MINI2

KiwiJCW · Jan 25th, 2006, 01:55 AM

I upgraded my MCS to Works spec last year and love it but am a bit disappointed with the exhaust sound. I never get any popping on the overrun when driving hard, and can't really hear the exhaust when revving hard so I'm conteplating a replacement exhaust.

Before I replace the JCW exhaust with say a UUC, does anyone have any thoughts about why I'm not getting overrun popping?

Second, I notice that John Cooper Mororsports advertise a rear silencer. Has anyone tried this & can report their experiences?

MiniService · Jan 25th, 2006, 02:06 AM

Have you ever thought maybe you shouldnt be overreving the engine

ScienceGuy · Jan 25th, 2006, 02:30 AM

Quote: Originally Posted by KiwiJCW

Before I replace the JCW exhaust with say a UUC, does anyone have any thoughts about why I'm not getting overrun popping?

I'm not sure, but I suspect it is because MINI did a good job of writing
the software for the engine-management computer, and it doesn't dump
a pile of unburnable fuel into the combustion chambers when you decellerate.

Refs: AEM website

KiwiJCW · Jan 25th, 2006, 07:10 AM

on a JCW....are you kidding?

Paul · Jan 25th, 2006, 09:17 AM

That's odd, the JCW Kit usually makes it more pronounced and amplified, from my experience of driving a few different Works anyway.

Cooper_si · Jan 25th, 2006, 09:32 AM

Quote: Originally Posted by KiwiJCW

...and can't really hear the exhaust when revving hard....

If you open your tailgate....inside,look down at the back panel where there are two vents (one either side of the panel). In these vents are small peices of foam....remove the foam so the vents are completley empty....NOW you will here your exhaust better, even more so if you remove the parcel shelf aswell

Top tip for today

St00ge · Jan 25th, 2006, 09:49 AM

Quote: Originally Posted by MiniService

Have you ever thought maybe you shouldnt be overreving the engine

wtf? are you kidding? You buy a JCW, if not a MCS, to rev the bloody thing.

camini · Jan 25th, 2006, 05:57 PM

I think/hope MiniService was joking.

Are you serious about removing the foam? I was thinking about removing the foam just to make 'closing the door' easier - i.e. hoping the car becomes a little less air-tight..

Rayman · Jan 25th, 2006, 06:01 PM

Quote: Originally Posted by KiwiJCW

I upgraded my MCS to Works spec last year and love it but am a bit disappointed with the exhaust sound. I never get any popping on the overrun when driving hard, and can't really hear the exhaust when revving hard so I'm conteplating a replacement exhaust.

Before I replace the JCW exhaust with say a UUC, does anyone have any thoughts about why I'm not getting overrun popping?

Second, I notice that John Cooper Mororsports advertise a rear silencer. Has anyone tried this & can report their experiences?

Nah doubt he was joking, did you get any popping with the standard MCS spec exhaust at all.?

KiwiJCW · Jan 25th, 2006, 08:29 PM

Quote: Originally Posted by Rayman

Nah doubt he was joking, did you get any popping with the standard MCS spec exhaust at all.?

Nope...never got popping with my MCS before the JCW upgrade either despite energetically backing off the throttle at high revs in 1st, 2nd and 3rd gears. I'm not sure that taking the foam out will make much difference (though I'll try it) as I can't hear overrun popping when in tunnels with the window down & sunroof open. I spoke to my local BMW service manager yesterday who said that surpisingly some customers (not many) have complained about the exhaust popping. He didn't have a ready answer for my query but said he'd research the topic & get back to me, and if necessary they'd check the car over. He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models.

ScienceGuy · Jan 25th, 2006, 09:07 PM

Quote: Originally Posted by KiwiJCW

He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models.

I think changing the design or the tuning of an automobile so that it uses more
fuel and makes more noise without any performance gain is a bad idea.

Rayman · Jan 25th, 2006, 09:10 PM

Quote: Originally Posted by KiwiJCW

Nope...never got popping with my MCS before the JCW upgrade either despite energetically backing off the throttle at high revs in 1st, 2nd and 3rd gears. I'm not sure that taking the foam out will make much difference (though I'll try it) as I can't hear overrun popping when in tunnels with the window down & sunroof open. I spoke to my local BMW service manager yesterday who said that surpisingly some customers (not many) have complained about the exhaust popping. He didn't have a ready answer for my query but said he'd research the topic & get back to me, and if necessary they'd check the car over. He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models.

Yep your right some mini owners dont like the pop on overun at all. I personally love it and your pretty unlucky not to have got one that does it. It seems like its your car and nothing to do with the JCW conversion.
Maybe it will take a while for the engine to get some miles on before it starts to create the pop thru the exhaust. Surely the pop on overun will increase as you run the miles in on your car?

