M340i - controlling the exhaust valve.

Carbon dude · 02-25-2023, 07:50 AM

Quote:

Originally Posted by dpazz

LCI owners, if you look under the exhaust at the rear driver's side you'll see a big circlip. Open the valve by selecting sport or sport plus, then remove the circlip and you'll have permanent open valve without coding.

Can easily refix circlip at any time to restore valve operation. It's like BMW have thought about people like us

I second this method. Wrap some electrical insulation tape around it to keep it clean of grim etc. I've had mine like that for over a year and no issues.

Bianchi Dave · 02-25-2023, 10:34 AM

Quote:

Originally Posted by Carbon dude

I second this method. Wrap some electrical insulation tape around it to keep it clean of grim etc. I've had mine like that for over a year and no issues.

Are you LCI also, or pre LCI but MHT?

G50 · 02-26-2023, 04:33 AM

Quote:

Originally Posted by sjb993

Yes, still working and I haven't had any problems at all

OP, would you be able to offer your thoughts on 540i vs m340i, positives, negatives, and whether you modified the g30?

Carbon dude · 02-26-2023, 07:50 AM

Quote:

Originally Posted by Bianchi Dave

Are you LCI also, or pre LCI but MHT?

Pre LCI and MHT

sjb993 · 02-26-2023, 07:54 AM

G50,

I had two G30 540is, and I didn’t modify either of them. Very nice cars and I couldn’t really fault them. I didn’t need such a big car, and that’s the main reason I went for a 3 series. I loved the B58 engine, hence the M340i Xdrive.

I think the interior is the same as the 5’s in terms of quality. In terms of size I don’t feel the driver and passenger space is very different. Rear leg room is smaller, but 99% of the time it’s just me and my wife in the car so that’s not an issue. Boot space is also smaller, but it’s more than adequate for my needs.

In terms of driving comfort, the 3 perhaps gives a slightly firmer ride in COMFORT mode. There is perhaps a little more road noise (the 5s and 3 had/have runflats).

In terms of driving feeling, the 5s were a bit more “wallowly”. I love the sports steering in the 3, and it is a lot more fun round the country lanes.

Would I go back to a 5? No.

But, as everyone always says, you’ll need to try one so you can find out which you prefer.

Bianchi Dave · 02-26-2023, 09:22 AM

Quote:

Originally Posted by Carbon dude

Pre LCI and MHT

Thanks. The exhaust is very muted in comfort so I'll have a look

DNB_Perth · 03-17-2023, 10:31 AM

In my Australian delivered (June/July 2020 Build) M340i xDrive, I have pulled out the F203 7.5A fuse from the rear (boot) fuse box to leave the Exhaust Valve permanently open, it has been out for a couple of months now and I have had no issues.

RedSox · 03-19-2023, 04:07 AM

Quote:

Originally Posted by sjb993

I uncode it before taking it.

Do you happen to know if the backup option allows you to 'roll back' an upgrade if it goes wrong somehow?

I'm about to bite the bullet and code mine and am a tad nervous just in case it goes wrong!!

sjb993 · 03-19-2023, 08:26 AM

I believe there is the option to roll back any updates, but I have never had the need to use it, so I can't comment on the reliability of that feature.

Maybe you should try a new thread to ask people of their experiences with Bimmercode roll back. I'd also post it on the "General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions" so it gets to a larger Bimmercode user base.

RedSox · 03-19-2023, 08:58 AM

Quote:

Originally Posted by RedSox

Do you happen to know if the backup option allows you to 'roll back' an upgrade if it goes wrong somehow?

I'm about to bite the bullet and code mine and am a tad nervous just in case it goes wrong!!

All done and working - so far!!

sjb993 · 03-19-2023, 09:19 AM

It’ll be fine, I’ve never had any problems coding/uncoding various features with Bimmercode.

NLJ · 03-26-2023, 03:13 PM

Quote:

Originally Posted by DNB_Perth

In my Australian delivered (June/July 2020 Build) M340i xDrive, I have pulled out the F203 7.5A fuse from the rear (boot) fuse box to leave the Exhaust Valve permanently open, it has been out for a couple of months now and I have had no issues.

Did you have to put it in Sports mode before you pulled it out?

AshM340i · 04-11-2023, 12:04 PM

In my G21 330e I coded it and then pulled the plug whilst it was open.
Put a little wrap bag around it and used a plasti-tie to seal and secure it up out of the way.

Was going to do this on the G20 M340d that I just got, but even in comfort mode (default) I can feel equal flow/heat coming from both exhausts, so I am not sure if the M340d even closes one pipe off???

Its brand new 73 plate but the last of the non LCI, as I wanted buttons and a gear lever

sjb993 · 04-11-2023, 12:47 PM

Have a look down the tailpipe on the driver's side and you'll see whether the valve is open or closed.

willougs · 04-11-2023, 01:03 PM

Quote:

Originally Posted by AshM340d

Its brand new 73 plate but the last of the non LCI, as I wanted buttons and a gear lever

You sure about that?

AshM340i · 04-11-2023, 05:16 PM

Quote:

Originally Posted by willougs

You sure about that?

Sure it’s new or sure I wanted buttons 🤣

EDIT: 🤦 just realised I put 73 not 23 🤣🤣 FML

AshM340i · 04-13-2023, 12:49 PM

Quote:

Originally Posted by sjb993

Have a look down the tailpipe on the driver's side and you'll see whether the valve is open or closed.

