Another Interesting Observation, Exhaust Sound, M235i

todd hollander · 05-03-2015, 08:03 AM

Like a previous poster I want to enjoy the pops and crackles with throttle lift off after downshifting and have made an interesting observation.
It's definitely not just the exhaust system. Here goes.........
When in neutral, when the motor is up to operating temperature, if I put the car in sport mode and rev, I get nice pops and crackles. If I put it in comfort mode, the pops and crackles are greatly reduced. I just completed the exhaust valve mod by disconnecting the electrical connection to the exhaust valve actuator when the valve was open. (car off in sport mode, flashlight inspection confirms valve is open). I now get exhaust flowing out of both pipes all the time, it sounds a tiny bit better, but definitely the same as before the mod in regards to the pops and crackles in the two modes. I think the ECU changes the mixture or valve timing or something to make the exhaust sound more aggressive. This is irritating to me as another example of "synthesized" sound like playing it through the stereo. I think the pops and crackles are entirely synthetic. If I put an aftermarket exhaust on the car, will the exhaust sound be consistent between modes? I don't think so. What I want is to be able to drive in comfort mode with a nice exhaust sound without having it be extra loud or even change in sport mode. It seems the pops and crackles are a function of the ECU. Anybody with real world aftermarket (even MPerf) observations on this point?
TIA

Supernaut · 05-03-2015, 09:11 AM

It's definitely more burbly in Sport mode. The mapping changes plus non-linear throttle may let more unburnt fuel through when letting off the throttle. It's certainly not artificial in the same sense that Active Sound is. I love it.

todd hollander · 05-03-2015, 03:38 PM

Quote:

Originally Posted by Supernaut

It's definitely more burbly in Sport mode. The mapping changes plus non-linear throttle may let more unburnt fuel through when letting off the throttle. It's certainly not artificial in the same sense that Active Sound is. I love it.

I love it too, but I would like it in comfort mode.

durangodoug · 05-06-2015, 03:48 PM

Hey Todd have you put the car into DSC OFF mode and heard the exhaust? I feel like the exhaust is way louder when in that mode compared to comfort, and it doesn't sound synthetic to me. Try it out if you have a chance.

todd hollander · 05-06-2015, 07:50 PM

Quote:

Originally Posted by durangodoug

Hey Todd have you put the car into DSC OFF mode and heard the exhaust? I feel like the exhaust is way louder when in that mode compared to comfort, and it doesn't sound synthetic to me. Try it out if you have a chance.

Will do..........that would be a really good solution as I rarely need the DSC
Thanks,

Xiaoxi · 05-06-2015, 09:25 PM

Quote:

Originally Posted by durangodoug

Hey Todd have you put the car into DSC OFF mode and heard the exhaust? I feel like the exhaust is way louder when in that mode compared to comfort, and it doesn't sound synthetic to me. Try it out if you have a chance.

Interesting...

So you're saying that, with the drivetrain in comfort, if I enable DSC OFF, the exhaust will be louder and both exhausts are utilized? Does this affect mpg?

BMW335iOn18s · 05-06-2015, 09:57 PM

Yes, DSC OFF mode turns on the loud exhaust mode WITHOUT making the throttle more sensitive so it wouldn't have an impact on MPG.

alz0rz · 05-06-2015, 10:03 PM

It'll have an effect on MPG because you're going to be mashing on the throttle more listening for the burble (and to take advantage of the much more peppy throttle, if in Sport).

pikcachu · 05-06-2015, 11:03 PM

Quote:

Originally Posted by Xiaoxi

Interesting...

So you're saying that, with the drivetrain in comfort, if I enable DSC OFF, the exhaust will be louder and both exhausts are utilized? Does this affect mpg?

