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Z4M exhaust upgrade project

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D4dawg

Z4M exhaust upgrade project

Post by D4dawg » Mon Oct 16, 2017 8:28 pm

Nice work buddy

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Z4M exhaust upgrade project

Post by Mangozac » Wed Oct 18, 2017 1:12 pm

Thanks guys!
Fishy Dave wrote: Mon Oct 16, 2017 1:29 pm Excellent, looks like a much higher quality result of what I've achieved with mine. :thumbsup:
Dave, have you got a link to some info on yours?
Current: 06 E85 M Silbergrau
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Z4M exhaust upgrade project

Post by ph001 » Wed Oct 18, 2017 1:24 pm

This looks great..any chance of a vid on the sound :poke:

Only thing I would mention is that you will get pretty severe galvanic corrosion on that aluminium / stainless steel interface on the tips. It will eat away at the least noble metal (which in this case is the aluminium), so I would expect it to be in a pretty bad state after a few months. If you can find a way to electrically insulate one from the other it would make a big difference to the longevity.
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Z4M exhaust upgrade project

Post by Fishy Dave » Wed Oct 18, 2017 4:09 pm

Mangozac wrote: Wed Oct 18, 2017 1:12 pm Thanks guys!
Fishy Dave wrote: Mon Oct 16, 2017 1:29 pm Excellent, looks like a much higher quality result of what I've achieved with mine. :thumbsup:
Dave, have you got a link to some info on yours?
Sure: Max Power alert!!! viewtopic.php?f=9&t=94234&hilit=best+modification
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Z4M exhaust upgrade project

Post by Mangozac » Wed Oct 18, 2017 10:42 pm

ph001 wrote: Wed Oct 18, 2017 1:24 pm Only thing I would mention is that you will get pretty severe galvanic corrosion on that aluminium / stainless steel interface on the tips. It will eat away at the least noble metal (which in this case is the aluminium), so I would expect it to be in a pretty bad state after a few months. If you can find a way to electrically insulate one from the other it would make a big difference to the longevity.
This is actually a really good point. I knew galvanic corrosion is an issue in marine environments but didn't realise it would be much of an problem here. There has already been some white corrosion build up around the rings but I just put that down to perhaps being a reaction between the exhaust gases and the aluminium, so was thinking of perhaps ceramic coating the aluminium to fix it.

Unfortunately, insulating the two metals isn't really possible - the rings are held in place by a stainless set screw. I'll keep an eye on it - if worst comes to worst I'll have to work out another solution.
Fishy Dave wrote: Wed Oct 18, 2017 4:09 pm Sure: Max Power alert!!! viewtopic.php?f=9&t=94234&hilit=best+modification
Ahh nice, yeah I've read that thread before! That was my original plan using the BMW actuators before I had the M6 mufflers donated to me ;)
Current: 06 E85 M Silbergrau
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Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR

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Z4M exhaust upgrade project

Post by Mangozac » Sun Oct 22, 2017 12:35 pm

I have a video!

https://photos.app.goo.gl/y0SI80wZQbfsvtOt1

We did passes with the valves open and valves closed, but stupid me screwed up the valves closed videos and they were just photos instead :roll:

It was really interesting listening to the car from outside. Valves closed was much quieter than I thought, but still had a cool, almost exotic sound. Opened was pretty mental - I'll save that for runs with the M Club boys ;)
Current: 06 E85 M Silbergrau
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Z4M exhaust upgrade project

Post by Beedub » Sun Oct 22, 2017 8:36 pm

interestingly it sounds nearly identical to the RPI which you hate so much.....
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Post by Mangozac » Sun Oct 22, 2017 9:24 pm

Beedub wrote: Sun Oct 22, 2017 8:36 pm interestingly it sounds nearly identical to the RPI which you hate so much.....
The issue I had with the RPi was the sound level and the horrible drone. While both may have the same S54 raspy note, even valves open this is not as loud as the RPi. Valves closed there are no similarities and no drone at all :thumbsup:
Current: 06 E85 M Silbergrau
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Z4M exhaust upgrade project

Post by original guvnor » Sun Oct 22, 2017 9:25 pm

Admire the ingenuity of the design but I don't really think much to the sound. It's like a lot of the replacements exhausts - a sort of harsh bark/fart noise. I genuinely can't think of any aftermarket exhaust that I think has improved the stock sound apart from perhaps the AC Schnitzer/Rebus one.

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Z4M exhaust upgrade project

Post by wspohn » Sun Oct 22, 2017 9:36 pm

Beedub wrote: Sun Oct 22, 2017 8:36 pm interestingly it sounds nearly identical to the RPI which you hate so much.....
Actually, it is both louder and more annoying than my RPI exhaust is. Maybe he has never heard the RPI with enough mileage on it to be broken in. And coupes drone more than open cars do, yet my coupe with the RPI doesn't drone.
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Z4M exhaust upgrade project

Post by Mangozac » Sun Oct 22, 2017 10:37 pm

Obviously the audio has done a very poor job of capturing the sound. Friends who heard both the RPi and this have all commented how much better this sounds,
Current: 06 E85 M Silbergrau
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Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR

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Z4M exhaust upgrade project

Post by tom21 » Tue Nov 07, 2017 1:49 pm

love my supersprint powerloop setup. Not too loud but still gives it a great sound. All the best with your project :driving:
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Z4M exhaust upgrade project

Post by MrPT » Tue Nov 07, 2017 5:33 pm

original guvnor wrote: Sun Oct 22, 2017 9:25 pm Admire the ingenuity of the design but I don't really think much to the sound. It's like a lot of the replacements exhausts - a sort of harsh bark/fart noise. I genuinely can't think of any aftermarket exhaust that I think has improved the stock sound apart from perhaps the AC Schnitzer/Rebus one.
Why is it that we only seem to have the vuvuzela option? Is it just a characteristic of inline 6s that the exhaust tone isn't very "complex".
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Z4M exhaust upgrade project

Post by Mangozac » Wed Nov 08, 2017 3:53 am

MrPT wrote: Tue Nov 07, 2017 5:33 pm Why is it that we only seem to have the vuvuzela option? Is it just a characteristic of inline 6s that the exhaust tone isn't very "complex".
Haha I laughed at the vuvuzela comparison!

Sure, inline 6s are never going to have a luscious a sound as an engine with more cylinders, but even within the realm of 6s the S54 seems to be worse than others. I presume the high redline doesn't help!

This exhaust solution of mine is still a bit buzzier than I'd like, so I'm looking into building Helmholtz resonators to filter out some of the higher end noise...
Current: 06 E85 M Silbergrau
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR

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