Took a look tonight, now the rain has stopped, defo no valve on drivers side on the M340d.
No change in flow or noise when changed from comfort to Sport+.

See pics.

2nd is driver side (looks a bit darker, but same curve and no valve as passenger), 3rd is passenger.

sjb993 · 04-13-2023, 01:28 PM

That's interesting. Maybe the 340d doesn't have the valve. Here's my 340i with the valve closed and open.

AshM340i · 04-14-2023, 05:19 AM

Quote:

Originally Posted by sjb993

That's interesting. Maybe the 340d doesn't have the valve. Here's my 340i with the valve closed and open.

That's what I am thinking, thanks for the pics of yours for comparison 👍

sjb993 · 04-14-2023, 07:12 AM

Another M340d owner might be along shortly to confirm or refute.

AshM340i · 04-14-2023, 10:36 AM

Be good if they could, I had another look this morning with my head torch, can see right up into the bend and there is 100% not a valve on the bend like yours.
I looked underneath the car at the whole back exhaust assembly and can't see any wiring or plug that could be removed/control a flap deeper within the back box.

dmunozj · 06-02-2023, 08:38 PM

Quote:

Originally Posted by sjb993

225 - is yours a G20 M340i? If not, I don’t think it will work.

As I understand it, it only works on G20 M340i and G20 330e. I’ve also read that it’s a standard iDrive menu option in G30 M550i.

Does it work with Idrive 8???

02-26-2023, 07:54 AM	#49
sjb993 Captain 248 Rep 664 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	G50, I had two G30 540is, and I didn’t modify either of them. Very nice cars and I couldn’t really fault them. I didn’t need such a big car, and that’s the main reason I went for a 3 series. I loved the B58 engine, hence the M340i Xdrive. I think the interior is the same as the 5’s in terms of quality. In terms of size I don’t feel the driver and passenger space is very different. Rear leg room is smaller, but 99% of the time it’s just me and my wife in the car so that’s not an issue. Boot space is also smaller, but it’s more than adequate for my needs. In terms of driving comfort, the 3 perhaps gives a slightly firmer ride in COMFORT mode. There is perhaps a little more road noise (the 5s and 3 had/have runflats). In terms of driving feeling, the 5s were a bit more “wallowly”. I love the sports steering in the 3, and it is a lot more fun round the country lanes. Would I go back to a 5? No. But, as everyone always says, you’ll need to try one so you can find out which you prefer.
	Appreciate 2 G501189.50 Davg31117.50 Quote

03-17-2023, 10:31 AM	#51
DNB_Perth Enlisted Member 15 Rep 44 Posts Drives: prev M340i, now i20N, soon M2 Join Date: Jan 2023 Location: Perth (SOR), Western Australia iTrader: (0)	In my Australian delivered (June/July 2020 Build) M340i xDrive, I have pulled out the F203 7.5A fuse from the rear (boot) fuse box to leave the Exhaust Valve permanently open, it has been out for a couple of months now and I have had no issues. __________________ Current: 2025 Hyundai i20N Previously: 2020 BMW M340i XDrive in Arctic White, MHD Stage 2 Tune, xHP Stage 3, Active Autowerke Catted Downpipe, MST Intake, H&R Springs etc Next: 2025 G87 M2 ???
	Appreciate 1 Bianchi Dave431.50 Quote

03-19-2023, 08:26 AM	#53
sjb993 Captain 248 Rep 664 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	I believe there is the option to roll back any updates, but I have never had the need to use it, so I can't comment on the reliability of that feature. Maybe you should try a new thread to ask people of their experiences with Bimmercode roll back. I'd also post it on the "General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions" so it gets to a larger Bimmercode user base.
	Appreciate 0 Quote

03-19-2023, 09:19 AM	#55
sjb993 Captain 248 Rep 664 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	It’ll be fine, I’ve never had any problems coding/uncoding various features with Bimmercode.
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04-11-2023, 12:04 PM	#57
AshM340i New Member 6 Rep 20 Posts Drives: G21 M340i Join Date: Nov 2021 Location: Wales iTrader: (0)	In my G21 330e I coded it and then pulled the plug whilst it was open. Put a little wrap bag around it and used a plasti-tie to seal and secure it up out of the way. Was going to do this on the G20 M340d that I just got, but even in comfort mode (default) I can feel equal flow/heat coming from both exhausts, so I am not sure if the M340d even closes one pipe off??? Its brand new 73 plate but the last of the non LCI, as I wanted buttons and a gear lever
	Appreciate 0 Quote

04-11-2023, 12:47 PM	#58
sjb993 Captain 248 Rep 664 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	Have a look down the tailpipe on the driver's side and you'll see whether the valve is open or closed.
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04-13-2023, 01:28 PM	#62
sjb993 Captain 248 Rep 664 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	That's interesting. Maybe the 340d doesn't have the valve. Here's my 340i with the valve closed and open. Attached Images Last edited by sjb993; 04-13-2023 at 01:42 PM..
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04-14-2023, 07:12 AM	#64
sjb993 Captain 248 Rep 664 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	Another M340d owner might be along shortly to confirm or refute.
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04-14-2023, 10:36 AM	#65
AshM340i New Member 6 Rep 20 Posts Drives: G21 M340i Join Date: Nov 2021 Location: Wales iTrader: (0)	Be good if they could, I had another look this morning with my head torch, can see right up into the bend and there is 100% not a valve on the bend like yours. I looked underneath the car at the whole back exhaust assembly and can't see any wiring or plug that could be removed/control a flap deeper within the back box.
	Appreciate 0 Quote