DSC OFF is a drive mode on itself...
there is not such thing as comfort & DSC OFF... or sport & DSC OFF...

look it as ECO PRO - COMFORT - SPORT - SPORT+ - DSC OFF

DSC OFF = sport steering/suspension, comfort throttle, louder exhaust with ASD, eDiff on, no stability control

pikcachu · 05-06-2015, 11:07 PM

Quote:

Originally Posted by alz0rz

It'll have an effect on MPG because you're going to be mashing on the throttle more listening for the burble (and to take advantage of the much more peppy throttle, if in Sport).

you might get worse mpg because of mashing the throttle but you can't get sport throttle with DSC OFF...

Even if you are in sport and you hold DSC for 5 secs and display shows "sport and DSC off" you are not in sport mode anymore... (no idea why they did this)... try it and you will see throttle goes back to comfort throttle with DSC OFF

Xiaoxi · 05-06-2015, 11:33 PM

Quote:

Originally Posted by pikcachu

DSC OFF is a drive mode on itself...
there is not such thing as comfort & DSC OFF... or sport & DSC OFF...

look it as ECO PRO - COMFORT - SPORT - SPORT+ - DSC OFF

DSC OFF = sport steering/suspension, comfort throttle, louder exhaust with ASD, eDiff on, no stability control

THIS JUST MADE MY NIGHT!!!

When I'm not driving in EP, I'm in Sport (chassis only), and there I always wished the exhaust was more present.

This does all of that!!

I just need to be more careful without the nannies

pikcachu · 05-06-2015, 11:46 PM

Quote:

Originally Posted by Xiaoxi

THIS JUST MADE MY NIGHT!!!

When I'm not driving in EP, I'm in Sport (chassis only), and there I always wished the exhaust was more present.

This does all of that!!

I just need to be more careful without the nannies

Just make sure it's not damp..... we don't want to see M235 jumping curbs like the M4

Xiaoxi · 05-06-2015, 11:48 PM

"A mistake was made..."

Xiaoxi · 05-08-2015, 10:24 PM

Just an update on this, but I've been driving as I normally, except instead of switching to Sport (Chassis Only) I switch to DSC OFF. Gas mileage seem to be within usual figures. This is over the course of 2 days.

I'll have to compare a full tank run to really get a better idea though. Should take about a week.

bladeomatic · 05-09-2015, 10:41 AM

Quote:

Originally Posted by pikcachu

Just make sure it's not damp..... we don't want to see M235 jumping curbs like the M4

No sh##!

I have one street that I turn on right before getting home. The car is usually nice and warm by then and there are no occupants or pedestrians on the street. As I turn left on it in Sport+ I can usually goose the throttle and lightly punch the tail out. Very fun, easy to control.

One of the 1st times I did the same with the DSC off, I was in for a surprise. Back end went on a wicked little ride of it's own! Those nannies are there for a reason. Obviously on track, this is the only way to go, but on streets, I need to be very focused if I'm going to be switching DSC off.

