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Exhaust modification

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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Smartbear
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Exhaust modification

Post by Smartbear » Mon Sep 25, 2017 10:18 am

Ducklakeview wrote: Thu Sep 21, 2017 11:25 am
dvd112 wrote: Thu Sep 21, 2017 10:26 am Mike do you have any videos
There are lots spread through the thread. I'll try and repost them all in one place later.

Mike
Any exhaust mods to the 2.0 turbo mike?
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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Machine monkey
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Exhaust modification

Post by Machine monkey » Mon Sep 25, 2017 11:05 am

Smartbear wrote: Mon Sep 25, 2017 10:18 am
Ducklakeview wrote: Thu Sep 21, 2017 11:25 am
dvd112 wrote: Thu Sep 21, 2017 10:26 am Mike do you have any videos
There are lots spread through the thread. I'll try and repost them all in one place later.

Mike
Any exhaust mods to the 2.0 turbo mike?
Rob
The best mod for your exhaust Rob would be a bigger down pipe from the turbo. And then bigger bore and better flowing silencers. With that and a tune i bet you would get much quicker spooling more torque and power. After turbo restrictions can really cut down on power and how quickly a turbo can spin up.
My little blue zed is in lots of bits. With lots of things started and not many finished! I may have found the limits of my time and ability!!

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Smartbear
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Exhaust modification

Post by Smartbear » Mon Sep 25, 2017 3:56 pm

Machine monkey wrote: Mon Sep 25, 2017 11:05 am
Smartbear wrote: Mon Sep 25, 2017 10:18 am
Ducklakeview wrote: Thu Sep 21, 2017 11:25 am

There are lots spread through the thread. I'll try and repost them all in one place later.

Mike
Any exhaust mods to the 2.0 turbo mike?
Rob
The best mod for your exhaust Rob would be a bigger down pipe from the turbo. And then bigger bore and better flowing silencers. With that and a tune i bet you would get much quicker spooling more torque and power. After turbo restrictions can really cut down on power and how quickly a turbo can spin up.
Thanks mat but I meant have you carried out any mods to the 2litre yourself? I'm curious what effect the small front box makes when it's removed/modded?
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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Machine monkey
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Exhaust modification

Post by Machine monkey » Mon Sep 25, 2017 7:00 pm

Depending on its make up there could be a performance gain from removing it. Especially if it hinders flow. The better the flow closer to the turbo the better.

Never done any work to them.
My little blue zed is in lots of bits. With lots of things started and not many finished! I may have found the limits of my time and ability!!

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Exhaust modification

Post by SteveSmith » Mon Sep 25, 2017 8:56 pm

I think I'm now committed to going down the dual rear system, 35i style. Not trying to make out it's something it's not, I just prefer that look.
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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Exhaust modification

Post by dvd112 » Thu Sep 28, 2017 6:44 pm

So .... got the centre silencer removed today.

Drove it home. Definitely more low down chatter. Performance seems the same at the moment with a little more throttle response. But marginal.

It is not loud by any stretch of the imagination vs. My mini fjcw but it does sound more aggressive.

More to follow once I have driven more ! But for 100 bucks definitely worth it for a laugh :)?

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Exhaust modification

Post by Smartbear » Thu Sep 28, 2017 7:22 pm

dvd112 wrote: Thu Sep 28, 2017 6:44 pm So .... got the centre silencer removed today.

Drove it home. Definitely more low down chatter. Performance seems the same at the moment with a little more throttle response. But marginal.

It is not loud by any stretch of the imagination vs. My mini fjcw but it does sound more aggressive.

More to follow once I have driven more ! But for 100 bucks definitely worth it for a laugh :)?
Sounds like an improvement over standard, any chance you could post a sound clip for us?
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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Exhaust modification

Post by dvd112 » Thu Sep 28, 2017 8:04 pm

I sure can. Will head out later and do it.

It is a definitive improvement over standard and a more measured upgrade vs a full system.

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Exhaust modification

Post by dvd112 » Thu Sep 28, 2017 10:21 pm

N.B no drone at all on this one. As the car heats up its starting to sound better. video soon

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Exhaust modification

Post by dvd112 » Fri Sep 29, 2017 7:27 am

Update, cold start this morning in comfort mode, car is definitely louder, turbo spool is also louder for some reason (maybe someone can tell me why)
in sport and sport + it chatters a lot, it sounds a bit strange, maybe I just need to get used to it, but has lots of depth, growl and chatter low down but little difference up the rev range ( maybe someone can tell me why also)

Verdict is do it guys :thumbsup: try it out for 100 quid you cant go wrong and it 100% makes a difference probably not as much as I would have thought/hoped from doing this on other cars but good enough fun.

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Exhaust modification

Post by Smartbear » Fri Sep 29, 2017 8:41 am

dvd112 wrote: Fri Sep 29, 2017 7:27 am Update, cold start this morning in comfort mode, car is definitely louder, turbo spool is also louder for some reason (maybe someone can tell me why)
in sport and sport + it chatters a lot, it sounds a bit strange, maybe I just need to get used to it, but has lots of depth, growl and chatter low down but little difference up the rev range ( maybe someone can tell me why also)

Verdict is do it guys :thumbsup: try it out for 100 quid you cant go wrong and it 100% makes a difference probably not as much as I would have thought/hoped from doing this on other cars but good enough fun.
Sounds promising, sound clip!
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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Exhaust modification

Post by dvd112 » Sun Oct 22, 2017 2:06 pm

Hello, sorry it took so long to post the video. I have been running the mid section delete for a few weeks now.

It’s sounding good, no drone. Not so loud and difficult to hear under load. Turbo whine is louder though.

Cold start is good, throaty and does sound similar to my old mini r56 fjcw. It will pop and bang - loudly - but post cold start it’s quietens down a lot.

Below I have a video of a warm start. I think the flap in the exhaust is still closed. But it gives an idea of the sound. Next up I am going to do the exhaust flap mod. Update to follow.

https://youtu.be/0aY2jrpIfn8

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Exhaust modification

Post by dvd112 » Thu Nov 02, 2017 5:31 pm

anyone any thoughts???? :D

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Exhaust modification

Post by SteveSmith » Fri Nov 03, 2017 9:53 am

It’s really hard to tell from a video how it sounds in real life, but it’s pleasing to hear that it’s not droning!

I’ll get mine done soon! I want the farts on upshifts to be louder and a few more pops on overrun!
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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Exhaust modification

Post by dvd112 » Fri Nov 03, 2017 3:05 pm

remove backbone completely then and keep centre silencer.will try and get another video soon

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