Thread: BMW Z3 Trunk

I have done a complete Z3 setup. There are 2 places to get to the trunk.

You need to remove the liner behind the seat. On the driver side of the back you will have an access hole for wires. If you need power the battery is located in the trunk as well as the amp for the BMW system. The other location is where the amp is passenger side in the trunk on the wheel well.

One word of warning if you replaced the standard amp with something well more powerful and you live in a place where it gets hot your computer will overheat. The Z3 trunk is for the most part sealed and heat has no where to go. I know this from experience.

thats helpful. I already found the set of holes that pass under the roof when it is open and the holes under the liner. But, I didn't know about the heat issue. I'll just have to see what happens as I live in southern texas and yea, you could say that it gets hot in the summer and the winter too! I have a secondary mounting spot, right between the two rollbars. On the center hump. I can use that too, but didn't want to, we'll see.

yea, it does, thank you. that's what I decided to do also, but I am having trouble finding a 6.5" sub that can handle 200 watts. That's what my current amp does for the fifth channel. I am now thinking of maybe selling that amp and purchasing a smaller, less powerful amp for the car. Or moving it to my pickup. Finding 5.25 and 4" speakers to handle the 150 watts RMS that the rest of the channels output has been a pain in the arse also!

Originally Posted by kurtm

I have a 10" Focal sub in the trunk as well, With the top Down I seem to get descent sound however it does kind of suck for what I paid for the system.
I was going to custom install it behind the seat but the gas tank is right behind the seat so that was out

I've talk to a few others who have done stereo upgrades in Z3's and they've found best sound with upgrading the factory speakers

Hope that helps.

I know a few people who put the sub under the passenger foot well. they build a little box for it and it doesn't take too much room away. I find it funny people upgrade teh speakers I upgraded the amp and head unit and found out the speakers are fine they just weren't getting enough power. Yes new speaker would help with some of low end more but factory one work great if they get power. I too am looking for a place to put a nice sub but I need my trunk space.

BTW before I had the heating problem in my trunk I made a little self to stick my computer on were the CD changer would go. worked nicely too until summer came

Currently my setup is in the works again hope to put it under the passenger seat I think I have the room after I get past the power seat motors. I know people who put bass shakers there so there must be some room.