M140i cold start

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Spoof
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M140i cold start

Post by Spoof » Sat Feb 17, 2018 8:07 pm

I'm sure one of the more technical minded on here will know the answer.

Why when I press the throttle very lightly on the cold start , does it turn the exhaust volume back to its idle volume. You can actually hear something in the engine compartment move (egr perhaps?)

I've found it a very handy trick with the MPE and early starts. It helps with neighbour relations.

Glund91
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Re: M140i cold start

Post by Glund91 » Sat Feb 17, 2018 8:13 pm

Not technically minded but something to do with waste gate. Something like it opens up for the cold start but closes when you press on the throttle and it is the open waste gate that gives the increased noise?

I am sure someone will be along with a proper explanation but that is what I have gathered atm.
M140i Shadow in SO w/ MPE

kylemacca01
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Re: M140i cold start

Post by kylemacca01 » Sat Feb 17, 2018 11:14 pm

Glund91 wrote:
Sat Feb 17, 2018 8:13 pm
Not technically minded but something to do with waste gate. Something like it opens up for the cold start but closes when you press on the throttle and it is the open waste gate that gives the increased noise?

I am sure someone will be along with a proper explanation but that is what I have gathered atm.
Yeah this^

Waste gate fully open to speed up warming the cat. Bit of throttle closes the wastegate.

I really wish bmws didnt have these OTT cold start sequences, with a performance exhaust they are just obnoxiously loud for 30s for minimal/zero benefit.

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RDowson
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Re: M140i cold start

Post by RDowson » Mon Feb 19, 2018 3:07 pm

I like the loud start but not at 7am when I'm heading out to work. I wish there was a way you could set it not to do it at certain times.

I know there is another car that lets you select a window for quiet starts. It was on an episode of the Grand Tour.
M140i Shadow Edition - Sunset Orange - M Performance Exhaust - Front Silencer Delete - Bimecc Spacers - Bluespark - Motech Eibach Springs - MP Bump Stops - MP Discs - Goodridge Lines - Powerflex Inserts - Underbelly Brace - Pipercross Filter

Glund91
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Re: M140i cold start

Post by Glund91 » Mon Feb 19, 2018 3:24 pm

RDowson wrote:
Mon Feb 19, 2018 3:07 pm
I like the loud start but not at 7am when I'm heading out to work. I wish there was a way you could set it not to do it at certain times.

I know there is another car that lets you select a window for quiet starts. It was on an episode of the Grand Tour.
I might be wrong but was that the Mustang? Called Neighbour mode or something?
M140i Shadow in SO w/ MPE

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RDowson
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Re: M140i cold start

Post by RDowson » Mon Feb 19, 2018 3:25 pm

Glund91 wrote:
Mon Feb 19, 2018 3:24 pm
RDowson wrote:
Mon Feb 19, 2018 3:07 pm
I like the loud start but not at 7am when I'm heading out to work. I wish there was a way you could set it not to do it at certain times.

I know there is another car that lets you select a window for quiet starts. It was on an episode of the Grand Tour.
I might be wrong but was that the Mustang? Called Neighbour mode or something?
That sounds about right.
M140i Shadow Edition - Sunset Orange - M Performance Exhaust - Front Silencer Delete - Bimecc Spacers - Bluespark - Motech Eibach Springs - MP Bump Stops - MP Discs - Goodridge Lines - Powerflex Inserts - Underbelly Brace - Pipercross Filter

Glund91
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Re: M140i cold start

Post by Glund91 » Mon Feb 19, 2018 3:26 pm

Agree it would be useful for the mornings. Setting off to work at 6:30 with MPE and res delete is a little awkward. Also anywhere enclosed like multistory car parks are a bit excessive.
M140i Shadow in SO w/ MPE

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