[Hot Tub Alci]

Hi everyone, was wondering if anyone out there had any answers to my silly question.

I have a Copper S Works on a 53 plate, and had it upgrade to the the new 210BHP Works kit last Sept / October in hope that the new system would back fire like all the new 04 Mini's do. It didnt.

Any ideas how I can do this? Do I need to replace the Exhust or simply upgrade the software chip?

A Friend of mine borrowed a 04 / 54 plate Mini CS and that back fired all the time, however when he picked up his new 04/54 plate, the back firing had eased off - is this BMW taking away the fun of it?

Any advice would be greatly appricated.

HTA

[PmP]

My 04 didnt do it half as much when it was new, does it alot more since first service.

[Aqualung]

I have a Jan '04 build MCS/JCW and the only farting is inside the cockpit..have never heard it outside.

[Hot Tub Alci]

I'd put money on it that the software has been changed - Now can anyone come up with a fix !!!

[cooper_s_flyer]

Quote: Originally Posted by Hot Tub Alci

Hi everyone, was wondering if anyone out there had any answers to my silly question.

I have a Copper S Works on a 53 plate, and had it upgrade to the the new 210BHP Works kit last Sept / October in hope that the new system would back fire like all the new 04 Mini's do. It didnt.

Any ideas how I can do this? Do I need to replace the Exhust or simply upgrade the software chip?

A Friend of mine borrowed a 04 / 54 plate Mini CS and that back fired all the time, however when he picked up his new 04/54 plate, the back firing had eased off - is this BMW taking away the fun of it?

Any advice would be greatly appricated.
HTA

1) Why...?

2) Did you know that a true "backfire" is detrimental to your Mini...?

3) My car has **never** been "flatulant"...nor would I wish for it to be. That sound is not "sweet", it is somewhat obnoxious IMHO, and serves no real purpose.

Also IMHO, the ample sound of the JCW supercharger (especially above 4500rpm), and abject lack of exhaust resonance and deep mellow tone of the JCW exhaust should be plenty to be excited about.

I would rather run "stealth" any day than have the sound of "gunfire" errupt behind my Mini each time I downshift at high rpm...

But, "to each his own"... I wish you luck trying to get your car to "pass gas explosively"...

2 cents... deposited.

Cheers

[Jones]

Get a Milltek manifold and Hi-flow Cat and you will be popping and gurgling all you want!! I usually hear mine when down shifting....

[Hot Tub Alci]

Quote: Originally Posted by cooper_s_flyer

1) Why...?

2) Did you know that a true "backfire" is detrimental to your Mini...?

3) My car has **never** been "flatulant"...nor would I wish for it to be. That sound is not "sweet", it is somewhat obnoxious IMHO, and serves no real purpose.

Also IMHO, the ample sound of the JCW supercharger (especially above 4500rpm), and abject lack of exhaust resonance and deep mellow tone of the JCW exhaust should be plenty to be excited about.

I would rather run "stealth" any day than have the sound of "gunfire" errupt behind my Mini each time I downshift at high rpm...

But, "to each his own"... I wish you luck trying to get your car to "pass gas explosively"...

2 cents... deposited.

Cheers

One, I would not want any flatulant to do any damage to my car!
Two, The grin on my face every time I hear a beautiful Mini going past and changing down the gears is a fantastic sound.
Three, The sound of the JCW over 4500 RPM is indeed fantastic, however when I'm down shifting round town, the sound would indeed be enhanced !! LOL
Four, Please can you expand your reasons for damaging the car. If a brand new car is rolling out ofthe Cowley plant is farting and you say its damaging surely something isnt right?

[Hot Tub Alci]

Quote: Originally Posted by Jones

Get a Milltek manifold and Hi-flow Cat and you will be popping and gurgling all you want!! I usually hear mine when down shifting....

Hey Jones, Can you fit these to the works and if so, where did you get any work done?

[cooper_s_flyer]

Quote: Originally Posted by Hot Tub Alci

One, I would not want any flatulant to do any damage to my car!
Two, The grin on my face every time I hear a beautiful Mini going past and changing down the gears is a fantastic sound.
Three, The sound of the JCW over 4500 RPM is indeed fantastic, however when I'm down shifting round town, the sound would indeed be enhanced !! LOL
Four, Please can you expand your reasons for damaging the car. If a brand new car is rolling out ofthe Cowley plant is farting and you say its damaging surely something isnt right?

...I see that you are after the "burbling" noise or rumble that is had with the '05 MCSs... I do not believe that this will harm your MCS. I think the best way to regain this noise in light of remapping of the ECU would be to decrease backpressure just enough to cause the noise to occur. Headers (Milltek as suggested in this thread) and perhaps a high flow cat. The uprated coil pack and wires might aid you in this effort as well.

The rumble you seek is due to lower back pressure in the exhaust system and the ECU mapping for that model sequence and is not considered a "backfire"...

A backfire is considered to be a "post-ignition" of unburned fuel... an explosion of sorts.

A true backfire can also sometimes be heard in an engine that has the cat removed and has been fitted with a very free flowing exhaust. It can also be had when the timing has been "jimmied" or is slightly out of phase. And it can be had with manefestations of the former combined with higher octane fuels. In any case, the true backfire is not good for the exhaust system, ignition, or the engine itself. It has the capacity of doing harm.