RedUn · Jan 25th, 2006, 10:42 PM

Quote: Originally Posted by camini

I think/hope MiniService was joking.

Are you serious about removing the foam? I was thinking about removing the foam just to make 'closing the door' easier - i.e. hoping the car becomes a little less air-tight..

the foam idea sounds great to me if it means more noise

RedUn · Jan 25th, 2006, 10:43 PM

Quote: Originally Posted by KiwiJCW

Nope...never got popping with my MCS before the JCW upgrade either despite energetically backing off the throttle at high revs in 1st, 2nd and 3rd gears. I'm not sure that taking the foam out will make much difference (though I'll try it) as I can't hear overrun popping when in tunnels with the window down & sunroof open. I spoke to my local BMW service manager yesterday who said that surpisingly some customers (not many) have complained about the exhaust popping. He didn't have a ready answer for my query but said he'd research the topic & get back to me, and if necessary they'd check the car over. He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models.

I think where your going wrong is the high revs bit, try lifting off in 1st or 2nd gear at around 2-3k rpm and your sure to hear it then!

also use the highest octance pump fuel you can, that seems to aid the popping a bit more

RedUn · Jan 25th, 2006, 10:44 PM

Quote: Originally Posted by ScienceGuy

I think changing the design or the tuning of an automobile so that it uses more
fuel and makes more noise without any performance gain is a bad idea.

good job your not designing minis then isn't it

JCWMinster · Jan 25th, 2006, 11:17 PM

Hey Kiwi!

I have a Cooper S Works too (factory released) and I can tell you that mine doesn't have a great deal of 'pop' in over run... It is there, but not overly loud at all. At low RPM and slow driving around car parks etc, it is very noticable...

I have heard a few other Mini's with after market exhausts... The one you have on there is pretty sweet overall!

I might try out the foam idea, although I had taped and insulated those flaps from the inside, no good playing Ministry of Sound on the Harmon Kardon!

I'm a kiwi too, but living in Oz!

coops41 · Jan 26th, 2006, 12:00 AM

KiwiJCW,

Australian spec JCW cars have an extra resonator in the straight pipe after the cat converter. UK cars do not have this. I have heard an Aussie JCW with this res removed and it definitely increased the exhaust volume and popping. Saying that Ive got a JCW and replaced the exhaust with a Hi tech cat back small muffler system, sounds like champagne corks going off on the over run.

Scott

St00ge · Jan 26th, 2006, 12:19 AM

Quote: Originally Posted by RedUn

I think where your going wrong is the high revs bit, try lifting off in 1st or 2nd gear at around 2-3k rpm and your sure to hear it then!

also use the highest octance pump fuel you can, that seems to aid the popping a bit more

what he said

2-3krpm, leave it in first, do it in a supermarket carpark

bimini · Jan 26th, 2006, 12:44 AM

or 2nd and annoy the neighbours as you let of the gas every time you slow down for you drive...

St00ge · Jan 26th, 2006, 12:46 AM

Quote: Originally Posted by bimini

or 2nd and annoy the neighbours as you let of the gas every time you slow down for you drive...

yes, have done

Jan 25th, 2006, 01:55 AM	#1
KiwiJCW MINI2 Regular Join Date: Jan 2006 Location: New Zealand Local Time: 10:28 AM Posts: 57 Offline	No overrun popping on JCW exhaust I upgraded my MCS to Works spec last year and love it but am a bit disappointed with the exhaust sound. I never get any popping on the overrun when driving hard, and can't really hear the exhaust when revving hard so I'm conteplating a replacement exhaust. Before I replace the JCW exhaust with say a UUC, does anyone have any thoughts about why I'm not getting overrun popping? Second, I notice that John Cooper Mororsports advertise a rear silencer. Has anyone tried this & can report their experiences?

Jan 25th, 2006, 09:32 AM	#6 (permalink)
Cooper_si the DASH LIGHT king ? ;) Join Date: Sep 2004 Location: Nr Melton Mowbray Local Time: 09:28 PM Posts: 488 Offline	Quote: Originally Posted by KiwiJCW ...and can't really hear the exhaust when revving hard.... If you open your tailgate....inside,look down at the back panel where there are two vents (one either side of the panel). In these vents are small peices of foam....remove the foam so the vents are completley empty....NOW you will here your exhaust better, even more so if you remove the parcel shelf aswell Top tip for today THE Legend who helps ALL MINI owners

Jan 25th, 2006, 06:01 PM	#9 (permalink)
Rayman "Buying and selling" Join Date: Dec 2003 Location: Warrington Local Time: 10:28 PM Posts: 786 Offline	Quote: Originally Posted by KiwiJCW I upgraded my MCS to Works spec last year and love it but am a bit disappointed with the exhaust sound. I never get any popping on the overrun when driving hard, and can't really hear the exhaust when revving hard so I'm conteplating a replacement exhaust. Before I replace the JCW exhaust with say a UUC, does anyone have any thoughts about why I'm not getting overrun popping? Second, I notice that John Cooper Mororsports advertise a rear silencer. Has anyone tried this & can report their experiences? Nah doubt he was joking, did you get any popping with the standard MCS spec exhaust at all.? 2001 cooper (sold) 1995 Supra RZ-S TT auto in white.

