Exhaust Pops crackles 16-18
 

theres been a few ppl asking about how to increase them and we’ve been hearing that the 2019+cars definitely have more pops coming from the exhaust. this guy posted his stock 2019 file for us to look at and confirms this theory. There are a few tables that effect the decel pops but seems like the min spark tables are what gm changed from previous years. What I did was use the top three rows of both minimum spark tables and blend it in the next row or two. Gm has taken that table further than I have before and yeah it crackles a lot.

My car is a 2019 A10 SS , not 2020 fyi

That's is how I made mine pop more. Dropped the top 2 rows of minimum final spark to like 5. I wouldn't do any blending, though. It can lead to some weird driveability issues. You can also disable DFCO to get a bit more/longer pop.

If I remember right, I only did mine above 2k rpms so I could keep it from popping when I want to (I leave the neighborhood every day at 4:30 am for work).

Yeah people have been recommending around 5. Take a look at the file, it’s much more aggressive than that. People have said that may result in damaging the cats but I suppose not.

If you look at this file it is blended. If you’re not dropping the whole table and only the top rows you might want to blend a row or two as the 19+ file does.

Thanks for clarifying

Not too worried about my cats....

Good info for the guys that kept them tho. Need to go find my hptuners pc so I can look at that file. Dang Imelda flooded me out so all that stuff is stashed away somewhere.

Looks at the top three rows. This is where the decel happens

Ok 17 on top
19 on bottom

That's interesting that the spark timing would have changed between 16 and 19.

Wow, the whole table looks changed.

It's there an easy and safe way for newbies to do this through hp tuners? I just got my car tuned remotely and would like to try this out, but I dont want to mess up the tune that's in it. Mine doesnt pop at all, ever.

Download the file in the op. Copy the top three rows over from that tune into both minimum spark tables in your tune. Take a screen shot and post up what the top 6 rows look like.

Always make a backup copy of the current tune file. Then be sure to do a “save as” and then add the changes to the file name.

Ok, I'll mess with that tomorrow after my dyno, I dont want to mess with it before that, thankyou for the info.

had a bimmer glide up next to me last night with all snarling and popping an shit. looked like he was looking for a run. he jumped me first then i merged to his lane and punched. either i caught him by surprise or he lost heart but he was still pulling before I hit my exit.
all show- no go.

Mine (stock) pops so much my gf said it sounds like farts and is embarrassed to ride with me. :smiling1:


I never test drove the car, so my first time to drive it was when I was driving home. I had no idea it would pop and crackle like that, so it scared me a little thinking the back end of the car was falling apart.


My teenage son came home for the first time since leaving for the military, it was his first time to drive it as well, and when he left his face was sore from all the smiling and laughing!

Mine got tuned by PRAY after headers/TB/IM upgrades and catless and my table looks exactly like the first one and I get zero pop anymore. What else could have been adjusted to remove the pop. I dont want to change things if something else is working to counter it.

All this time I thought the pop'n was an acoustical design built into the muffler, rather than the traditional means of unburned fuel exploding in the exhaust pipes. Is this indeed the case?

So we just copy the first 3 lines on Minimum Spark Base and Long Term with the top 3 lines from each on the 19 tune? My 16 spark looked just like the first one you posted and I get no more pop after my tune. I did before though.

What I did was Highlight rows .12 to .24(maybe even .28) and hit the blend button all the way to the right(green and yellow above and below each other) once or twice. I have to pull it up to be sure but you’re just blending here.

I wish I knew what those graphs mean and what you guys are talking about?
I'll need to watch Goat Garage more and take some Tuning Sch online classes.
However, good to know it can be done!

People actually want their car to sound rich & retarded?

Yes

lDejavul, if you want it to really pop, disable DFCO.

With the 19+ spark table and DFCO disabled, mine sounds like an MG42 on d-day.

I used to think the same way until I went to the Rolex 500 this past weekend in Daytona. Hearing 38 different race cars of different manufacturers and classes rip off three straight downshifts that have that same quote rich and retarded sound is an epic experience. You have every right to not like it but last weekend changed my mind.

subbed for reference

I have a 2019 and coming from a 2016 that had more of a gurgling effect after my tune on the 2016.

The cracking and popping on my 2019 M6 puts a smile on my face.

Ok getting ready to order the HP software but don't really know much. Why is it showing minus numbers??

Would these tables look the same for V6 models? Interesting in trying to mess around with the tables and try to get some pops on the V6.

This would be only accessible through hptuners? The last time I used tuning software was with my tactrix cable & ecuflash from the evo days...

Yes HPtuners and EFI live are the only 2 consumer tuning/scanning software platforms worth a shit for GM.

What in the hell is with all this fascination over popping it sounds like XXXX

I want to completely eliminate it, nothing sounds better than a clean snarl on decel.

So i decided to finally disable the dfco to see how it sounded. But my screen looka much different than the one shown, does anyone know why? Im a 17, and dont want to mess with the timing.

Looks like you’re in basic view. Go to edit select view and than select advanced.

Oh good call, that was it, I changed both rpms to 8k and writing the file now. Thankyou for your help, as always. Fingers crossed it works and i didnt mess anything up

You’re welcome! I’d bet 99.9 to 1 that you’ll have no issues.:happy0180:

You are correct, it worked perfectly! Im gonna give it a week, but im not sure if i like it. I thought it would pop more, buts its more of a gurgle.

So, was it worth it? Any feedback?

I’m with you. If anything I want to get it tuned to remove it.

He can certainly help you if you get stuck or are afraid to mess with the tables displayed above.

So I am planning to modify the min spark tables by doing the following: Instead of copying-pasting the whole top 3 rows of the 2019 table, I will reduce the timing in the Minimum Spark Base and Long Term to 5 degrees in the .04, .08 and .12 rows, as this is where I want the pops on decel. If 5 degrees of timing makes the popping rather aggressive, I will increase the timing values from there to fine tune the amount of pops and crackles.

This is what I will do:

Engine>Spark>Minimum Spark> Base and Long Term (Both tables)

First I will change 0.04 to 0.12 airmass rows by 2000 to 3100 columns to 5.00. I will go higher or lower in the RPM to suit my needs and also go lower or higher with the number to make more or less aggressive pops respectively. I 've been told not to go over 0.12 airmass rows.

I will try with DFCO enabled and then disabled, to see how it sounds and if disabling it affects drivability, deceleration and fuel consumption (not that I care). I will disable as geaux_tigerss suggested in post #23.

By the way, does anyone have the file in the first post of this thread? The link is not functional anymore. Thanks!