X3 M40i Exhaust Mod

MrAH · 10-13-2018, 03:58 PM

Quote:

Originally Posted by Kief

Thanks.
I finally got off my lazy butt to take a look under the car, and it's as you described. After covering the plug, did you tape it up onto the heat shield to keep it from swaying or just leave it as is--hanging loose? Also, are you experiencing any drone, or is it too annoying sound-wise if you ever opted to drive in comfort mode--but who does that?!?!

With my M3, I never found the need to permanently disable the flap, b/c of the sport/sport+ button which makes it easy to open/close.

So I did see this when I got under the car (the plug) but it felt like it was on there very tightly. How exactly do you pull this off? Is there any tab you have to press, or is it literally just a strong pull? Thank you!

MrAH · 10-13-2018, 09:55 PM

Quote:

Originally Posted by Kief

Thanks.
I finally got off my lazy butt to take a look under the car, and it's as you described. After covering the plug, did you tape it up onto the heat shield to keep it from swaying or just leave it as is--hanging loose? Also, are you experiencing any drone, or is it too annoying sound-wise if you ever opted to drive in comfort mode--but who does that?!?!

With my M3, I never found the need to permanently disable the flap, b/c of the sport/sport+ button which makes it easy to open/close.

Hi, I have the X3 m40 as well, and I tried to yank that same connection out from under the car but I cannot get unplug it... Am I just not pulling hard enough or is there a latch or something I need to push? Thank you!

Kief · 10-14-2018, 02:19 AM

Quote:

Originally Posted by MrAH

So I did see this when I got under the car (the plug) but it felt like it was on there very tightly. How exactly do you pull this off? Is there any tab you have to press, or is it literally just a strong pull? Thank you!

Quote:

Originally Posted by MrAH

Hi, I have the X3 m40 as well, and I tried to yank that same connection out from under the car but I cannot get unplug it... Am I just not pulling hard enough or is there a latch or something I need to push? Thank you!

I PM'd you back, but I remember a tab needing to be depressed. I no longer have my X3 so I can't go and check.
GL

MrAH · 10-15-2018, 08:11 PM

I finally did mine today and compared to other videos of BMWs, I was blown away with the results. The M40i screamed after the left exhaust was open during startup. I think the left exhaust lacks a little sound dampening since the left exhaust definitely had more "clipping" with the noise and it seemed to be even louder than the right one. The gurgles that followed were amazing.

j3rmyn · 12-28-2018, 05:40 PM

Quote:

Originally Posted by MrAH

I finally did mine today and compared to other videos of BMWs, I was blown away with the results. The M40i screamed after the left exhaust was open during startup. I think the left exhaust lacks a little sound dampening since the left exhaust definitely had more "clipping" with the noise and it seemed to be even louder than the right one. The gurgles that followed were amazing.

Quote:

Originally Posted by MrAH

I finally did mine today and compared to other videos of BMWs, I was blown away with the results. The M40i screamed after the left exhaust was open during startup. I think the left exhaust lacks a little sound dampening since the left exhaust definitely had more "clipping" with the noise and it seemed to be even louder than the right one. The gurgles that followed were amazing.

Can you post pics or video of this? I'm trying to do this myself.

supersebbo · 01-22-2019, 09:08 AM

I've been looking through a few technical docs related to this system. I believe it should be possible to keep the flap open a with a fuse-pull rather than disconnecting the module entirely.

This document describes the function of module Y42a (Electrical Exhaust Flap). According to the fuse board wiring, module Y42a is the only circuit serviced by fuse F203.

Now, as the unit is a PWM driven servo, it will fail in its current state if the power is removed. So you would need to use BimmerLink or another method to make sure the flap is opened when you pull the fuse.

Upon fuse replacement it should revert to the commanded position.

The document also confirms the flap position is driven by the following inputs (and not strictly driving mode):

Engine speed
Load
Driving speed

j1980mac · 01-22-2019, 09:24 AM

Or you could just spend $25 and get the Bimmer App?

:

Kozumasbullitt · 01-22-2019, 09:36 AM

So what's the verdict on this? Does the exhaust flap need to be open before unplug the connector to keep it always open? I purchased the cheater plug BMW sells for that solenoid and want to be sure I am not permanently closing the flap.

supersebbo · 01-22-2019, 09:45 AM

Quote:

Originally Posted by j1980mac

Or you could just spend $25 and get the Bimmer App?

