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Exhaust Adaptive Valve

MotoMedic

By MotoMedic
in Engines & Drivetrain

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stevev Enthusiast

stevev

Posted
Posted (edited)

^welcome Jay. If you see some other threads, those owners that had their exhaust system replaced still had the squeak/chirp come back. Instead of wasting time at the dealer, I just clamped my valve open. But now I do get a slight drone in V4 mode.

Edited by stevev
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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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Jaybridge88 Enthusiast

Jaybridge88

Posted
Posted

Well damn it! Haha. They said it was a "faulty valve" so I figured a new one would fix it. Thought I read someone thought it was redesigned. I'll go aftermarket...... eventually. Thanks for the info.

morrislee Enthusiast

morrislee

Posted
Posted

Can someone help me understand? Is this valve normally opened when the truck is off? If that is the case, I should be able tp turn only one direction and clamp it down?

hotrodz37 Senior Enthusiast

hotrodz37

Posted
Posted

I clamped mine open due to the chirp. Have had it clamped open for about 9 months now and no issues, couldn't tell it was in v4 at all. I have completely stock exhaust, only change is the valve open. This morning on the drive to work, it kicked into v4 and I got the "helicopter noise" and it was pretty bad. Wondering if any of you are experiencing this? I am wondering why all of a sudden it started doing it.

MudMutt Enthusiast

MudMutt

Posted
Posted

I clamped mine open due to the chirp. Have had it clamped open for about 9 months now and no issues, couldn't tell it was in v4 at all. I have completely stock exhaust, only change is the valve open. This morning on the drive to work, it kicked into v4 and I got the "helicopter noise" and it was pretty bad. Wondering if any of you are experiencing this? I am wondering why all of a sudden it started doing it.

 

Could be your exhaust is starting to break in and flow a little better and now the v4 drone is a little more noticeable... I noticed mine drone is a little louder since I initially opened my flap also. I only have a little over 3K on the truck. I run the trans in M5 when I am not on the highway so the v4 won't engage.

smit303 Enthusiast

smit303

Posted
Posted

I had mine bolted open for a few weeks but had to revert to normal because I couldn't stand the drone in V4 mode. Very bad around 1200 rpms. The tiny improvement in sound quality when starting up just wasn't worth it.

f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

I did get the v4 drone when I turned mine open but it wasn't all that terrible I have to say. Kinda sounds like a helicopter is outside...lol hey man , I complain about a lot of other things but this one is ok , could be worse.

  • 2 months later...
hotrodz37 Senior Enthusiast

hotrodz37

Posted
Posted

I wonder if there is any kind of lube/ high heat silicon or something to be able to get it to not squeak. Im going to do some research and see if I can find anything.

Jaybridge88 Enthusiast

Jaybridge88

Posted
Posted

The dealership changed my exaust system under warranty 3 weeks ago. While I was waiting for the new exhaust the dealership clamped my current exhaust open. Driving around like that for about 3 weeks.....the exhaust sounded lousy. Loud drone.....got a helicopter noise on decel. I've been driving around with the new exhaust for 3 weeks and it sounds a lot better than when it was clamped open. No squeaks yet. Time will tell. As far as I know it's just the same stock exhaust. They said the other exhaust had a faulty valve.

  • 2 months later...
Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted (edited)

I seriously never had an issue with V4 and exhaust sound on my 2007. I loved the way the exhaust sounded on that truck actually. I want to change my exhaust to be exactly like that system so I guess I just need to remove the flapper valve and the resonator. I don't really care about the 3rd cat.

 

For the guys that clamped their valves open and then got a helicopter type sound, I'm wondering if that sound is from the air passing around the flapper in it's open state and if the flapper wasn't there, the air flow would be more smooth and eliminate that sound?

Edited by Silverado-Hareek
Jaybridge88 Enthusiast

Jaybridge88

Posted
Posted

Not sure if that flap clamped in the open position would cause the helicopter noise.

 

I had my whole exhaust replaced under waranty to fix the adaptive valve chirp. It was good for about 3k miles, but it is now chirping again when going from V4-V8.

 

So all I know is I'm done with this exhaust. Starting to research aftermarket exhausts. I recently drove across country from MA to CA pulling a 12 foot trailer. The trailer was packed. Couldn't fit another thing in it and I had my quad in the bed of the truck. Truck did great pulling through the Rockies. Love this truck but the exhaust has to go.

 

Can anyone recommend a muffler shop in the San Diego area?

Samason1 Enthusiast

Samason1

Posted
Posted

I just got my 15' 2 weeks ago and the first thing I did was drive it from the dealer to my shop and do a full cat back flowmaster system and Volant CAI. Sounds way better than stock.

  • 2 weeks later...
  • 5 months later...
TheBigGrabowsky Enthusiast

TheBigGrabowsky

Posted
Posted

I hope you guys are certain those nails aren't going to fall out. If that mod gets really popular and those nails aren't in there solid then we're going to have an epidemic of nails in tires.

 

Personally I'd just pay an exhaust shop $40 to cut out the flap. Even with it open it disrupts the airflow and creates unnecessary back pressure. This engine has to push through tiny exhaust manifolds, then 3 cats, a flapper and a muffler. Let that baby breath!

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