[wibbly]

Try PM'ing Loui on here (or www.miniaddiction.co.uk) - he has dropped a Milltek header and cat on (as I have) but has then replaced the front silencer and his now sounds like a machine gun....!

Sure he can talk you through the in's and outs of what he has done to it.....

As it happens his was louder than mine with just the millteks on (we changed them at the same time)... his being a 54 plate, mine being an 03 Works....

[Loui]

Quote: Originally Posted by wibbly

Try PM'ing Loui on here (or www.miniaddiction.co.uk) - he has dropped a Milltek header and cat on (as I have) but has then replaced the front silencer and his now sounds like a machine gun....!

Sure he can talk you through the in's and outs of what he has done to it.....

As it happens his was louder than mine with just the millteks on (we changed them at the same time)... his being a 54 plate, mine being an 03 Works....

Basically as Wibs said above, took it to powerflow in stafford an the guy took the front box out of the JCW exhaust system, it pops an bangs like mad, not sure if i like it yet i think the mgnaflow ive got sat in the garage is going on to be honnest LOL

[Hot Tub Alci]

Anyone got the number or web site for Powerflow in Stafford?

[Loui]

I havent mate its stafford tyres so try that on yell.com mate

[KiwiJCW]

I had the resonator cut out of my JCW exhaust, and it made all the difference. I was disappointed with the exhaust sound when I had the Works kit fitted but my car now pops & burbles on the overrun, sounds great. I think it was one of those nice Aussies (Baker?) who recommended it to me when I posted a similar query earlier this year.

Easy to do, just take the car to a specialist, and have them replace the resonator with a stainless sleeve. Keep the resonator in case you want to go back. Cost me about 30 quid.

[R1]

My '06 JCW pops back so it can't be the software.

[stephen orford]

Our May 06 JCW burbles gurgles and pops on the over run all the time its magic. So it cannot be a mod to the ECU map. I was told that its the map that provides these sounds!

[Paul]

EVERY Cooper S burbles and pops. The first time I drove a Cooper S it was on of the first things myself and the other journo in the car with me noticed. Get it right and pop and bang quite nicely. With the July '04 update (facelift) it all changed and it burbles and rattles away more than before.

The JCW kit in both cases amplifies it nicely, I remember (again looking back) when Ginger and I drove the Works S (pre facelift) and were so impressed when snapping each other the way it banged and burbled.

Just try harder.

[No16]

Any popping and banging on overun is a backfire, what happens is when you lift off the gas pedal the mixture in the engine goes very lean. Lots of air little petrol(should be none in a decently mapped injected engine) this results in the mixture not igniting and it is expelled into the manifold. Form here the mixture can be ignited further down the exhaust due to hot gasses etc. most likely from a subsequent succefull ignition, occasionally backfireing occurrs through leaks in the exhaust system as it does require oxygen to burn.

If you want to 'hear' this more best way is to remove the cat and with a low pressure exhaust beyond you'll have plenty snap crackle and pop. Be warned though all this igniting fuel will slowly burn away the packing of your silencer. i had an elise with some very 'lumpy' cams no cat and supersports exhaust sounded great when i bolted it together, sounded like a holey bean can after 6 months or so......went from sounding good to sounding like the exhaust was fubard.

my factory 55 works does pop on overun but you have to be listening for it to notice so some form of aftermarket exhaust or removing the first box 'resonator' as mentioned above will be necasary if you want it to be a 'feature'.

i can only presume the fact that it does it is a 'feature' of the JCW map. Although probably exagerated by being a forced induction engine and the lower compression pistons these type of engines normally have resulting in even less efficient 'lean' burn.

[KiwiJCW]

Quote: Originally Posted by Paul Mullett (original)

EVERY Cooper S burbles and pops. The first time I drove a Cooper S it was on of the first things myself and the other journo in the car with me noticed. Get it right and pop and bang quite nicely. With the July '04 update (facelift) it all changed and it burbles and rattles away more than before.

The JCW kit in both cases amplifies it nicely, I remember (again looking back) when Ginger and I drove the Works S (pre facelift) and were so impressed when snapping each other the way it banged and burbled.

Just try harder.

I'm not sure this is true. I've had two MCS,....one did the other didn't even when redlining & changing up. My JCW upgrade didn't increase the popping either until I took the resonator out.

[KiwiJCW]

The thread here has quite a bit of discussion:

MotoringFile » Archive » Exhaust Popping

Also includes this:
"Service Measure M 18 200 04 9/27/04

Subject: Model Year 2005 MINI Cooper S Popping From Exhaust

Complaint: The vehicle exhibits an acoustic feedback of the exhaust system under the following conditions: Engine braking in 1st, 2nd, or 3rd gear. Increasing engine speed above 3000 rpm while the vehicle is stationary

The popping noise from the exhaust system can also be described as a “backfire” from the engine.

Measure: Do not attempt to repair or replace any parts, this is not a failure of any driveline components. The acoustic feedback is a standard feature of the 2005 Model Year Cooper S vehicle produced as of 7/2004. This feature cannot be retrofitted to the previous model year vehicles."