:

The app doesn't permanently code it. It's a pain to have to boot up the app, sync with the adapter and change the setting every time you want to drive.

It resets to default on each restart.

SC11 · 01-22-2019, 10:02 AM

Quote:

Originally Posted by supersebbo

The app doesn't permanently code it. It's a pain to have to boot up the app, sync with the adapter and change the setting every time you want to drive.

It resets to default on each restart.

How is that the case if the only way to turn it back on once deactivated is via the back up?

therealtk · 01-22-2019, 11:14 AM

Quote:

Originally Posted by SC11

How is that the case if the only way to turn it back on once deactivated is via the back up?

with Bimmerlink, the app blocks out/overrides the signal to the exhaust valve temporarily via the OBD port/app connection to the selected state in the app. As soon as you shut off the car and remove the bimmerlink BT connection it goes back to the normal operating parameters. I bought the app and then returned it because it didn't permanently set it open and remember it.

SC11 · 01-22-2019, 11:27 AM

Quote:

Originally Posted by therealtk

with Bimmerlink, the app blocks out/overrides the signal to the exhaust valve temporarily via the OBD port/app connection to the selected state in the app. As soon as you shut off the car and remove the bimmerlink BT connection it goes back to the normal operating parameters. I bought the app and then returned it because it didn't permanently set it open and remember it.

My bad I’m referring to coding the car to start in a preset mode ie Sports plus

supersebbo · 01-22-2019, 11:28 AM

Quote:

Originally Posted by SC11

How is that the case if the only way to turn it back on once deactivated is via the back up?

I am happy to be corrected but I believe it is not possible to 'code' the flap using BimmerCode (or any FSD coding tool). With BimmerLink you can turn it on and off using the app, but that only works while the app is open on your phone. They are different.

Ah someone beat me to it ^^^^

nvestr · 01-22-2019, 12:21 PM

I, too, would love to see a comparison video comparing with flap open and closed. Anybody care to make one? I don't have my M40i yet so can't try it obviously

.

supersebbo · 01-22-2019, 01:05 PM

Quote:

Originally Posted by Kozumasbullitt

So what's the verdict on this? Does the exhaust flap need to be open before unplug the connector to keep it always open? I purchased the cheater plug BMW sells for that solenoid and want to be sure I am not permanently closing the flap.

The documentation suggests so. According to the functional description the servo will fail 'open' if the PWM signal fails, however if the power is removed then it will stay in whatever position it was in.

808ron · 01-22-2019, 02:06 PM

Quote:

Originally Posted by Kozumasbullitt

So what's the verdict on this? Does the exhaust flap need to be open before unplug the connector to keep it always open? I purchased the cheater plug BMW sells for that solenoid and want to be sure I am not permanently closing the flap.

What's the part number for the cheater plug?

supersebbo · 01-22-2019, 02:17 PM

Quote:

Originally Posted by 808ron

What's the part number for the cheater plug?

Before you spend money on the cheater plug, I would just try pulling fuse F203 in the rear fuse panel. All the cheater plug does is provide a mechanical place to stow the connector if you disconnect it. Pulling the fuse should achieve the same for free.

therealtk · 01-22-2019, 02:25 PM

anyone want to try this one out? could program the home link button as well...

https://www.ecstuning.com/b-cg-preci.../0001vsc1~cgp/

(for f30 340i B58)

808ron · 01-22-2019, 02:36 PM

Quote:

Originally Posted by supersebbo

Before you spend money on the cheater plug, I would just try pulling fuse F203 in the rear fuse panel. All the cheater plug does is provide a mechanical place to stow the connector if you disconnect it. Pulling the fuse should achieve the same for free.

Ha totally missed your post. I see, have you tried it yet? So I should have Bimmercode open it, then pull plug for the solenoid so it stays open. Turn off the car, pull the fuse, the plug the solenoid back in. Seeing as to the exhaust being warm and in sports plus doesn't guarantee the flap is open fully upon pulling solenoid. Now i need to get Bimmercode. Would prefer not to be the guinea pig on this but might be. Thanks for the research above!

supersebbo · 01-22-2019, 02:41 PM

Quote:

Originally Posted by therealtk

anyone want to try this one out? could program the home link button as well...

https://www.ecstuning.com/b-cg-preci.../0001vsc1~cgp/

(for f30 340i B58)

Looks great but that is pricey for the feature. For ~$50 you can get the same functionality from an OBDII + BimmerLink combo.

