cold startup exhaust sound 50i

magna6882 · 01-01-2019, 09:15 PM

At startup the exhaust sounds really beefy then quiets down considerably almost to where i think the engine shut off. Is this the exhaust flap i have read about? If its open at startup can it just be unplugged when the engine is cold or is there a setting.

AndroidRobot · 01-01-2019, 09:40 PM

Quote:

Originally Posted by magna6882

At startup the exhaust sounds really beefy then quiets down considerably almost to where i think the engine shut off. Is this the exhaust flap i have read about? If its open at startup can it just be unplugged when the engine is cold or is there a setting.

No, it revs up to warm the cats then idles down, flaps are always closed at startup from what I've seen. One side also stays closed completely at startup for the above reason which could be why it sounds louder for cold starts

magna6882 · 01-01-2019, 11:25 PM

I think it sounds really cool. my other option was a gle63 but it just seemed small but i did like the sound and burble of the exhaust.

MystroX5 · 01-02-2019, 07:25 AM

Are you in “sport mode” when starting? Both sides are open in any temp starts.

Not my video but this is what “sport mode” sounds like on a cold start.

Update:

Here is one I just did with my phone:

AndroidRobot · 01-02-2019, 07:46 AM

Quote:

Originally Posted by MystroX5

Are you in "sport mode" when starting? Both sides are open in any temp starts.

Not my video but this is what "sport mode" sounds like on a cold start.

That's odd, in my M40i only one side is open during start up so it can warm up faster then both open when it's at temp and idles down. I figured since my car is a refreshed X3 the X5 would be the same. Thanks fo posting that, I will surely lean about my X5 whenever BMW feels it wants to make my Week 51 build...

kanvas · 01-02-2019, 03:18 PM

Does it have Active Sound?

AndroidRobot · 01-02-2019, 04:43 PM

Quote:

Originally Posted by kanvas

Does it have Active Sound?

All new BMWs do and have for some time.

MysticBlue · 01-02-2019, 05:13 PM

The startup sequence has been common to most, if not all BMW engines for quite some time now. It's purpose is to heat up the catalytic converters faster. Engine mapping is changed, timing is a little different, mixture is a little different, all to make the exhaust hotter, heating the cats up faster, because they don't do what they do until they are above a certain temperature.
This is not done because it sounds cool. It is not done with exhaust flaps, and the increased volume is not just because the idle is held at a slightly higher RPM. In fact, on my car, the idle is not changed at all, yet it is a lot louder for about 45 seconds on startup. Purely done with engine mapping and purely done for emissions reasons. And if you have fake sound piped through your speakers, this is not coming from that.

Nick M. · 01-02-2019, 09:01 PM

Quote:

Originally Posted by MystroX5

Are you in "sport mode" when starting? Both sides are open in any temp starts.

Not my video but this is what "sport mode" sounds like on a cold start.

Update:

Here is one I just did with my phone:

Both sides will open, but only one exhaust tip per side. On startup, one flap per side is closed regardless of sport or comfort.

You can see it on a cold morning.

r33_RGSport · 01-02-2019, 09:14 PM

It is the wastegates being opened so all the exhaust gas going straight to the catalytic to warming it up.
Not the muffler flap.

MystroX5 · 01-02-2019, 09:19 PM

Quote:

Originally Posted by Nick M.

Both sides will open, but only one exhaust tip per side. On startup, one flap per side is closed regardless of sport or comfort.

You can see it on a cold morning.

I just noticed that. Exhaust coming out of both sides but one pipe per side on cold start, (the two inside pipes). Then all 4 pipes open up when warm.

AndroidRobot · 01-02-2019, 09:46 PM

Quote:

Originally Posted by MystroX5

Quote:

Originally Posted by Nick M.

Both sides will open, but only one exhaust tip per side. On startup, one flap per side is closed regardless of sport or comfort.

You can see it on a cold morning.

I just noticed that. Exhaust coming out of both sides but one pipe per side on cold start, (the two inside pipes). Then all 4 pipes open up when warm.

what happened to the warm start video?

edit wrong op lol

magna6882 · 01-02-2019, 11:04 PM

Quote:

Originally Posted by MysticBlue

The startup sequence has been common to most, if not all BMW engines for quite some time now. It's purpose is to heat up the catalytic converters faster. Engine mapping is changed, timing is a little different, mixture is a little different, all to make the exhaust hotter, heating the cats up faster, because they don't do what they do until they are above a certain temperature.
This is not done because it sounds cool. It is not done with exhaust flaps, and the increased volume is not just because the idle is held at a slightly higher RPM. In fact, on my car, the idle is not changed at all, yet it is a lot louder for about 45 seconds on startup. Purely done with engine mapping and purely done for emissions reasons. And if you have fake sound piped through your speakers, this is not coming from that.

