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Old 09-18-2013, 08:58 AM   #1
h018871
 
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NPP Stealth mode - added factory & wild modes

although probably not a common occurrence, i wanted to have the dual mode exhaust closed at idle. i came up with the attached fix. there are many ways to skin this cat, i chose this one because it worked for my needs and thought others could get some ideas from it.



There have been several posts looking for a method to have three NPP modes incorporated into a single switch.
Stealth – exhaust flappers closed all the time
Factory – flappers operate as per the factory parameters (more below)
Wild – flappers always open

I created a second DIY to show one way to do it
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File Type: pdf NPP_StealthMode.pdf (927.7 KB, 810 views)
File Type: pdf NPP_StealthFactoryWildModes.pdf (804.0 KB, 525 views)
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Last edited by h018871; 02-23-2014 at 02:43 AM. Reason: added 3 mode control
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Old 09-21-2013, 08:17 PM   #2
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Thanks again for the DIY How To man...
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Old 11-18-2013, 02:11 PM   #3
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BUMP
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Old 12-14-2013, 05:36 PM   #4
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great write up thanks.
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Old 02-23-2014, 02:47 AM   #5
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Single Switch, 3 Modes UPDATE

edited first post to add a DIY for a single switch controlling 3 modes
Stealth
Factory
Wild
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Old 02-23-2014, 10:16 AM   #6
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Sweet, now I really want to do this. There is nothing more to want for this mod... Thanks again man.
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Old 02-23-2014, 01:49 PM   #7
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I wish I was more electrically adept
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Old 03-04-2014, 09:59 AM   #8
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Quote:
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I wish I was more electrically adept

Agreed, this is so awesome but I have no electrical knowledge or comfort. Sadly I think I will stll end up dropping $200 for the ADM controller, and will only have 2 functions.
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Old 04-15-2014, 10:41 PM   #9
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Alternate Method

Hey, I don't mean to put you down, you did a great job figuring that out and it will work perfectly that way, but there is a much simpler way to accomplish this.

You can cut the blue/yellow wire going to the rear fuse block, and wire in an on/off/on rocker switch. Here is a crude diagram of how I wired my NPP.

When you're done, the 3 positions will be flaps Closed/Open/Normal.
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Old 04-16-2014, 06:08 AM   #10
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Brilliant!
i did not think of that method, much cleaner.
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Old 04-16-2014, 08:31 AM   #11
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Okay... so my electrical experience is limited but how does this last method work? You have one wire that you interrupt. I assume you cut it then a three position switch with an extra ground... how's that make this happen?

If it works I'm all for it b/c cheap and easy. I would like to understand it more though.

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Old 04-16-2014, 11:11 AM   #12
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UNMODIFIED: When the controller is energized it grounds the valve relay to close the exhaust.
Inferno1LE's mod: position 1 acts like factory, position 2 opens the wire so the relay stays open, position 3 connects the relay to ground.....putting the relay on all the time

Sweet & simple solution. Kinda embarrassed that I didn't think of it
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Old 04-16-2014, 04:10 PM   #13
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Quote:
Originally Posted by h018871 View Post
UNMODIFIED: When the controller is energized it grounds the valve relay to close the exhaust.
Inferno1LE's mod: position 1 acts like factory, position 2 opens the wire so the relay stays open, position 3 connects the relay to ground.....putting the relay on all the time

Sweet & simple solution. Kinda embarrassed that I didn't think of it
Sometimes we get so involved in our original idea we forget to think of another path.

So verdict is both methods work?

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Old 04-16-2014, 09:32 PM   #14
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Yep
They should both work............ Simple or Goldberg method-->same result
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Old 04-16-2014, 09:59 PM   #15
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Quote:
Originally Posted by h018871 View Post
Yep
They should both work............ Simple or Goldberg method-->same result
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Old 04-18-2014, 10:47 AM   #16
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When I was first looking at doing this, I kept looking to modify something after the relay too. Eventually I got to the point where the new relay I was adding was wired the same as the factory one, and after I slapped myself silly, I just added the switch. It's an easy thing to miss.
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Old 04-24-2014, 06:10 PM   #17
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Thanks to h018871 for the write up and to Inferno 1LE for simplifying it. I just finished doing this mod and honestly the hardest part was figuring out where I wanted the toggle switch and getting the wires there. This is a great addition since I just added a stage two cam, long tube header and high flow cats. I was running the pulled fuse setup, but that was a bit much for my neighborhood now. Also, the potential of waking up my 2 year old bothered my wife a bit. She actually loves the sound, just didn't want her waking up because of it lol.

Thanks guys
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Old 04-25-2014, 06:08 AM   #18
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Here you go guys, the end result of this awesome mod. Thanks a lot to h018871 for ALL his help, I really love having this switch.

http://www.camaro5.com/forums/showthread.php?t=354790
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Old 04-25-2014, 08:26 AM   #19
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Looks like I am doing some wiring this weekend.
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Old 04-25-2014, 10:19 AM   #20
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Holy crap, this is awesome! Thanks guys!
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Old 04-27-2014, 10:40 PM   #21
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rheostat?
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Old 04-28-2014, 01:56 AM   #22
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I'd love to see someone come out with this setup in a kit. Similar to the Mild to Wild DIY


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Old 04-29-2014, 07:13 PM   #23
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Quote:
Originally Posted by h018871 View Post
UNMODIFIED: When the controller is energized it grounds the valve relay to close the exhaust.
Inferno1LE's mod: position 1 acts like factory, position 2 opens the wire so the relay stays open, position 3 connects the relay to ground.....putting the relay on all the time

Sweet & simple solution. Kinda embarrassed that I didn't think of it
Will position 3 above leave the exhaust closed at start-up as well then?

I was thinking about buying the ADM controller, but this is better than any aftermarket solution I've seen yet.
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Old 04-29-2014, 08:16 PM   #24
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Yes. I use mine that way in the garage as not to wake the kids.
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Old 04-30-2014, 12:43 AM   #25
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Quote:
Originally Posted by tramtwo View Post
rheostat?
tramtwo
not sure if you are joking or serious.........

no if serious


BUT: if you wanted a variable close on the flap
hmmmmmmm, would have to be a vacuum regulator instead of on/off
interesting idea
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