. Its just up to the person if they want a semi-permanent solution to keep it closed all the time, or have a switch where they can be selective with a second of lag when the car is started.
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