I’ve had a turbocharged car with a 10 speed auto. Same behavior. Nothing about the transmission type changes changes how exhaust pressure works when the throttle is closed.
Nitpick.
A “backfire” is when a car ignites the charge in the intake plenum / manifold and the fire literally backs up the opposite way to the normal flow. This was common back in the days of manual spark advance. i.e., the 1920s. Not so much since. A backfire also often blew the air cleaner off the top of the engine, and sometimes started a fire under the hood.
An “afterfire” occurs when the charge ignites in the exhaust manifold. That’s a very different beast and that’s what’s going on with all the obnoxious trailing throttle popping & crackling of modern “tuner”-chipped cars.
The computer is deliberately injecting unburned fuel into the exhaust stream by cancelling a cylinder’s ignition but not its fuel charge and/or timing the ignition pulse to coincide w the exhaust valve still being open. Along with also opening the muffler bypass flap so we can all hear it.
This is because some subset of idjits thinks it sounds cool, and some subset of manufacturers’ engineers & marketers want to cater to that desire for cool. Plus of course the folks selling tuner chips so even your family wagon can pop and crackle like a breakfast cereal.
I’ve always been more into performance than noisy aesthetics. When I see some guy do a burnout my comment is always “Scrimped on your tire budget I see.”
I once watched a truck burn off about $100 worth of rubber so it would hide the license plate from a red-light camera. the driver then went on to run a red light. I figure he gave himself a $100 ticket for his efforts so all was right with the universe.
Motortrend picked up the story and confirmed that the car defaults to normal mode on startup and that is the standard the state must use.
I expect the Judge to throw it out and reinstate the registration. and the driver’s license plate will be added to LEO Bingo In Riverside CA.
Update:
Hyundai Steps In To Help Elantra N Owner Ticketed for Loud Stock Exhaust
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Hyundai took the car to its own testing facility and claims there’s nothing wrong with the car.
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According to the driver, who goes by OkCandidate103 on Reddit, about a month ago Hyundai picked up the car, brought it to the HATCI (Hyundai American Technical Center Inc.), and provided a hybrid loaner to drive around in the meantime.
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OkCandidate103 hired an attorney and has a court date scheduled for February 23.