E89 road prescence

[stuartinzg]

You don't lose any of the pops..or back pressure.. The flap is right at the tailpipe.

The loud bang is usually when it's in overboost, or that's when mine seems to do it most... Although I have short shifted a couple of times and the shotgun blast has suprised me..

Yes, the car does pop and crackle more in sport...
The throttle mapping is different in sport mode, can only assume that causes it.

Ok, I thought it was perhaps clever trickery with the valve which caused the pops... I'll have a play over the weekend. How can I safely "cap" the pipes?

[Z4M-2006]

Just one pipe..

Golf tee, small bolt or bung ?

2 second job..

[stuartinzg]

Just one pipe..

Golf tee, small bolt or bung ?

2 second job..

But what about stopping crap go into the actuator valve once you pull the pipe off?

[Z4M-2006]

Ah...

I put some butyl on that

[jamesbond]

yes yes ... all very funny

[Z4M-2006]

??

What's amused you JB?

[john-e89]

??

What's amused you JB?

Think it'll be the banter with Mr Wilkes on the previous page.

[jamesbond]

??

What's amused you JB?

Think it'll be the banter with Mr Wilkes on the previous page.

yes brought a smile to my face .. had not realised how far the thread had moved on

[jamesbond]

That's interesting...

Will have to have a look to see if I can spot a name...

I take it the 35i has the exhaust flap in the offside tailpipe?

yes that is correct ... I have a photo some where of the exhaust with some description stampings, let be have a look

[stuartinzg]

Ah...

I put some butyl on that

Got under the car yesterday, used an old valve cap to cover the pipe and some elctrical tape to stop stuff getting into the actuator. Will look for a better solution (saw on eBay there are proper caps for sale for a couple of quid). Ideally you need one cap which fits on both ends but blocked in the middle so the pipe isn't flapping around and it looks OEM from BMW's POV.

What a difference! I was highly sceptical at first, but it sounds like it should now. No more rattling and noises from the valve - just proper sound Quite often on a hill at part throttle you could hear that it wasn't open or shut properly and it would just vibrate or rattle...crap.

Even more antisocial now - doesn't need an aftermarket exhaust anymore

[Z4M-2006]

Result....

[jimbo1958]

Ah...

I put some butyl on that

Got under the car yesterday, used an old valve cap to cover the pipe and some elctrical tape to stop stuff getting into the actuator. Will look for a better solution (saw on eBay there are proper caps for sale for a couple of quid). Ideally you need one cap which fits on both ends but blocked in the middle so the pipe isn't flapping around and it looks OEM from BMW's POV.

What a difference! I was highly sceptical at first, but it sounds like it should now. No more rattling and noises from the valve - just proper sound Quite often on a hill at part throttle you could hear that it wasn't open or shut properly and it would just vibrate or rattle...crap.

Even more antisocial now - doesn't need an aftermarket exhaust anymore

Nice......will have to look into this.

[john-e89]

Yep def going to try this mod.

[pvr]

Is that for the 35i as well?

[stuartinzg]

If you look and see a valve under the right exhaust then yes