Sound Generator Modification

Phil H
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Re: Sound Generator Modification

Post by Phil H » Sat Mar 08, 2014 11:28 pm

You can take a cross blade screwdriver and remove the two screws that hold the panel beneath the glove box and just pull the foam from within the pipe, then just replace the cover and screws. Probably takes 5 mins :thumbsup:
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Re: Sound Generator Modification

Post by Fanatic » Sun Mar 09, 2014 2:34 pm

NathanZ4C wrote:Done this mod today :evil:

For those who haven't done this yet. I managed to pull the rubber grommet out of the bulkhead when I pulled on the pipe as it was attached to the pipe. I spent about 30 mins trying to get the pipe and grommet back in together. This didn't work. I later realised that the pipe separated from the grommet. I could then put the grommet in first and then pop the pipe back in afterwards which was far easier.

Another easier way to do it is when the engine is warm. This makes the plastics softer and very easy to take apart and put together. :thumbsup:
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights. :driving:

Sav
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Re: Sound Generator Modification

Post by Sav » Wed Apr 02, 2014 12:13 am

Turns out mine already had the mod done. Was a little bored of the noise so drove it with it completely removed. Sounds good but the rattle in the interior is too annoying. So parked it back up at home, cut a 1/3 out of the remaining foam and will see what its like in the morning. Need a CAI I think :?

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Re: Sound Generator Modification

Post by evom3z4 » Mon Sep 01, 2014 6:04 pm

Excellent post, did this last week though it took me forever trying to get the rubber grommet back in. AS someone suggested you can take the rubber grommet off the tube and put it in first then push the tube back through the firewall.

Ok so the results....

When taking out the big foam (closest) to firewall... WOAH!!! The best way I can describe the sound is the same as a vr6 with a k&n induction kit, those of you who are old enough will know what I mean, its loud! At 10% throttle she sounds normal but as soon as you push the loud pedal even at low revs she sounds so beefy and when you hit 4500rpm plus its near deafening!! Its fun for a short while but was too loud and I missed the smooth sound with the rasp of the straight 6.

So I then replaced the big Foam and took out the small foam, now she sounds 10% louder not 90% louder! A slightly beefier sound but nice and smooth and raspy with it.

Top mod and only takes a few minutes!
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TheHoff
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Re: Sound Generator Modification

Post by TheHoff » Sat Sep 20, 2014 5:14 pm

Removed the large piece of foam, and kept the smaller inside.

Very pleased with the results - sounds much more like a sports GT now.

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Re: Sound Generator Modification

Post by Jonski » Mon Oct 20, 2014 9:49 am

Just wanted to post a thanks guys.

I am new to the forum but OLD to Z4's.

My current Black/Black Z4 Coupe 3.0si (07) had 1 previous owner and 28k miles when I picker her up 2 months ago.

This weekend I completed the steps below and removed BOTH the foam parts from the pipe and WOW it now sounds like it should IMHO. I can see why some people, go half way with 1 of the foam only but having tried with both out I could no bring myself to putting one back :D

I have used information and assistance from these boards for years so this is a Thanks from a very happy Z4 driver in N.London.

I am now fishing for the key information which will help me choose a performance exhaust for the Z will be a 2 pipe as I have decided to stay as Stock as possible (looks wise) and don't want to cut into the bumper for Quads or replace with M bumper.

I know its being discussed on many posts but I would appreciate an up to date confirmation on whats sounds best but NO Drone! Budget is £800 ish.

I live near Enfield can anyone suggest a proven specialist for this work in my neck of the woods?

Cheers again

Jon

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blobslosak
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Re: Sound Generator Modification

Post by blobslosak » Sun Nov 23, 2014 1:35 pm

Oh my god. I thought people were exaggerating but seriously, what a difference. I can now fully believe that both foam pieces removed is deafening, just the firewall side one removed is epic as it is :D
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Re: Sound Generator Modification

Post by Bing » Mon Nov 24, 2014 8:35 am

Nobody ever exaggerates on this forum. Fact.

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Re: Sound Generator Modification

Post by blobslosak » Tue Nov 25, 2014 6:45 pm

I read something about ears bleeding :? :P
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andrewr
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Re: Sound Generator Modification

Post by andrewr » Tue Nov 25, 2014 7:40 pm

Having driven round for the last three years with the foam removed, one piece and then both pieces, I've now put both pieces back in and have to admit that I think this is the best sound for me. I know others prefer the noise, but to me The sound is very on/off whic just sounds too artificial to me. It's also much quieter on the motorway.

Andrew.
Z4 3.0i: Sterling Grey, 107 Ellipsoids, Sat Nav, Folding Mirrors. PDC, De-tongo'd, Heated Electric //M Seats. H&R Springs

MatthewsE86
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Re: Sound Generator Modification

Post by MatthewsE86 » Mon Jan 12, 2015 10:19 am

So can i ask the best way to do this mod for a bit more sound is to take the small foam out Air box side?

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Jordnm88
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Re: Sound Generator Modification

Post by Jordnm88 » Sat Feb 21, 2015 4:24 pm

Finally got round to doing this today, amazing sound! Thanks for the guide :thumbsup:
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Tweez
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Re: Sound Generator Modification

Post by Tweez » Sat Apr 04, 2015 4:39 am

:D :D Hey just wanted to say thanks after reading this post, I gave this a try WOW I took both filters out. And now what a great sound the car make @2500rpm +
I was giggling like a kid in a candy store. :driving:
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Uncle_Gravy
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Re: Sound Generator Modification

Post by Uncle_Gravy » Sat Jul 25, 2015 11:32 pm

Might give this a go tomorrow, One of the pieces was already taken out when I got the car, interesting to see what she sounds like with no foam.

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Steve84N
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Re: Sound Generator Modification

Post by Steve84N » Sun Jul 26, 2015 7:54 pm

Phil H wrote:You can take a cross blade screwdriver and remove the two screws that hold the panel beneath the glove box and just pull the foam from within the pipe, then just replace the cover and screws. Probably takes 5 mins :thumbsup:
I decided to do it this way as it's cleaner than delving into the engine bay.

It is easy but also watch out for the plastic rivet in the middle and don't yank the trim all the way off until you've unplugged the footwell light.

:)
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