Cold start stock exhaust valves open

Wills2 · 05-22-2016, 07:20 AM

For anyone that's interested this a short clip of how the stock exhaust sounds with the valves open.

I'd recommend listening with ear phones as the sound reproduction is pretty pants on a phone /tablet, apologies for the chicken legs.

JovanUK · 05-22-2016, 09:07 AM

Sounds good! Nice plate btw.

JustChris · 05-22-2016, 10:11 AM

Lovely sound.

derekh929 · 05-22-2016, 02:31 PM

lovely sound indeed , cracking plate as well

Wills2 · 05-24-2016, 09:41 AM

I think Guy (gtsussex) should pop a video up on this thread doing the same (valves open, slight blip of the throttle) so we can hear the differences.

Ade_7 · 05-24-2016, 10:29 AM

I don't think there would be any difference? They are both stock exhausts on the CP cars? The burble on overrun was only that strong on CP cars was it not?

Can OP confirm if his car is CP or not?

If not then I will be very happy as that's about the main thing I really think I'll miss from the CP

M5essex · 05-24-2016, 10:46 AM

Quote:

Originally Posted by Ade_7

I don't think there would be any difference? They are both stock exhausts on the CP cars? The burble on overrun was only that strong on CP cars was it not?

Can OP confirm if his car is CP or not?

If not then I will be very happy as that's about the main thing I really think I'll miss from the CP

Wills car is not a CP car.

Ade_7 · 05-24-2016, 10:53 AM

Really? Well I'm getting crazy excited then!! That crackling burble on overrun with minor revs sounds much more like the CP car than I though the stock car would!!

I might have to take my CG valve controller with me to the dealers for collection and crawl around fitting during handover

gtsussex · 05-24-2016, 10:54 AM

Right so what do you want? Cold start should be pretty similar with valves open or closed. Where difference should be is warm starts.

Will happily do whatever is needed

Ade_7 · 05-24-2016, 10:58 AM

Quote:

Originally Posted by gtsussex

Right so what do you want? Cold start should be pretty similar with valves open or closed. Where difference should be is warm starts.

Will happily do whatever is needed

I'll be honest i'd be interested to see a comparison of cold start with the same sort of small throttle blips to compare the overrun stock to CP.

Wills2 · 05-24-2016, 10:59 AM

Quote:

Originally Posted by Ade_7

I don't think there would be any difference? They are both stock exhausts on the CP cars? The burble on overrun was only that strong on CP cars was it not?

Can OP confirm if his car is CP or not?

If not then I will be very happy as that's about the main thing I really think I'll miss from the CP

Stock exhausts Ade, not a CP car.

But I've opened the valves for the cold start (much louder)

Wills2 · 05-24-2016, 10:59 AM

Quote:

Originally Posted by Ade_7

I'll be honest i'd be interested to see a comparison of cold start with the same sort of small throttle blips to compare the overrun stock to CP.

That's the ticket.

Wills2 · 05-24-2016, 11:02 AM

Quote:

Originally Posted by gtsussex

Right so what do you want? Cold start should be pretty similar with valves open or closed. Where difference should be is warm starts.

Will happily do whatever is needed

Cold start much louder with them open

Yes it would be great to have a video of your CP cold start valves open and a few gentle 2k blips just to compare.

gtsussex · 05-24-2016, 11:13 AM

Quote:

Originally Posted by Wills2

Cold start much louder with them open

Yes it would be great to have a video of your CP cold start valves open and a few gentle 2k blips just to compare.

Will try it in a bit. Car hasn't moved for 11 hours so hopefully should be on cold start mode now.

Ade_7 · 05-24-2016, 12:28 PM

Quote:

Originally Posted by Wills2

Stock exhausts Ade, not a CP car.

But I've opened the valves for the cold start (much louder)

Excellent! How old is the car? Does it have the latest software etc?

I knew the valves open made quite a big difference to the sound but I don't recall hearing a stock non CP car have that sort of burbly overrun?

If it's just minor tweeks on newer cars/firmware then I'm even more excited about Sunday!

Wills2 · 05-24-2016, 12:50 PM

Quote:

Originally Posted by Ade_7

Excellent! How old is the car? Does it have the latest software etc?

I knew the valves open made quite a big difference to the sound but I don't recall hearing a stock non CP car have that sort of burbly overrun?

If it's just minor tweeks on newer cars/firmware then I'm even more excited about Sunday!

It was built Feb 2016 so doesn't have the April 58.3 software update, I was quite surprised at the crackles, is yours a CP? If so you'll enjoy lots of pops and crackles that the stock exhaust on mine doesn't have.

Ade_7 · 05-24-2016, 01:07 PM

Quote:

Originally Posted by Wills2

It was built Feb 2016 so doesn't have the April 58.3 software update, I was quite surprised at the crackles, is yours a CP? If so you'll enjoy lots of pops and crackles that the stock exhaust on mine doesn't have.

No mine isn't a CP that's why I'm more excited after hearing that!!

gtsussex · 05-24-2016, 04:05 PM

Right, here you go. Camera mic wasn't happy about volume on noise....

gtsussex · 05-24-2016, 04:07 PM

I don't think there's any diff....

dzvero · 05-24-2016, 04:28 PM

Sound is nice

Just wondering if the engine is limited to 3000 rpm when cold, thats what I get when flooring without driving.

