Revving and shift change crackling

[smcoggins]

I have a 2016 l86/8l90 combo swapped in my 48 Chevy pickup. I have doing a little tuning with the MAF and VVE tables. I have also disabled DOD, DFCO, and Catylst. I have a CAI and a a free flowing exhaust. The main thing that is annoying me on this swap is the crackling with the free exhaust that it makes after revving it and letting off in neutral and park. It also does that annoying sound on shifts as well.

When I datalog it, from my amateur tuning knowledge. The computer seems to be pulling/adding a decent about of timing during these events under the Torque Management Advance. This seems to be retarding timing rather than adding.

Would this rapid change be what's causing the crackling/popping through the exhaust?
If so what would be the tables that could help this.

Thanks

[TriPinTaZ]

Minimum Spark Tables are believed to be the "floor" of what Torque Management Advance can pull out of the Main Spark values. They might be tuned a little aggressively but also if you're straight piped you may not be able to totally make this go away.

[smcoggins]

Tripintaz,
I will check this minimum spark table out.

[5FDP]

No cats or resonators can make it more pronounced too.

You still want it to pull timing away for the shift just so you know. Some calibrations are up to -20 to -25 degrees, I've done as far up to about -10 without issue.

[MrFixIt86]

Muffle that thing!

[smcoggins]

Guys, I forgot to mention the exhaust is original manifolds to a y pipe and through a muffler. So it is muffled.
I am fine with pulling some during the shifts. 5fdp are you talking about the minimum spark table as well? I just really think the popping/crackling while "revving up" and letting off in park an neutral just sounds terrible. It's nothing like old carbureted engine that have that distinct throttle blades closing revs, if you know what I mean.

[MrFixIt86]

The rev hangs, dumb right!? I think that's due to the high timing advance at the no load areas. Not 100% sure of the benefit there, maybe helps return to idle on decel but id be interested to see if its snap back down to idle if you brought timing down a bunch on the no load rpm areas...? Do you have exhaust tips? Those help with tone and might hide some of that? Might lose some of it with DFCO enabled