I have read about folks wanting to trick some type of flap to stay open. Is this something that pertains to me?

01-01-2019, 09:15 PM	#1
magna6882 First Lieutenant 168 Rep 374 Posts Drives: 2017 audi q7 Join Date: Jul 2018 Location: seattle iTrader: (0)	cold startup exhaust sound 50i At startup the exhaust sounds really beefy then quiets down considerably almost to where i think the engine shut off. Is this the exhaust flap i have read about? If its open at startup can it just be unplugged when the engine is cold or is there a setting.
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01-01-2019, 11:25 PM	#3
magna6882 First Lieutenant 168 Rep 374 Posts Drives: 2017 audi q7 Join Date: Jul 2018 Location: seattle iTrader: (0)	I think it sounds really cool. my other option was a gle63 but it just seemed small but i did like the sound and burble of the exhaust.
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01-02-2019, 07:25 AM	#4
MystroX5 Major General 6710 Rep 5,631 Posts Drives: X7M50i/911/GTI/PW Join Date: Dec 2018 Location: Central Pa. iTrader: (0)	Are you in “sport mode” when starting? Both sides are open in any temp starts. Not my video but this is what “sport mode” sounds like on a cold start. Update: Here is one I just did with my phone: Last edited by MystroX5; 01-02-2019 at 03:54 PM..
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01-02-2019, 03:18 PM	#6
kanvas Major 649 Rep 1,170 Posts Drives: V8 Join Date: Dec 2014 Location: Orange County, CA iTrader: (2)	Does it have Active Sound? __________________ 2001 X5 4.4i - sold but never forgotten! 2014 X5 xDrive50i
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01-02-2019, 05:13 PM	#8
MysticBlue Lieutenant Colonel 366 Rep 1,887 Posts Drives: '20 M5C, '09 M3 DCT Coupe Join Date: Apr 2008 Location: Eastern Oregon... They call 'em rigs here iTrader: (0)	The startup sequence has been common to most, if not all BMW engines for quite some time now. It's purpose is to heat up the catalytic converters faster. Engine mapping is changed, timing is a little different, mixture is a little different, all to make the exhaust hotter, heating the cats up faster, because they don't do what they do until they are above a certain temperature. This is not done because it sounds cool. It is not done with exhaust flaps, and the increased volume is not just because the idle is held at a slightly higher RPM. In fact, on my car, the idle is not changed at all, yet it is a lot louder for about 45 seconds on startup. Purely done with engine mapping and purely done for emissions reasons. And if you have fake sound piped through your speakers, this is not coming from that. __________________ M5C 20% tint, Xpel full front, partial sides and rear. Spacers, 15mm front, 12mm rear. Turner Motorsport Oil Cooler Guard. M3: Active Autowerke filter, Dinan underdrive pulley, Dinan full exhaust and software, 3.45 Differential, Springs, Brakes, Dinan/HRE wheels, 275/30-19 w/10mm spacer, 295/30-19 w/3mm spacer, painted front reflectors, 30% tint, Escort 8500i & Lidar Jammer, LUX H8 V5 halos, Euro rear foglights, 3M ClearBra.
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01-02-2019, 09:14 PM	#10
r33_RGSport General 13560 Rep 19,044 Posts Drives: G09 XM, G05 X5 40, 991.2 T Join Date: Oct 2009 Location: So. Cal iTrader: (6)	It is the wastegates being opened so all the exhaust gas going straight to the catalytic to warming it up. Not the muffler flap. __________________ Email:sales@rgsport.com \| IG:RGSport_USA \| Web:RGSportShop.com PM for Everyday DEAL!! \| Akrapovic 10% Off SALE until Oct 15th \| MSS SALE MSS • iSweep • RaceChip • Sterckenn • AutoTecknic • Akrapovic • Vossen Wheels • Eventuri Active Autowerke • KW • H&R • Ohlins • Remus • and more...
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