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      05-22-2007, 07:41 PM   #1
sixspeed
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Sound Generator Install 2.5 Z4 - *OP* Kevin

More Z4um How-To's.....


Here are the OEM part numbers you will need for installing the Sound Generator (SG) in a 2.5 Z4

1 13-74-7-514-863 SOUND GENERATOR 1
2 13-71-9-071-752 KIT 1
3 13-74-7-518-282 BRACKET 1
4 11-61-1-705-032 OVAL HEAD SCREW 1
5 07-12-9-952-121 CLAMP 1 (not needed provided with item 1)
6 13-74-7-514-864 SOUND PIPE 1
7 13-71-7-514-865 GROMMET 1
8 13-54-7-514-867 RUBBER BOOT 1

Total cost was about $92 shipped





Ensure the engine is cool !!!

Start by installing the black plastic bracket (item 3) using the oval head screw (item 4).
This bracket enables the SG to be secured to the engine block with the spring clamp.



Then remove the elbows to the air filter.





NOTE: You need to remove the plastic collar connecting the two original large diameter elbows since you will use
this collar NOT the collar supplied with item 8 the rubber boot.
This is because the 3.0 elbows are slightly larger in diameter than the elbows in the 2.5.
The elbow from the air filter box is semi rigid plastic and will not fit over the collar suppled with item 8.



Install and connect the original airbox elbow and the new rubber boot and the small rubber tube.
Before tightening ensure everything is aligned correctly.



Remove the solid grommet from the firewall and replace with item 7.Also pop out the piece of insulating felt that is behind the grommet
to open the path into the cabin.



Connect the sound pipe to the sound generator. Remove one, two or both pieces of foam that are stuffed in the sound pipe,
I removed the longer piece.



Install the combined assembly by latching the top of the SG over the air intake and securing the
bottom with the spring clip.






Push the front facing SG coupling into the opening in item 8 and secure the rear facing sound pipe in
the grommet in the firewall.

Check that you have reconnected all the elbows and tubes then tighten all the connections.

Job done in about 1 hour including taking the pictures.


Here is some additional information on how this thing works:

I would love to credit the following information, which I found on the web.

I believe the individual who researched this is writing a book. So if he/she identifies themselves I will gladly provide the credit.

Early in the development process, BMW began to research what customers prefer as a sporty sound from the car’s engine. Once again a roadster presents unique challenges to the engineers because the acoustics are much different whether the top is up or down.

The process began in the sound lab with people listening to different sound samples. These samples were engine noises but they had been synthetically created on the computer. The goal was to find the ideal roadster sound. This sound shouldn’t be so loud as to disturb one’s neighbors but it should be louder than a luxury sedan. The sound must be “solid” and correspond to what is expected from a BMW. These aspects were all combined and a sound target was designed. This sound target, which is stored as a computer file, was specified in terms of tone and decibel levels. But it also was somewhat subjective.
On the real car, the sources that contribute to the sound the driver and passenger hear include the engine itself, the air intake and the exhaust. The engine noise is very mechanical sounding and while, for example, a Ferrari’s sound is indeed very mechanical; BMW feels that their cars should be more refined.

For the 3.0-liter model only, a special “sound generator” was developed. “Sound generator” is a misnomer; “selective sound
filter” would be more accurate. In any case, the sound of the engine is managed in a very specific manner. The sound generator brings the sound back to the firewall to make it more apparent to the driver and passenger. In addition, this system filters out some of the naturally occurring sounds and selects others. The sounds that are selected for are those associated with a performance roadster. The result is a sound, especially upon acceleration, similar to a big V8 engine. Not only is the sound pleasing but it also provides feedback to the driver; the power is heard as well as felt.

In the BMW acoustic labs, the various components can be tested independently. On all three models, 2.2, 2.5 and 3.0 liter, the various sounds are graphed over the whole engine range. The characteristics can be mixed and tuned to complement one another. The process is almost like a musician mixing a recording. Testing is then done in an acoustic chamber with a rolling road. Final testing is, of course, done on actual roads.
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      07-26-2007, 07:49 AM   #2
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This is true for the 2.2 also, works a treat.
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Z4 2.2 Remapped, Cold Air Induction, Sound Generator
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      08-30-2007, 04:46 PM   #3
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2003 Z4 2.5i  [5.00]
where can i buy those parts?
over here where i live they are much more expensive
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      09-03-2007, 06:59 AM   #4
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      09-06-2007, 01:34 PM   #5
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I actually read somewhere where someone wanted to remove it from their 3.0i... I'm thinking, why?
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      10-05-2007, 09:21 PM   #6
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hmmmm I am thinking if I remove the foam then my z4 will sound even better?
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      08-21-2008, 09:28 AM   #7
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Quote:
Originally Posted by voltron1011 View Post
I actually read somewhere where someone wanted to remove it from their 3.0i... I'm thinking, why?
Less clutter in the engine compartment, fewer parts = less chance of vaccum leak, no real performance benefit, less noise in passenger compartment. If you want to hear the engine, go with an exhaust and pickup some (minor in most cases) performance.
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      08-21-2008, 02:59 PM   #8
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Thanks for the great writeup! I'm gonna try to get this done this summer!
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      06-18-2009, 07:07 AM   #9
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I ordered the soundgenerator for my 325Ci M54!! Thanks for this topic, super idea!

I only have a question about the installation: the original airbox elbow have two connections on the engine. One on the trottle housing, and the smaller other one above. This one is now used for the sound generator. But what must happen with the opening in the engine?

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      06-18-2009, 12:13 PM   #10
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Does anyone know if the N52 equipped Z4's also have a sound-generator? If so, I would think one could modify it for E90/92 cars.
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      06-18-2009, 01:26 PM   #11
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Quote:
Originally Posted by voltron1011 View Post
Does anyone know if the N52 equipped Z4's also have a sound-generator? If so, I would think one could modify it for E90/92 cars.
The N52 Z4's do have a sound generator, although it is much more involved. The attached photo was provided by another forum member.
To me it's more chances for a vacuum leak, I would prefer a simple intake tube from the air filter box to the throttle body. It also clutters up that area of the engine compartment.
Attached Images
 
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      12-29-2009, 05:17 PM   #12
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Quote:
Originally Posted by sixspeed View Post

NOTE: You need to remove the plastic collar connecting the two original large diameter elbows since you will use
this collar NOT the collar supplied with item 8 the rubber boot.
This is because the 3.0 elbows are slightly larger in diameter than the elbows in the 2.5.
The elbow from the air filter box is semi rigid plastic and will not fit over the collar suppled with item 8.
Hello there.
Can you help me a little bit with the above cause i havent understand it...

We must buy also the collars from the 3.0lt or not???

Actually i want to put it in a 325ti so a lot of modifications will need to be done,but this part i dont understand and i'm asking are the same..I have bought everything you have post in the first pic with the codes of parts,but on the second pic i see you have a collar too...

Waiting for your answer,and have a great new year
Thanks
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      04-22-2021, 03:39 AM   #13
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Great guide. Thanks OP. I ordered all the parts and followed the steps. Pretty strait forward.

One interesting thing is that because the airflow from the intake in the 2.5 is less than the 3.0, the sound generator only engages at really high accelerations. But that's ok, I like it that way.
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