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Discussion Starter #1
So I was accelerating hard from a rolling start several times the other day, and once on the 1 to 2 shift (6-spd manual) I got a really loud, impressive, backfire as I came off throttle for the shift in sport mode (2019 Cayman S, so has sport exhaust). I’ve tried to reproduce this several times since, yet have been unable to get the cool loud backfire during the shift. Any ideas? Anyone able to get this consistently? I also got it once on a hard rev-matched downshift, but alas can not reproduce.

Is Porsche just playing with us? Giving the loud backfires only a small percent of the time so that, like addicts, we will try again over and over to get the experience another time??
 

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I know in my car (with Sport Chrono), when it's in Sport mode (not Sport+), it makes all sorts of gurgle-y exhaust noises
 

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On the PDK, I’ve noticed that the backfires only happen when coming off the gas above 4K revs in Sport Mode.
 

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I dont really get any pops and backfires but then my car is mid-2019 so it has a GPF - this apparently makes the exhaust less likely to crackle etc, and is also a touch quieter.
 

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Pops and gurgles are one thing, a true backfire is another. That means a lot of unburned gas got into the exhaust. The explosive combustion produces a shock wave in the system, which in a street car you intend to keep for a while can't be good.
 

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I know in my car (with Sport Chrono), when it's in Sport mode (not Sport+), it makes all sorts of gurgle-y exhaust noises
Last April, when my Boxster was presented to us at the Atlanta PEC, it was explained that Sport+ maintains a few pounds of boost pressure to get a bit of a head start if you want sudden acceleration. They added this also holds the exhaust back pressure a bit higher because of the load on the turbo and this suppresses the burbles and pops.

In Sport mode the throttle is noticeably (but not dramatically) more response and the exhaust sounds wonderful. I am always in Sport mode mostly because I love the exhaust sound and it keeps the **** engine from stopping at a light. However, I would not want the exhaust any louder because it would then, IMO, start to sound like an aftermarket exhaust system.
 

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My guess would be throttle too deep for the engine speed paired with an abrupt shift.

Strong backfire not a desired nor designed result.
 

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Last April, when my Boxster was presented to us at the Atlanta PEC, it was explained that Sport+ maintains a few pounds of boost pressure to get a bit of a head start if you want sudden acceleration. They added this also holds the exhaust back pressure a bit higher because of the load on the turbo and this suppresses the burbles and pops.

In Sport mode the throttle is noticeably (but not dramatically) more response and the exhaust sounds wonderful. I am always in Sport mode mostly because I love the exhaust sound and it keeps the **** engine from stopping at a light. However, I would not want the exhaust any louder because it would then, IMO, start to sound like an aftermarket exhaust system.
Thank you. I noticed more burbles in Sport than Sport+, and prefer the burbles. Now I know why
 

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OP, I have a manual base 2019 Boxster and I occasionally get a real loud backfire (beyond the usual snap crackle and pops) in sport mode (not sport plus, no SC). I am actually trying to figure out how to avoid it because it happens in some situations where it isn't really appropriate (accelerating from a stop light in a small town in the quiet evening...duck and cover...) I think it is the fairly brisk acceleration to 4-5K with sudden lift off that triggers it.

Guess I'll have to go out and do some experimentin' :)
 

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I think it is the fairly brisk acceleration to 4-5K with sudden lift off that triggers it.
Gets my vote.

ECM's just gettin' all fired up, bringin' on the fuel, and whammo...gear change!

Can't bake a cake half way.
 

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Discussion Starter #13
Bluenorther - thanks for the reply. It’s definitely an engineered thing in Sport mode (not some sort of pilot error — you can’t make a modern vehicle with ECU backfire with throttle application) I’d just like to know how to purposely trigger it. It’s very impressive and sounds cool. If you figure out how to make it happen please let me know. My working hypothesis relates to having driven it hard just prior to the quick acceleration and upshift.

Sorry to sound ‘jerky’ here, but to the rest who complain, just turn off the sport exhaust and/or use normal or sport+ if you don’t like the exhaust antics. I don’t always want it either — simple fix to take it out of sport mode.
 

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Noise you say:unsure:.........my wife won't let me put the stereo on when we're in the Porsche because she wants to hear the engine symphony.;)
My response was to the BlueNorthern's comment about the exhaust noise level being a problem in urban surroundings.

Both my wife and I drive it on Sport Mode with PSE on. We never listen to the stereo. I because I want to listen to the engine/exhaust, my wife doesn't like the stereo because she wants me to listen to HER.
 

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I quite enjoy the pops and backfires, although do concede they can become a little ‘embarrassing’ at times.

As many have already said, Sport mode (as opposed to Sport +) produces the most noise / over-fuelling.

The easiest way to induce pops is to accelerate hard (i.e. wide open / full throttle) to beyond 3,000 rpm and then lift off. And if you want the pops to continue, quickly tap the again throttle after the lift off..just a lightish tap / blip (don’t go full throttle again as it doesn’t work ). You can do it again and again and it will continue to pop away. Takes a little practice but it’s easy once you’ve got the hang of it.

The more aggressive backfires are induced by downshifting at higher rpms (say above 4,500) and going back on the throttle; such as going into a corner and rolling back on the throttle at the apex.
 
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