Jan 25th, 2006, 09:10 PM	#12 (permalink)
Rayman "Buying and selling" Join Date: Dec 2003 Location: Warrington Local Time: 10:28 PM Posts: 786 Offline	Quote: Originally Posted by KiwiJCW Nope...never got popping with my MCS before the JCW upgrade either despite energetically backing off the throttle at high revs in 1st, 2nd and 3rd gears. I'm not sure that taking the foam out will make much difference (though I'll try it) as I can't hear overrun popping when in tunnels with the window down & sunroof open. I spoke to my local BMW service manager yesterday who said that surpisingly some customers (not many) have complained about the exhaust popping. He didn't have a ready answer for my query but said he'd research the topic & get back to me, and if necessary they'd check the car over. He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models. Yep your right some mini owners dont like the pop on overun at all. I personally love it and your pretty unlucky not to have got one that does it. It seems like its your car and nothing to do with the JCW conversion. Maybe it will take a while for the engine to get some miles on before it starts to create the pop thru the exhaust. Surely the pop on overun will increase as you run the miles in on your car? 2001 cooper (sold) 1995 Supra RZ-S TT auto in white.

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Jan 25th, 2006, 02:06 AM	#2 (permalink)
MiniService MINI2 Regular Join Date: Apr 2005 Local Time: 05:28 PM Posts: 107 Offline	Have you ever thought maybe you shouldnt be overreving the engine

Jan 25th, 2006, 02:30 AM	#3 (permalink)
ScienceGuy Got evidence? Join Date: Jan 2006 Location: Plymouth, MN Local Time: 03:28 PM Posts: 193 Offline	Quote: Originally Posted by KiwiJCW Before I replace the JCW exhaust with say a UUC, does anyone have any thoughts about why I'm not getting overrun popping? I'm not sure, but I suspect it is because MINI did a good job of writing the software for the engine-management computer, and it doesn't dump a pile of unburnable fuel into the combustion chambers when you decellerate. Refs: AEM website

Jan 25th, 2006, 07:10 AM	#4 (permalink)
KiwiJCW MINI2 Regular Join Date: Jan 2006 Location: New Zealand Local Time: 10:28 AM Posts: 57 Offline	on a JCW....are you kidding?

Jan 25th, 2006, 09:17 AM	#5 (permalink)
Paul Trained Monkey My Classifieds Join Date: Jan 2001 Location: Bedfordshire Local Time: 09:28 PM Posts: 40,354 Online	That's odd, the JCW Kit usually makes it more pronounced and amplified, from my experience of driving a few different Works anyway.

Jan 25th, 2006, 09:49 AM	#7 (permalink)
St00ge 8/10 on the Stoogometer Join Date: Aug 2005 Location: Melbourne Local Time: 07:28 AM Posts: 2,835 Offline	Quote: Originally Posted by MiniService Have you ever thought maybe you shouldnt be overreving the engine wtf? are you kidding? You buy a JCW, if not a MCS, to rev the bloody thing.

Jan 25th, 2006, 05:57 PM	#8 (permalink)
camini MINI2 Regular Join Date: Apr 2003 Location: Brussels Local Time: 11:28 PM Posts: 194 Offline	I think/hope MiniService was joking. Are you serious about removing the foam? I was thinking about removing the foam just to make 'closing the door' easier - i.e. hoping the car becomes a little less air-tight..

Jan 25th, 2006, 08:29 PM	#10 (permalink)
KiwiJCW MINI2 Regular Join Date: Jan 2006 Location: New Zealand Local Time: 10:28 AM Posts: 57 Offline	Quote: Originally Posted by Rayman Nah doubt he was joking, did you get any popping with the standard MCS spec exhaust at all.? Nope...never got popping with my MCS before the JCW upgrade either despite energetically backing off the throttle at high revs in 1st, 2nd and 3rd gears. I'm not sure that taking the foam out will make much difference (though I'll try it) as I can't hear overrun popping when in tunnels with the window down & sunroof open. I spoke to my local BMW service manager yesterday who said that surpisingly some customers (not many) have complained about the exhaust popping. He didn't have a ready answer for my query but said he'd research the topic & get back to me, and if necessary they'd check the car over. He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models.

