Im just curious about people using subwoofers in the firewall, does the heat effect the subwoofers in any way? I thought that would be a good spot for a sub cuz then when i need to i can just remove the sub and have access to the sparkplugs too lol. Bonus How does it sound mounted that way?

Do a search, I beleive that someone has done that.

I can't remember the thread though.

John

quote Originally posted by 1986GTV8: Do a search, I beleive that someone has done that. I can't remember the thread though. John

I know people have done it, im just wondering if any long term problems have been found by people who have done it.

Biggest problem I can foresee is that the fuel filler tube runs diagonally behind the drivers seat between the passenger compartment and engine compartment...INSIDE the void that would be your enclosure...blocking part of the area where your sub would more than likely be sitting.

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--David

Black '86 GT-under construction
Silver '87 GT-daily driver

The firewall is double walled. When you cut through from the inside you reveal a small cavity. The small cavity is not large enough to mount a speaker it's only about 2 1/2 inches deep. But it gives enough room for the magnet of a large subwoofer and allow you to build your enclosure to a smaller depth.

You REALLY don't want to cut all the way through into the actual engine compartment. It's called a firewall for a very good reason. You would likely asphixiate yourself with carbon monoxide poisoning as well.

Driver's side

[This message has been edited by jscott1 (edited 07-25-2007).]

I cant say that I've had any problems with my 8 inch sub install yet because it isn't finished.

But I thought i would speak up since it seems there aren't many firewall subs out there (I'm not counting console mounted subs of course).



I only have the passenger side hole for now. I'm not sure if I will need the drivers side or not
because one sub might just be enough bass. That's the way I have planned it anyways.

However, the drivers side can be done but you will have to relocate the relays and the fuel filler pipe probably will be an issue and perhaps the air filter as well (V6 car). Yep, have to move some stuff.

An enclosure will be necessary in my opinion. One of the earlier posts eluded to the fact that it would just be a speaker stuck in the hole.

Never mind the danger of fumes coming in the passenger compartment, the speaker itself would deteriorate from the heat and from the rain water, or the car wash spray or a bunch of other things that could happen there.

I have relocated my battery, so the area behind my sub is clear for an enclosure.

[This message has been edited by 308 Ferrari Kit (edited 07-26-2007).]

quote Originally posted by 308 Ferrari Kit: I cant say that I've had any problems with my 8 inch sub install yet because it isn't finished. But I thought i would speak up since it seems there aren't many firewall subs out there (I'm not counting console mounted subs of course).

Just curious... why are you putting your sub way up there? Does the sub have a deep basket that makes it unsuitable to mount near the floor?

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3.4L S/C 87 GT www.fierosound.com
2002/2003/2004 World of Wheels Winner &
Multiple IASCA Stereo Award Winner

quote Originally posted by 308 Ferrari Kit:

Well there is a first time for everything. I've never seen anyone actually cut through the firewall. Make darn sure your enclosure is airtight or you are going to get serious heat, smoke and vapors into the cabin and it's not going to be nice.

The biggest problem i can see will appear when you try to sell the car and someone sees those huge holes, even if they are covered with a speaker ....

Here was my build with many of the helpful threads attached. https://www.fiero.nl/forum/Forum1/HTML/064567.html
I ended up removing the one behind the drivers seat and opted for a center console sub instead. There was a big difference in performance with the sub compared to the passenger side. Probably because of the smaller amount of space with the fuel lines. Plus the seat was fine for me but it wouldn't move all the way back and if I brought it in for service somewhere a tall mechanic probably wouldn't be appreciate that
Marc

I put mine in the double wall area down low - like in jscott1's pic. or more like fierosound's pic - both sides, kinda square.
then, made a fiberglass shell to fit the hole. the dbl firewall area is NOT that big, or very deep. like someone said - adds maybe 2"
the speaker generates WAY more heat than what is transmitted thru the firewall. but, I also dont have a cat conv, which is right by the drivers side, and is a MAJOR heat soak source.

quote Originally posted by PaulJK: The biggest problem i can see will appear when you try to sell the car and someone sees those huge holes, even if they are covered with a speaker ....

Not a problem, the speakers will be concealed by carpet or a speaker material to blend in with the interior. They will be hidden.

Plus, if I ever get my kit finished, I doubt that I would sell it. LOL