Sport mode, louder, how?

TReXing

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In my AMG c63, sport mode, changed everything. It hauled ass yes... but... it also got loud, burped, etc... I assumed a change in fuel ratio, valves? I have not noticed the same in the TRX but I immediately ripped out the factory stereo. I also very rarely run in sport mode (Houston Traffic).
We are similar, but not quite. I have a Dinan M4 and like you a TRX. I have baffles in my exhaust but not sure about the TRX. Exhaust notes change when I’m using paddle shifters and I have a difference in sport or Baja or my custom which is similar to sport but TC on. I have the HK sound but I also have bullet resonators. There’s no wiring, etc to activate baffles ahead of the oem mufflers so if it has baffles… not sure where they are
 

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Ok I have been watching this thread for a while and decided on the drive to work cruise set at 71 mph on flat ground to switch from AUTO to SPORT then back to AUTO. There is a definitive exhaust note change while cruising. The rpm does not move, the truck doesn't feel like it is downshifting to a lower gear (also as indicated by the RPM remaining the same) and the only thing that changes is the exhaust note. Similar to opening and closing an exhaust cut out but not quite as extreme. It is some kind of TRX wizardry or ANC but if it were ANC I feel like the radio sound would have changed as well? I flipped it back in forth a few more times while cruising and for sure the sound changed. I do have two resonators blocked in the back by exhaust bands other wise my truck is stock.
 

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I tried it and didn’t notice any change at all in the sound. The rpm’s don’t change. There are no cutouts in the exhaust system. With those two things being constant the only way for the sound to change would be piped in sound or changes in the ANC programming.
 

Kingcrab

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It’s way more noticeable in person so I urge everyone to try it. Cruise set around 50, manual mode in 6th gear. Flat or slight incline grade. Switch between auto and sport via the TRX screen on infotainment. 100% repeatable difference in tone while engine RPM and gear position remain exactly the same. It does come through in video but the wind noise obscured it a little.


It’s either the noise cancelling or maybe even a slight change in engine timing??? I have no idea but there’s something to this.
My ears are old , and I say “what did you say” a few times a day. But the noise when I can hear something sounds like the Converter changing pitch, or locking up, and unlocking???
 

OnTheReel

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I did think of that, but would expect some kind of RPM change if that was the case.
 

Bambi

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What kind of air did you use? I only used purified triple filtered air when putting air in my tires. I want to that out that new ceramic air.
Fuckin idiot. Everyone knows you need to use nitrogen and 60psi. Are you developmentally challenged? Mom an alcoholic crack head? Both?
 

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. . . without even owning one of these beasts yet, I'll throw my hat in the ring and guess that it has something to do with the transfer case, and the change in power transfer through the front driveline ( front/rear split ) between the two modes.
 
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Jackson

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. . . without even owning one of these beasts yet, I'll throw my hat in the ring and guess that it has something to do with the transfer case, and the change in power transfer through the front driveline ( front/rear split ) between the two modes.

I bet you're correct. RPM would stay the same and a subtle change in how she behaved.
 

NFARVW

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The most obvious answer is usually the correct one. It's most likely ANC programmed to work less intrusive to provide a more spirited and entertaining atmosphere.
 
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The most obvious answer is usually the correct one. It's most likely ANC programmed to work less intrusive to provide a more spirited and entertaining atmosphere.
Yup, kind of what I was thinking too, or hoping anyway. If they were adding sound, that would make it no better than a damn Ford.
 

Jackson

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The most obvious answer is usually the correct one. It's most likely ANC programmed to work less intrusive to provide a more spirited and entertaining atmosphere.

What if the truck no longer has ANC and it still does it?
 

Two

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. . . without even owning one of these beasts yet, I'll throw my hat in the ring and guess that it has something to do with the transfer case, and the change in power transfer through the front driveline ( front/rear split ) between the two modes.
So if you locked the transfer case in 4WD, would that make it really loud? And is low range loader than high range?

Also, do the selectable torque splits override the AWD/4WD/Low range selection, or is it the other way around?
 

BDS TRX

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So if you locked the transfer case in 4WD, would that make it really loud? And is low range loader than high range?

Also, do the selectable torque splits override the AWD/4WD/Low range selection, or is it the other way around?

"if" you locked the transfer case in 4WD? What else other than totally disengaged (Neutral) would it be in may I ask. . .

. . . rolling down the road - it's in either 4WD Auto / 4WD Low / 4WD High
 

Two

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"if" you locked the transfer case in 4WD? What else other than totally disengaged (Neutral) would it be in may I ask. . .

. . . rolling down the road - it's in either 4WD Auto / 4WD Low / 4WD High
Maybe ours are different, but they have AWD, 4WD high, and 4WD low.
 

BDS TRX

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Maybe ours are different, but they have AWD, 4WD high, and 4WD low.

Really? Cuz' page 31 in your RAM manual says different.


BorgWarnerControl.jpg
 

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If you eliminate what you do know, you can come up with a solution.

We all have an acoustic windshield, ANC, and no values in the exhaust system. To my ears I could barely hear my exhaust no matter what mode I'm in inside. After getting exhaust cutouts, the ANC can't mute enough of the sound. Baja, sport, and auto sound slight different but I would say it's only because of the drive modes manipulate the timing and shifting to make it sound different.
 
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