Jan 25th, 2006, 09:07 PM	#11 (permalink)
ScienceGuy Got evidence? Join Date: Jan 2006 Location: Plymouth, MN Local Time: 03:28 PM Posts: 193 Offline	Quote: Originally Posted by KiwiJCW He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models. I think changing the design or the tuning of an automobile so that it uses more fuel and makes more noise without any performance gain is a bad idea.

Jan 25th, 2006, 10:42 PM	#13 (permalink)
RedUn MUGEN POWER Join Date: Mar 2003 Location: s2ki.com Local Time: 10:28 PM Posts: 11,504 Offline	Quote: Originally Posted by camini I think/hope MiniService was joking. Are you serious about removing the foam? I was thinking about removing the foam just to make 'closing the door' easier - i.e. hoping the car becomes a little less air-tight.. the foam idea sounds great to me if it means more noise

Jan 25th, 2006, 10:43 PM	#14 (permalink)
RedUn MUGEN POWER Join Date: Mar 2003 Location: s2ki.com Local Time: 10:28 PM Posts: 11,504 Offline	Quote: Originally Posted by KiwiJCW Nope...never got popping with my MCS before the JCW upgrade either despite energetically backing off the throttle at high revs in 1st, 2nd and 3rd gears. I'm not sure that taking the foam out will make much difference (though I'll try it) as I can't hear overrun popping when in tunnels with the window down & sunroof open. I spoke to my local BMW service manager yesterday who said that surpisingly some customers (not many) have complained about the exhaust popping. He didn't have a ready answer for my query but said he'd research the topic & get back to me, and if necessary they'd check the car over. He also remarked that facelifted MCS models such as my car are designed to pop more than pre-05 models. I think where your going wrong is the high revs bit, try lifting off in 1st or 2nd gear at around 2-3k rpm and your sure to hear it then! also use the highest octance pump fuel you can, that seems to aid the popping a bit more

Jan 25th, 2006, 10:44 PM	#15 (permalink)
RedUn MUGEN POWER Join Date: Mar 2003 Location: s2ki.com Local Time: 10:28 PM Posts: 11,504 Offline	Quote: Originally Posted by ScienceGuy I think changing the design or the tuning of an automobile so that it uses more fuel and makes more noise without any performance gain is a bad idea. good job your not designing minis then isn't it

Jan 25th, 2006, 11:17 PM	#16 (permalink)
JCWMinster MY05 Chilli JCW Join Date: Jan 2006 Location: Brisbane, Australia Local Time: 07:28 AM Posts: 44 Offline	Hey Kiwi! I have a Cooper S Works too (factory released) and I can tell you that mine doesn't have a great deal of 'pop' in over run... It is there, but not overly loud at all. At low RPM and slow driving around car parks etc, it is very noticable... I have heard a few other Mini's with after market exhausts... The one you have on there is pretty sweet overall! I might try out the foam idea, although I had taped and insulated those flaps from the inside, no good playing Ministry of Sound on the Harmon Kardon! I'm a kiwi too, but living in Oz!

Jan 26th, 2006, 12:00 AM	#17 (permalink)
coops41 MINI2 Regular Join Date: Aug 2002 Location: melbourne Local Time: 07:28 AM Posts: 112 Offline	KiwiJCW, Australian spec JCW cars have an extra resonator in the straight pipe after the cat converter. UK cars do not have this. I have heard an Aussie JCW with this res removed and it definitely increased the exhaust volume and popping. Saying that Ive got a JCW and replaced the exhaust with a Hi tech cat back small muffler system, sounds like champagne corks going off on the over run. Scott

Jan 26th, 2006, 12:19 AM	#18 (permalink)
St00ge 8/10 on the Stoogometer Join Date: Aug 2005 Location: Melbourne Local Time: 07:28 AM Posts: 2,835 Offline	Quote: Originally Posted by RedUn I think where your going wrong is the high revs bit, try lifting off in 1st or 2nd gear at around 2-3k rpm and your sure to hear it then! also use the highest octance pump fuel you can, that seems to aid the popping a bit more what he said 2-3krpm, leave it in first, do it in a supermarket carpark

Jan 26th, 2006, 12:44 AM	#19 (permalink)
bimini MINI2 Master Join Date: Jul 2005 Location: Poole Local Time: 10:28 PM Posts: 769 Offline	or 2nd and annoy the neighbours as you let of the gas every time you slow down for you drive...

Jan 26th, 2006, 12:46 AM	#20 (permalink)
St00ge 8/10 on the Stoogometer Join Date: Aug 2005 Location: Melbourne Local Time: 07:28 AM Posts: 2,835 Offline	Quote: Originally Posted by bimini or 2nd and annoy the neighbours as you let of the gas every time you slow down for you drive... yes, have done

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