What causes your exhuast to pop and burbble on deceleration?

[Qualitywires.com]

I like the way it sounds but I heard it does that due to a leak in the exhaust? I kind of wondering if one of my exhaust band straps are loose.

 

[Viperzilla]

I don't think that's exactly correct. My dad had a good size leak in my present car a few years back, and it didn't pop or burble (although only a 1.6 4 cyl).

 

[Shelby3]

If it was the exhaust straps, I'd loosen all of mine. On my Roe car, the VEC 2 can shut off the injectors during deceleration to minimize the pops. That's an option I have declined. I have yet to hear a Viper that I thought was too loud.

 

[Mopar Steve]

Usually happens more without cats. This is from unburned fuel "exploding" in the exhaust rather than being consumed durring the combustion process. This unburned fuel is what the cats burn off in an unmodified exhaust. This is also what causes the cats and side sills to become so hot, and why the sill feel so much cooler without the cats.

 

[NascarDave]

AB,
Steve is right on. The situation can be further exaggerated by a fuel computer, such as a VEC.

DN

 

[Qualitywires.com]

I had thought it had something to do with the fuel. Mine does it quite a bit but it's not a back firing noise...I love it!

 

[pullshard]

It's to much fuel. Mine did not do this with the f-up paxton fuel system. It now does it with the vec II though. My car also loads up a little now. But Right now I would rather have this car run rich then lean.

 

[BIGBADCJ]

its cold air being sucked back into the motor through the exhaust. all cars do it with out cats or mufflers.

 

[Chuck 98 RT/10]

Give your cam more duration and maybe you'll get more exhaust flames. Poser.

 

[Gerald]

Step away from the keyboard Adam, your using up valueable forum space with your *** posts.

 

[ssssssnake]

That’s the sound of MUSCLE. I love that sound. I wish it was louder. Mine does the same, and I have no leaks. Now I just need some headers to make it even deeper.

 

[AviP]

Mine is bone stock and does it too.

 

[ViperJoe]

Does the less restrictive exhaust and less backpressure have anything to do with it? My Z-06 did it stock and with the Borla cat-back, as did the Viper with the Corsa (but not stock)

 

[PaViper]

Mine has gotten noticeably more of them (pops and burbles) and louder since I put the cat back exhaust on

 

[VOI9 ASP]

You guys are close... It's actually a slow leak in the flutz capacitor just below the knute valve modulator. It will not hurt anything. If you add a bit of ****** synthetic 40w oil to the tip of the capacitor below the fractator input it will improve not only the sound but the timing and fuel usage.

 

[PaViper]

You guys are close... It's actually a slow leak in the flutz capacitor just below the knute valve modulator. It will not hurt anything. If you add a bit of ****** synthetic 40w oil to the tip of the capacitor below the fractator input it will improve not only the sound but the timing and fuel usage.

I thought so too at first, but the B&B catbacks come with bigger flutz capacitors and were pre oiled.

 

[HOdbleFman]

Stuff an old pair of socks into the tail pipes to dampen the sound. It also adds some more low end torque.

 

[VOI9 ASP]

Yes, but the socks should be made out of fiberglass for best performance

 

[Qualitywires.com]

UUGGHH! How did this thread go to hell?

LOL!!

 

[Tom F&L GoR]

Obviously the muffler bearings are shot.

 

[Sean Roe]

If you do a dyno pull on a Viper and leat the dyno continue to sample on deceleration, you'll see that the A/F ratio goes super rich at more than 10:1 (that's as rich as the meter reads) for quite a while.
When you get off the gas, the injectors stay on.
If someone with a VEC2 wants to turn them off, go to the Fuel Load page and set the deepest vacuum cells (active during hard decel) to negative 4-6ms, which will turn the injectors down (must be software S106). We did all the testing on the dyno and were able to easily see the difference on the graph (as well as hear it).

Regards,
Sean

 

[superdavz]

That’s the sound of our snakes spitting out all the corvettes that we eat!!

 

[Bandit3]

Tooo funny

 

[Dash Riprock]

Hey Jerry & Pa Viper it is flux capacitor. When giving information as important as this the spelling must be right. How would it look if ab went to the local autozone and asked for a flutz capacitor? They might think he didn't know what he was talking about.

Dash
2004 SRT10

 

[Chuck 98 RT/10]

Obviously the muffler bearings are shot.

Didn't you use that one before? I like it so much I'm stealing it for the next AB "Why does my Viper..." post.

 

[RedEnuf93]

The little POP's and BURBLE's are small Nitrous bubbles!!!

Now... Get a full tank and hear BIG POPS!!

 

[proracer1]

LOTS OF FREAKIN HORSEPOWER

 

[Dimitrios]

mine does it at about 4-4500 rpms when i let off and are really lound as one other viper owner said "like a series of gunshots" it doesnt do it all the time though only when its cooler out. is this normal?