I want to increase popping on decel

[TriPinTaZ]

I have a cammed 2001 Z06. MY tune allows a little pop on deceleration and gear changes. I dropped the VE tables 20% in the 0% throttle range to make this happen. It used to do it better when it was stock.

My buddies 01 Camaro Z28 pops a lot more than my car and it sounds awesome. Is there a trick to getting more popping on deceleration?

Thanks

[Fox95]

introduce a air leak into the exhaust system at headers, very effective on decel backfire.

Maybe you could get a special operating system from HPtuners that turns on the air pump only under closed throttle conditions. J/K

[DSteck]

Take air out of your MAF frequencies that are below the frequency you normally idle at (assuming you still have the MAF enabled).

[gman4dx266]

introduce a air leak into the exhaust system at headers, very effective on decel backfire.

Maybe you could get a special operating system from HPtuners that turns on the air pump only under closed throttle conditions. J/K

LOL good one!

I never really thought about how to increase the decel rumble/popping. I think it s kinda neat sounding when i pull a manual downshift to slow down and such, but it's one of those things that I imagine is easy to over-do.

[kamikazematt]

correct me if i'm wrong but is the popping caused by raw fuel(rich mixture) being in the exhaust stream and hitting a hot spot?

[MMGT1]

You got it. Unspent gasses igniting in the exhaust system

As far as increasing the popping, I'd use the DFCO tables. Increase the fuel a little in DFCO and I think you'll get what you are after.

[WarWagon]

I noticed I increased my cackle while working on backing my TBSS hanging idle off. As I am working on a LS2 the specifics may not apply, but the idea is the same.

Thoughts of shattering a cat or splitting the muffler wide open come to mind from doing this...

However to do this with flair:

Old carb cars never shut off the fuel, they did have a solenoid to keep the throttle open on severe deceleration. Like taking a 455 Vista cruiser wagon down a long 7% grade hill in 2nd. So disable your Deceleration Fuel cutoff, DFCO. You need fuel to cackle...

Snapping the throttle "all the way" closed makes the engine instantly rich as condensed fuel laying around evaporates in the manifold and the carb/injectors may be at a higher airflow value for a moment. This is why most fuel injected cars ramp down the throttle. And reason for that carb solenoid. (Slap and release the throttle at idle and watch it hang at 1200 RPM and slowly go back down to 650.) This is also for emissions as rich mix many not burn or burn with high CO. Last that solenoid prevents the engine from stalling on manual trans cars when the clutch is pushed in going from WOT to idle. So the following may stall the engine till you get it tweeked just right.

Get rid of this hang up.

Look for a table like
Idle Proportional Airflow vs. RPM Error
Change the left most values to 2 or -2. (Your values and numbers may be different here.) Watch the tach drop the second you release the throttle.

Also look for and drop the values in the Final Idle Airflow Minimum vs. RPM vs. Gear. This will lower the idle and put the engine into deceleration rather than following the vehicle speed with slight throttle - the goal of any idle airflow over 600 RPM.

Last you can go really crazy and get one of the flames out the exhaust igniter setups. I have seen them on carb cars - not seen if there is a way to do it on fuel injection... Likely there is.

Now don't do this on my street at 2AM

[TriPinTaZ]

LoL great ideas everyone, My new laptop doesn't like my USB to serial adapter so I am waiting on a new one. I will let you all know how these ideas work.

Thanks

[y2konyxss]

my car pops like crazy and i want to get rid of it.

im sure it scares the shit out of people considering i have no cats or muffler, just straight pipe.