535i exhaust

Jon D · 09-12-2016, 11:30 AM

Got my new 640i (same engine as the 535) last week and have just noticed that the RH tailpipe is completely clean, whereas the LH shows signs of moderate usage. Also noticed that immediately after a run of 30 miles the the RH tailpipe is completely cold.
Still running-in and haven't exceeded 3k RPM so I'm guessing that it's a split system and that the other half only cuts in above a certain RPM. Looking underneath I notice a distinct difference in the mufflers - the LH is a large rectangular box and the RH is a tubular in-line unit. Can anyone confirm my reasoning or offer a different explanation?
Thanks

xenon · 09-13-2016, 02:12 AM

Your reasoning is sound. Give it beans and both will open.

Jon D · 09-13-2016, 05:07 AM

Thanks for confirming; now that I know what to anticipate, the only problem will be restraining my right foot before the car's run-in!

xenon · 09-13-2016, 08:58 AM

Treat 'em mean, keep 'em keen!

Jon D · 09-13-2016, 01:06 PM

Quote:

Originally Posted by xenon

Treat 'em mean, keep 'em keen!

I know, I know and seeing as I'll probably be changing it in 3 years time, I shouldn't be bothered about breaking it in as carefully as I am.
Trouble is that it's hard to forget 43 years in aviation engineering and I just can't be cruel to metal!

The Beast · 09-14-2016, 01:31 AM

Our new F48 is the same, the one exhaust will only operate once the car has warmed up and above certain revs. I think it's an emissions based set up

09-12-2016, 11:30 AM	#1
Jon D Brigadier General 224 Rep 3,016 Posts Drives: 2022 840d Join Date: Sep 2009 Location: Scotland iTrader: (0)	535i exhaust Got my new 640i (same engine as the 535) last week and have just noticed that the RH tailpipe is completely clean, whereas the LH shows signs of moderate usage. Also noticed that immediately after a run of 30 miles the the RH tailpipe is completely cold. Still running-in and haven't exceeded 3k RPM so I'm guessing that it's a split system and that the other half only cuts in above a certain RPM. Looking underneath I notice a distinct difference in the mufflers - the LH is a large rectangular box and the RH is a tubular in-line unit. Can anyone confirm my reasoning or offer a different explanation? Thanks
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09-13-2016, 02:12 AM	#2
xenon Major General 1397 Rep 8,083 Posts Drives: 2021 G21 330i M-Sport Join Date: Jun 2008 Location: Coventry iTrader: (0)	Your reasoning is sound. Give it beans and both will open. __________________ Ian Current: 2021 G21 330i M-Sport Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2
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09-13-2016, 05:07 AM	#3
Jon D Brigadier General 224 Rep 3,016 Posts Drives: 2022 840d Join Date: Sep 2009 Location: Scotland iTrader: (0)	Thanks for confirming; now that I know what to anticipate, the only problem will be restraining my right foot before the car's run-in!
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09-13-2016, 08:58 AM	#4
xenon Major General 1397 Rep 8,083 Posts Drives: 2021 G21 330i M-Sport Join Date: Jun 2008 Location: Coventry iTrader: (0)	Treat 'em mean, keep 'em keen! __________________ Ian Current: 2021 G21 330i M-Sport Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2
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09-14-2016, 01:31 AM	#6
The Beast Lieutenant Colonel 268 Rep 1,597 Posts Drives: VW Transporter Sportline Join Date: Aug 2010 Location: Wolverhampton iTrader: (0)	Our new F48 is the same, the one exhaust will only operate once the car has warmed up and above certain revs. I think it's an emissions based set up __________________ Current: VW Transporter Sportline, F48 X1 20i M Sport. Previous: F10 530d M Sport, W176 A200 CDI AMG Evolution, E70 X5 3.0 SD M Sport, F20 120d M Sport, E81 120d M Sport, E46 325i M Sport, E46 318ci & Many Others...
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