No overrun popping on JCW exhaust

[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?

[MiniService]

Have you ever thought maybe you shouldnt be overreving the engine

[ScienceGuy]

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]

on a JCW....are you kidding?

[Paul]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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