Advice for ported box in E46 M3 Trunk. DC2K. 2 XL12's.

[Wicks]

you can do part external and part internal aero ports

Yeah good suggestion, I do have some room between the top of the box and the rear deck.

I tried playing with that in Torres, but it barely seems to affect the tuning at all.

Am I missing something?

I would think that port length wouldn't matter internal vs external.

[Wicks]

OK Guys,

What do you think about this:

Looks like it should fit all the suggestions.

Now I just need to figure out how to run all that port in the box...

Looking at a couple 6" aeroports from PartsExpress (plus some bends and extras).

Edited February 20, 2012 by Wicks

[412 CVX]

you can get away with 12 sq inches of port with round ports. especially if you flare the ends.

i would at least add some bracing to that box, or do a double baffle. those subs are heavy mofos.

otherwise looks good

[Wicks]

you can get away with 12 sq inches of port with round ports. especially if you flare the ends.

i would at least add some bracing to that box, or do a double baffle. those subs are heavy mofos.

otherwise looks good

Cool, thx for the advice.

So I drew up the design in Visio to see what it might look like before building and the 6" ports take up a lot of room and would be a bit complex trying to secure them properly in the box. Given that I'd really like to incorporate some plexi on the rear wall to show the motors, the ports almost conceal the entire sub.

If this was strictly for SPL and not looks then I'd probly go for it.

My second thought is a slot port, but running one down the entire width of the box gives me too much port area. I'm guessing a port that is 34.5" x ~1.25" wouldn't work very well.

So I'd want to split the slot port into two with one on each side of the box.

In Torres, would I just add the two slot Height's together for the calculation?

Example: I want two seperate ports that are 3"H x 10"W x 20"L. Do you enter them in Torres as: 6"H x 10"W x 20"L?

[Wicks]

Bump.

Two main questions at the moment:

Would a slot port that is 34.5" x ~1.25" be too narrow and cause noise? Gives the proper port area, but I'm pretty sure its not wide enough?

Torres Calculator:

If I have two seperate square ports, do I add one of the width measurements together and keep the length the same so it calculates as one big port?

Example: I want two seperate ports that are 3"H x 10"W x 20"L. Do you enter them in Torres as: 6"H x 10"W x 20"L?

[412 CVX]

shoot for about a 1:6 ratio.

[412 CVX]

shoot for about a 1:6 ratio.

and yes, add the widths together, buuuut single larger port is generally better

[Wicks]

shoot for about a 1:6 ratio.

and yes, add the widths together, buuuut single larger port is generally better

Yep, what I figured...too narrow.

Got it, I'd rather go for a single simple port but I'm aiming at porting up through the middle of the rear deck.

With that goal and the required length of the port, it works nice to split two ports across the top of the box.

Also makes it symetrical for each sub, which I'm hoping will help against different loading conditions for one of the subs if I used only one port opening on one side of the box...

I think I've got my game plan, thank you Sir!