Ironhide148

Ive got a 15 Z51 A8 C7, When I release the gas right before the third gear, there's a low chance that my car will give off a couple loud bangs. Backfire or crackles I would say.

but that's not enough, I need more. What can I do to achieve more crackles?

Downpipes? Muffler delete? Borla Atak muffler exhaust?

Thanks a lot!

Snowwolfe

Your kidding, right?

N2TU

dvilin

Pull fuse #42.

C6 MoneyPit

X-Pipe and muffler delete or bullets is one option

Ironhide148

I've tired that, no difference

Ironhide148

what do you mean by bullets?

Rave

Perhaps the 2018's will incorporate more back firing.

Snowwolfe

Take it to your local tuner and ask them to retune it so it backfires more

lancekl

borla x pipe

joemosfet

The noise you hear during over-run (when you lift off throttle under mid and high RPMs) can sound like crackling, burbling, popping, etc, and happens when you have hot high-speed exhaust gasses that is immediately followed by cooler, low speed exhaust gases. The pressure difference between the two equalizing pressure zones traveling down the length of the exhaust causes that awesome noise that we all love to hear.

It's all dependant on the car's tune, the exhaust design, the flow of the engine, and how restrictive / muffling the resonators and mufflers are. Even the temperature of the exhaust piping has an effect: a cool exhaust will enhance this over-run noise by encouraging the formation of these pressure zones.

The NPP exhaust helps muffle this by providing some restriction that forces those pressure zones to combine early as well as forcing the exhaust gases through the mufflers to further lower the noise.

Foosh

Some manufacturers purposely tune the ECM to induce this. The Jaguar F-Type is the best example. The engineers purposely coded the ECM to direct inject a little extra fuel during deceleration.

I honestly don't know how they got by the noise standard test, but OMG it sounds glorious.

phantom1

I notice it back fires alot more in Track mode. Do you notice any difference in Track mode?

owc6

Are you downshifting or upshifting? Not sure from your post, but if you are talking about at WOT, there is a momentary cut off of fuel to facilitate faster shifts, which is most likely what you are hearing. You will get that more consistently if you DON'T lift off the go pedal. It is not necessary to lift off the gas when accelerating.

And obviously, a louder exhaust will make the noise more clear.

jasonyyu

I was gonna create a tread on this as well.

I had been running muffler delete for a while until I installed the corsa xpipe and extreme exhaust last weekend. To be honest, I am quiet disappointed by the corsa set-up. It is as quiet as ..... I no longer have that popping sound anymore.

Would the main cats delete solve this problem?

berk4422

On my C6 with H/C/Exhaust, the tuner tuned out fueling on deceleration. It took away the snap/crackle/pop. I missed it so I went back to the tuner after a month and it took him 2 minutes to add fueling on deceleration back in. On the C7, track mode on sound management option leaves the valves open 100% of the time. I'm guessing more fueling on deceleration pop can be tuned in??

Foosh

Jason,

Possibly while creating a whole lot more.

Maxpowers

As Foosh said the F-Type mastered the art of snap crackle pops. This is engineered into the fuel management system.

It would be interesting to know if a tune could duplicate this in the C7. And if yes, what the long term affects would be.

I love this sound.

LimeRay

Trade it in for a manual. I drive mine is sport most of the time and with rev match on it's on and poppin'.

lakemg

Autos have rev match too...