Camaro 3.6 with E82 ECU - Recommendations for Crackles and Pops

[SimonTodd]

Hi Everybody

New to the forum, new to Chevrolet Camaro as well, I am in the UK and I have a 3.6 V6 2017 with the ProCharger on it, in fact it was Procharge's prototype car which is still on their website too. I would like to have some crackle/pop on this car, I have attached my original file.

Much appreciated for any or direction help given.

Time to go to bed :-)

Simon

Camaro ECM.hpt

[KillboyPowerhead]

In general you'll want to disable DFCO (deceleration fuel cut-off) so that fuel keeps being injected while off the throttle (Engine > Fuel > Cutoff, DFCO) and retard the spark at the lower cylinder airmass cells (Engine > Spark > Advance > High Octane table) so that the spark/combustion happens near, or even after, top dead center, while the exhaust valves are open. Whatever your cylinder airmass is while coasting, set those cells to a lower number; maybe start at 30 degrees (30 meaning 30 degrees before top dead center), then try 25, 20, etc. until you're satisfied with the gun shots; 0 would mean spark happens at TDC, and you can go negative to spark after TDC. Keep in mind this will toast your cats if you have any, and probably isn't great for the engine itself, the O2 sensors, or anything else either. But it's all about having fun, right?

[SimonTodd]

Any specific recommendations without being too overly aggressive on the CAT? As here in the UK it's Illegal to remove the CAT.

[KillboyPowerhead]

I don't have any experience with this myself, but as mentioned I would start with a moderate 30 degrees or so, or maybe lower the spark by 10 degrees from current/stock and then try it, see how you like it, then drop another 5 degrees, try it out, etc. The lower the number the more damage you'd be doing to the cats I believe, since you'd be making combustion happen later and more so in the exhaust piping rather than in the cylinder. You could also keep the poppin' and cracklin' to the higher RPMs so that it doesn't happen all the time and only when you're having fun, preserving the cats and everything else a bit longer. The highly advanced spark at coasting zones (low airmasses) also helps slow the car down, so you may also notice that more braking effort is required if you reduce timing at the lower RPMs.