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View Full Version : best box style for an RX7?



k_schutte
11-19-2009, 09:49 PM
I have decided to put some tunes in my drag car for when I take it on the streets... I was wondering what you think would be good for a pair of Kicker L5 8"s an about 300~ rms each?

this is not my car but its the same exact thing.... I was going to do a simple slot port sub/port both rear facing. Can't seem to find many specs but I was thinking 36- 38 for the tuning...

http://img301.imageshack.us/img301/274/16377633173dc40ac6ab.jpg (http://img301.imageshack.us/i/16377633173dc40ac6ab.jpg/)

basscort2009
11-19-2009, 09:54 PM
l5s? those kinda ****. do mtx lowline 10s. i had one 8500 10 and it pounded hard as hell at 36 htz

DNick454
11-19-2009, 10:06 PM
For a hatch, do sub up port back.

k_schutte
11-19-2009, 10:49 PM
I have a pair of 8500 10"s but I am trying to keep the weight down as much as possible and I don't need crazy bass or anything, it's a drag car.

I am going to run the L5 8"s and a Sony "1200 watt" amp because I have them laying aound collecting dust. I am probably just going to do... ho much air space do you think these need? like .75ft^3 per sub or...? lets just say port back, subs up, tuned to 37hz

DNick454
11-19-2009, 10:53 PM
Little more volume than that. Those square 8's have the effective cone area of pretty much a 10. Closer to 1-1.5 cubes each. Kickers like alot of space too.

k_schutte
11-19-2009, 10:54 PM
I was thinking 1ft^3 each ot begin with but then I thought that might be a little too big... going to be wierd building a box this small...!

DNick454
11-19-2009, 10:58 PM
Actually, you weren't too far off. Kicker recommends .66 cu ft (minimum) to 1 cu ft. If you're trying to save on space, .75 should be fine. Might be hard achieving a reasonable tuning though with that small of a net volume though. Let's see some designs :)

k_schutte
11-19-2009, 11:19 PM
no pretty pictures but my first design came out to:

10" x 26" x 20" (1/2" MDF)
1.71ft^3 net
19.69in^2 port area (9" x 2.5" x 16" for the port)
35.95hz


This could be wrong due to the fact the program I am using only does .75-3" wood thickness. So I took off .25" from the demensions when I designed the box, not sure if that works or not... LOL

DNick454
11-19-2009, 11:28 PM
d00d, just use a single 6" aero port tuned to like 50 Hz for mad d33b33z y0

Upgrayedd
11-20-2009, 12:00 AM
Dont the little compartments behind the seats have a decent amount of room?

k_schutte
11-20-2009, 12:38 AM
Dont the little compartments behind the seats have a decent amount of room?

not in mine... one side holds my battery and the other side a 10lb nitrous bottle...

IDSkoT
11-20-2009, 12:44 AM
inFinitely Baffled.

dappa5
11-20-2009, 09:36 AM
will sound decent but will it be removable for racing?
I'd prob do a bit more design for aesthetics but all will be well
I've been pleasently pleased with the few L5's I've installed for customers g/l

DBFan
11-20-2009, 09:37 AM
kill yourself OP.

k_schutte
11-20-2009, 12:28 PM
yes, it will be easily removeable for when I take it to the track... It just ****** this summer when I took it on the streets I didn't have ANY music. So, I have a JVC deck, sony amp, some coaxials and the L5's laying around and decided why not...only going to add like 7lbs~ (not including subs/box/amp) and in a 2400lb~, 600HP+ car I am not going to worry too much about that!

k_schutte
11-21-2009, 06:10 PM
Well, I would like to do an aero/round port now rather than a slot port. How do I calculate how big of a port I need and how long.

I can get a aero or a 4" X 17" aero port tube or a 6" round port (PVC pipe)

Twisted_0912
11-21-2009, 06:13 PM
Well, I would like to do an aero/round port now rather than a slot port. How do I calculate how big of a port I need and how long.

I can get a aero or a 4" X 17" aero port tube or a 6" round port (PVC pipe)

what year rx7 do you have?

http://www.psp-inc.com/tools.html

k_schutte
11-21-2009, 06:18 PM
what year rx7 do you have?

http://www.psp-inc.com/tools.html

its a '90... currently has a 5.0HO converted to carb, MSD ignition, HEI dist., LT headers, single plane hi-rise, Holley 650, NOS wet kit, Jacobs Nitrous Mastermind, 4.10:1 LSD, weight reduction, etc.... building a 408W for it right now but that won't be going in until I get a few more passes on the 302 this spring... 302 has me in the mid 10's already, should break 9's with the 408 and less squeeze

I was just getting on here to put that I found that site and got it figured out LOL... going with a 4" X 12~" flared port for 35hz-36hz