If you want anything more permanent, I would suggest pulling the fuse.

supersebbo · 01-22-2019, 02:43 PM

Quote:

Originally Posted by nvestr

I, too, would love to see a comparison video comparing with flap open and closed. Anybody care to make one? I don't have my M40i yet so can't try it obviously

.

Pretty good audible comparison here, this is with the Juice Box JB4 system (note: not currently working with G01 digital dash)

therealtk · 01-22-2019, 02:49 PM

Quote:

Originally Posted by supersebbo

Looks great but that is pricey for the feature. For ~$50 you can get the same functionality from an OBDII + BimmerLink combo.

If you want anything more permanent, I would suggest pulling the fuse.

I agree with you on the fuse as long as there are no ill effects to other systems - but i thought the VSC1 system is good for those with sensitive neighbors/HOA fines...

10-15-2018, 08:11 PM	#48
MrAH New Member 2 Rep 13 Posts Drives: X3 M40i Join Date: Oct 2018 Location: Toronto iTrader: (0)	"Golf Tee Mod" for X3 M40i I finally did mine today and compared to other videos of BMWs, I was blown away with the results. The M40i screamed after the left exhaust was open during startup. I think the left exhaust lacks a little sound dampening since the left exhaust definitely had more "clipping" with the noise and it seemed to be even louder than the right one. The gurgles that followed were amazing.
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01-22-2019, 09:08 AM	#50
supersebbo First Lieutenant 234 Rep 366 Posts Drives: iX3 Premier Pro (Dec 21) Join Date: Mar 2013 Location: UK iTrader: (0)	I've been looking through a few technical docs related to this system. I believe it should be possible to keep the flap open a with a fuse-pull rather than disconnecting the module entirely. This document describes the function of module Y42a (Electrical Exhaust Flap). According to the fuse board wiring, module Y42a is the only circuit serviced by fuse F203. Now, as the unit is a PWM driven servo, it will fail in its current state if the power is removed. So you would need to use BimmerLink or another method to make sure the flap is opened when you pull the fuse. Upon fuse replacement it should revert to the commanded position. The document also confirms the flap position is driven by the following inputs (and not strictly driving mode): Engine speed Load Driving speed
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01-22-2019, 09:24 AM	#51
j1980mac Captain 263 Rep 964 Posts Drives: 2018 X3 M40i Join Date: Apr 2018 Location: Austin TX iTrader: (0)	Or you could just spend $25 and get the Bimmer App? :
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01-22-2019, 09:36 AM	#52
Kozumasbullitt Lieutenant 370 Rep 483 Posts Drives: 21 X3MC Join Date: Jan 2019 Location: Bay Area, CA iTrader: (0)	So what's the verdict on this? Does the exhaust flap need to be open before unplug the connector to keep it always open? I purchased the cheater plug BMW sells for that solenoid and want to be sure I am not permanently closing the flap.
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01-22-2019, 12:21 PM	#58
nvestr First Lieutenant 150 Rep 301 Posts Drives: 2019 BMW X3 M40i - Sold Join Date: Nov 2018 Location: Canada iTrader: (0) Garage List 2019 Volvo XC90 T6 ... [0.00]	I, too, would love to see a comparison video comparing with flap open and closed. Anybody care to make one? I don't have my M40i yet so can't try it obviously . __________________ 2023 BMW X7 40i // Mineral White // Silverstone Sensafin // MSport Pro + Performance Enhanced 2020 BMW X6 M50i // Alpine White // Mocha Vernasca // Performance Enhanced 2019 BMW X3 M40i // Alpine White // Cognac Vernasca - SOLD
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01-22-2019, 02:25 PM	#62
therealtk Private 64 Rep 72 Posts Drives: '12 E92 ZCP Join Date: Nov 2018 Location: Geneva, IL iTrader: (0)	anyone want to try this one out? could program the home link button as well... https://www.ecstuning.com/b-cg-preci.../0001vsc1~cgp/ (for f30 340i B58) Last edited by therealtk; 01-22-2019 at 02:35 PM..
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