Wills2 · 05-24-2016, 05:23 PM

Quote:

Originally Posted by gtsussex

I don't think there's any diff....

There is you've got a lovely carbon diffusor.

No there is, yours sounds deeper and better.

dopper99 · 05-24-2016, 05:25 PM

Quote:

Originally Posted by gtsussex

Right, here you go. Camera mic wasn't happy about volume on noise....

Was that with the valves open on start up Guy?

Doesnt seem to last long and goes quieter within 30 secs. Just as well come winter time when you leave the engine running while defrosting the windscreen.

05-22-2016, 07:20 AM	#1
Wills2 Barge driver 8656 Rep 12,425 Posts Drives: 730d Join Date: Aug 2014 Location: UK iTrader: (0)	Cold start stock exhaust valves open For anyone that's interested this a short clip of how the stock exhaust sounds with the valves open. I'd recommend listening with ear phones as the sound reproduction is pretty pants on a phone /tablet, apologies for the chicken legs. __________________ 730d/Z4C Last edited by Wills2; 05-22-2016 at 07:27 AM..
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05-22-2016, 09:07 AM	#2
JovanUK First Lieutenant 142 Rep 301 Posts Drives: '17 M4 F83 CP, '18 M140i SHA. Join Date: May 2015 Location: Oxfordshire iTrader: (0)	Sounds good! Nice plate btw. __________________ "We at BMW do not build cars as consumer objects, just to drive from A to B. We build mobile works of art" - Chris Bangle "If it depreciates, lease it. If it appreciates, buy it."
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05-22-2016, 10:11 AM	#3
JustChris General 17488 Rep 25,115 Posts Drives: Tesla MYRWD Join Date: Jul 2013 Location: UK iTrader: (0)	Lovely sound. __________________ My car made front page of Bimmerpost
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05-22-2016, 02:31 PM	#4
derekh929 Major 292 Rep 1,121 Posts Drives: AMG C63s Coupe & F56 JCW Join Date: Apr 2012 Location: Scotland iTrader: (0)	lovely sound indeed , cracking plate as well
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05-24-2016, 09:41 AM	#5
Wills2 Barge driver 8656 Rep 12,425 Posts Drives: 730d Join Date: Aug 2014 Location: UK iTrader: (0)	I think Guy (gtsussex) should pop a video up on this thread doing the same (valves open, slight blip of the throttle) so we can hear the differences. __________________ 730d/Z4C
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05-24-2016, 10:29 AM	#6
Ade_7 Lieutenant 314 Rep 513 Posts Drives: F80 M3 Join Date: Apr 2014 Location: UK iTrader: (0)	I don't think there would be any difference? They are both stock exhausts on the CP cars? The burble on overrun was only that strong on CP cars was it not? Can OP confirm if his car is CP or not? If not then I will be very happy as that's about the main thing I really think I'll miss from the CP
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05-24-2016, 10:53 AM	#8
Ade_7 Lieutenant 314 Rep 513 Posts Drives: F80 M3 Join Date: Apr 2014 Location: UK iTrader: (0)	Really? Well I'm getting crazy excited then!! That crackling burble on overrun with minor revs sounds much more like the CP car than I though the stock car would!! I might have to take my CG valve controller with me to the dealers for collection and crawl around fitting during handover
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05-24-2016, 10:54 AM	#9
gtsussex Brigadier General 1854 Rep 3,983 Posts Drives: SMB M3 CP with lots of carbon Join Date: Jun 2013 Location: East Sussex iTrader: (0)	Right so what do you want? Cold start should be pretty similar with valves open or closed. Where difference should be is warm starts. Will happily do whatever is needed __________________ San Marino Blue M3 Competition Package with Carbon tat, ACS RS suspension, uprated brakes, 'modded' exhaust and a weeny bit more power courtesy of JF Automotive; M235i Convertible with ACS Sports Suspension; Disco 5 HSE Lux
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05-24-2016, 04:05 PM	#18
gtsussex Brigadier General 1854 Rep 3,983 Posts Drives: SMB M3 CP with lots of carbon Join Date: Jun 2013 Location: East Sussex iTrader: (0)	Right, here you go. Camera mic wasn't happy about volume on noise.... __________________ San Marino Blue M3 Competition Package with Carbon tat, ACS RS suspension, uprated brakes, 'modded' exhaust and a weeny bit more power courtesy of JF Automotive; M235i Convertible with ACS Sports Suspension; Disco 5 HSE Lux Last edited by gtsussex; 05-24-2016 at 04:49 PM..
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05-24-2016, 04:07 PM	#19
gtsussex Brigadier General 1854 Rep 3,983 Posts Drives: SMB M3 CP with lots of carbon Join Date: Jun 2013 Location: East Sussex iTrader: (0)	I don't think there's any diff.... __________________ San Marino Blue M3 Competition Package with Carbon tat, ACS RS suspension, uprated brakes, 'modded' exhaust and a weeny bit more power courtesy of JF Automotive; M235i Convertible with ACS Sports Suspension; Disco 5 HSE Lux
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05-24-2016, 04:28 PM	#20
dzvero Lieutenant Colonel 529 Rep 1,514 Posts Drives: 2015 M$4 F82 Join Date: Dec 2015 Location: CA iTrader: (2)	Sound is nice Just wondering if the engine is limited to 3000 rpm when cold, thats what I get when flooring without driving.
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