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Exhaust Adaptive Valve

MotoMedic

By MotoMedic
in Engines & Drivetrain

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Guapoh Enthusiast

Guapoh

Posted
Posted

Wow, cool info. Just joined this forum this morning in advance of my delivery of my custom built to order 2014 Sierra All Terrain 6.2.

 

Will certainly do this on day one until my aftermarket solution is in place.

  • 1 month later...
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CorvetteOJ
CorvetteOJ

Hey Medic, when I read your post, I immeidately remembered when I was a kid, (teenager) guys would stick raw potatoes on the end of someone's exhaust pipe, and in most cases, would get the same effect

iCryWheniGoPoop
iCryWheniGoPoop

What Dave said... whats it going to hurt anyway, just put a $2 hose clamp on it for now and see if you like it. If you don't... crawl back underneath it and take 30 seconds to pull it back off. Its ha

45acp
45acp

I like the hose clamp idea. Cheap and easy to try and if you don't like it take it off.   DJ

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jmitchell Enthusiast

jmitchell

Posted
Posted (edited)

I have a 2015 Tahoe and have the same squeak or whistle noise coming from the exhaust only when going from V4 to V8. Thanks to this forum, I'll be fixing this annoying problem tonight!!! Thanks for the info guys.

Edited by jmitchell
  • 3 months later...
f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

Man you guys are awesome with this info. Can't wait to try mine on 14' 6.2

Sermed Enthusiast

Sermed

Posted
Posted

i put the clamps on , and i love it, specially when i start the car and when i am slight over raving it on the streets

chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted

so I have a Borla Cat-back exhaust, would i still have the flappy flap valve?

In the exhaust system thread there is a discussion about the Borla exhaust. The GMPP Borla exhaust system purchased from GM dealers does have an adaptive valve, but it is a different version than in the stock GM exhaust. The Borla exhaust system from Borla does not have the adaptive valve.

f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

Hey guys how much is this flapper have to be tightened down? I'm trying this on mine but even with a clamp it doesn't seem like it's tightened much , if any. Any advice or suggestions?

JAF1 Enthusiast

JAF1

Posted
Posted
I didn't have the right size hose clamp so I used a nail instead. Just thought I would share.

2014 10 11 13.29.44

2014 10 11 13.29.21

 

f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

I didn't have the right size hose clamp so I used a nail instead. Just thought I would share.

 

Can you please take a side shot ? Would like to see how much room in between is left once it's all the way open. Thanks

JAF1 Enthusiast

JAF1

Posted
Posted

Can you please take a side shot ? Would like to see how much room in between is left once it's all the way open. Thanks

Not sure exactly what you're asking. I simply twisted the valve open and wedged a nail in between the two square flanges. I was going to cut the nail off but it just worked out that it sits on top the pipe. Took a few different nails to find the right one.

f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

Thanks man I appreciate the help. Just trying to figure out if this valve twists closed or needs to be hammered straight down. I tried mine and I heard this whistling sound.

MudMutt Enthusiast

MudMutt

Posted
Posted

I just popped a small nail as JeffF suggested and it works pretty well ( easy install and removal) ... I really was not having an issue but these exhaust systems are restricted enough as is. I believe motors should be able to breathe some. Took it for a spin and it does sound somewhat louder. As far as the drone in 4V it's not too bad ... Gone to cruise it for a week or so to see if I leave it open.

bdbake01 Senior Enthusiast

bdbake01

Posted
Posted

Seems to be an appropriate thread for this. Looking for ideas. I'm 99% of the way there for my "perfect" exhaust note. One lingering issue is what I'm calling the "flapper slap".

 

Go ahead...make fun. Or come up with a better name.

 

Basically I have the tone & volume that I want, but when I cold start or rev it, the flapper slaps open, then closed, and maybe open again a few times and I get a metallic, clanky noise when it hits full open/closed. I need to dampen this just a bit to take the edge off. I like the adaptive nature of the valve, it does good things to the tone at the right times IMHO, but I need to get rid of the slap.

 

Open to ideas. To be honest, I haven't tried much. Thinking of tack welding on some artificial stops lined w/ high temp/durometer rubber.

  • 2 months later...
Jaybridge88 Enthusiast

Jaybridge88

Posted
Posted (edited)

Im new to the site and see this is an old thread. Since I've got my Silverado I have been researching things and find my google searches bring me to this forum quite a bit. Figured I would try to add to the great info I have found here.

 

Ever since I hit about 2k miles I noticed a faint squeak noise when it shifted from V4 to V8 mode. Happens pretty much every time. I took it in for its first oil change and told the dealer about it. They put about 20 miles on the truck doing tests. They diagnosed it to be a faulty adaptive valve in the exhaust and are ordering me a complete new exhaust cat back. I tried to work with them to some how get a credit towards aftermarket but that was a slim chance. Glad they are fixing it though.

Edited by Jaybridge88

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