05-03-2015, 08:03 AM	#1
todd hollander Second Lieutenant 97 Rep 284 Posts Drives: X3 30i Join Date: Dec 2011 Location: Emmaus, PA iTrader: (0)	Another Interesting Observation, Exhaust Sound, M235i Like a previous poster I want to enjoy the pops and crackles with throttle lift off after downshifting and have made an interesting observation. It's definitely not just the exhaust system. Here goes......... When in neutral, when the motor is up to operating temperature, if I put the car in sport mode and rev, I get nice pops and crackles. If I put it in comfort mode, the pops and crackles are greatly reduced. I just completed the exhaust valve mod by disconnecting the electrical connection to the exhaust valve actuator when the valve was open. (car off in sport mode, flashlight inspection confirms valve is open). I now get exhaust flowing out of both pipes all the time, it sounds a tiny bit better, but definitely the same as before the mod in regards to the pops and crackles in the two modes. I think the ECU changes the mixture or valve timing or something to make the exhaust sound more aggressive. This is irritating to me as another example of "synthesized" sound like playing it through the stereo. I think the pops and crackles are entirely synthetic. If I put an aftermarket exhaust on the car, will the exhaust sound be consistent between modes? I don't think so. What I want is to be able to drive in comfort mode with a nice exhaust sound without having it be extra loud or even change in sport mode. It seems the pops and crackles are a function of the ECU. Anybody with real world aftermarket (even MPerf) observations on this point? TIA
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05-03-2015, 09:11 AM	#2
Supernaut Little Deuce Coupe 391 Rep 635 Posts Drives: SO M2C Join Date: Sep 2014 Location: Virginia Beach iTrader: (0) Garage List 2020 BMW M2 competi ... [0.00]	It's definitely more burbly in Sport mode. The mapping changes plus non-linear throttle may let more unburnt fuel through when letting off the throttle. It's certainly not artificial in the same sense that Active Sound is. I love it. __________________ ex: 2004 Thermonuclear Yellow RX-8\|6MT ex: 2015 Estoril Blue M235i \|6MT\|slicktop\|MP exhaust - PCD 2020 Sunset Orange M2C\|6MT\|Black 788s
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05-06-2015, 03:48 PM	#4
durangodoug Enlisted Member 12 Rep 38 Posts Drives: BMW M235i Join Date: Nov 2014 Location: Atlanta iTrader: (0)	Hey Todd have you put the car into DSC OFF mode and heard the exhaust? I feel like the exhaust is way louder when in that mode compared to comfort, and it doesn't sound synthetic to me. Try it out if you have a chance. __________________ Black and mild...
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05-06-2015, 09:57 PM	#7
BMW335iOn18s Resident BMW Fanboy 259 Rep 866 Posts Drives: F82 CS SMB Join Date: Jul 2007 Location: Philadelphia, PA iTrader: (0)	Yes, DSC OFF mode turns on the loud exhaust mode WITHOUT making the throttle more sensitive so it wouldn't have an impact on MPG. __________________ Current: '20 F82 M4cs SMB / '13 640i M-Sport Carbon Black Past: F30 330xi Luxury Line / F22 M235i 6MT / E92 335i / E46 330ci / E36 328i 5MT
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05-06-2015, 10:03 PM	#8
alz0rz What goes here? 452 Rep 1,356 Posts Drives: 2019 G30 M550i Join Date: Aug 2011 Location: Florida Space Coast iTrader: (4) Garage List 2019 BMW M550i [0.00] 2021 BMW M3 Competi ... [0.00] 2019 BMW M5 Competi ... [0.00] 2016 BMW M3 [0.00] 2014 BMW M235i [0.00]	It'll have an effect on MPG because you're going to be mashing on the throttle more listening for the burble (and to take advantage of the much more peppy throttle, if in Sport). __________________ 2019 G30 M550i GBNF: 2021 G80 M3, 2019 F90 M5 Competition, 2016 F80 M3, 2014 F22 M235i
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05-06-2015, 11:48 PM	#13
Xiaoxi Lieutenant 269 Rep 470 Posts Drives: a Miata Join Date: Jul 2014 Location: DC metro iTrader: (0)	"A mistake was made..." __________________ 2015 M235i \| AW \| 6MT \| Tech \| Heated Seat \| Parking Assist \| Fabspeed DP & Muffler Delete \| Apex PS7s 1999 MX5 NB \| Emerald Mica \| 5MT \| Sport Edition \| Kosei K5Rs \| Heated Rear Glass ig: @bee2ven
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05-08-2015, 10:24 PM	#14
Xiaoxi Lieutenant 269 Rep 470 Posts Drives: a Miata Join Date: Jul 2014 Location: DC metro iTrader: (0)	Just an update on this, but I've been driving as I normally, except instead of switching to Sport (Chassis Only) I switch to DSC OFF. Gas mileage seem to be within usual figures. This is over the course of 2 days. I'll have to compare a full tank run to really get a better idea though. Should take about a week. __________________ 2015 M235i \| AW \| 6MT \| Tech \| Heated Seat \| Parking Assist \| Fabspeed DP & Muffler Delete \| Apex PS7s 1999 MX5 NB \| Emerald Mica \| 5MT \| Sport Edition \| Kosei K5Rs \| Heated Rear Glass ig: @bee2ven
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