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View Full Version : Port Help and someone who runs LARGE aero's



grimreper912003
02-06-2009, 11:19 PM
I have a Mach5 MJ 18 going into my tahoe soon so I'm going onto the box stage. Im thinking 5 Cubic feet after Displacment using an 8" sono tube as the port tunned to 30hz. Now my question is, My width is 48 on the truck, so If I made the box 46" wide, can I fire the port at the wheel well? Yould this choke the port? I;m looking to move some pretty decent air.

basebalz13
02-06-2009, 11:21 PM
the port is 8" wide so you need at least 8" from the back wall on the inside of the box and also any flat surface on the outside of the box, but jeez 8" aero???

grimreper912003
02-06-2009, 11:24 PM
the port is 8" wide so you need at least 8" from the back wall on the inside of the box and also any flat surface on the outside of the box, but jeez 8" aero???

Why not. Only 50 sq in of port area.

basebalz13
02-06-2009, 11:28 PM
yeah tru, i mean i might would just use 1 6" aero' up to you tho, but make sure u leave enough room for how big the aero is, get wat im sayin?

grimreper912003
02-06-2009, 11:31 PM
yeah tru, i mean i might would just use 1 6" aero' up to you tho, but make sure u leave enough room for how big the aero is, get wat im sayin?

Yea, I go it. Might have to run slot port as I dont want the depth of my box to be so long (24.25 +8+32.25" Internal) Even 6" are pretty long to run subs up port back

RidnClean
02-06-2009, 11:32 PM
i think you're cutting it close with it being 2" from the well.

grimreper912003
02-06-2009, 11:34 PM
i think you're cutting it close with it being 2" from the well.

thats what I thought :crap:

grimreper912003
02-06-2009, 11:57 PM
How about this instead. Low and move air is the goal. Loudness is nice too :D

Its 5.21 cu ft after Port displacment. 74 Sq in of port area (18.5" x 4") Tunned to ~30 Hz

http://i121.photobucket.com/albums/o225/grimreper912003/521cuft30hzw74sqinportareapic.jpg

myhcca15
02-07-2009, 12:00 AM
Yea, I go it. Might have to run slot port as I dont want the depth of my box to be so long (24.25 +8+32.25" Internal) Even 6" are pretty long to run subs up port back
i was going to run at 8" aero also and i had the same problem so im going to a slot port now:crap:

gotparts90
02-07-2009, 04:20 AM
use pvc and get an elbow the port it forward. The 90 adds more than its length to the ports resistance I don't remember how to figure it out anymore I had a way to do it long ago.

amartin_72
04-24-2009, 11:15 AM
straight port no elbows

JBLCAMRY
04-24-2009, 11:20 AM
screw the 8", go with 10"

http://i228.photobucket.com/albums/ee174/kirbycamry/100_2349.jpg

maritoze
04-26-2009, 10:39 PM
screw the 8", go with 10"

http://i228.photobucket.com/albums/ee174/kirbycamry/100_2349.jpg

Oh my:crazy:

armed
04-27-2009, 01:13 AM
why 10? get a bucket!

http://i18.photobucket.com/albums/b103/sarhento/madison140.jpg

i hit 148 if i remember it correctly...

2 18s strokers...we just did it for fun...

i actually competed with it..

yeah, i got laughed at LOL

luv2shrOOm
05-07-2009, 02:17 AM
why 10? get a bucket!

http://i18.photobucket.com/albums/b103/sarhento/madison140.jpg

i hit 148 if i remember it correctly...

2 18s strokers...we just did it for fun...

i actually competed with it..

yeah, i got laughed at LOL

O M G !!!:eek:
SICK......

Millertime1028
05-07-2009, 02:54 AM
When using round ports you are able to get away with half of the ports overall diameter as the distance between the port opening and the vehicle itself. In some cases as like in mine, I gain roughly 1+ db by preloading the ports against the back hatch. Right now the ports are exactly 5.5 inches off the rear hatch and im running 10 inch ports. Done testing and so on and this specific placement of the box is the loudest. What im saying is you really have to experiment with box placement and so on. If you have an 8 inch round port, 4 inches of room will suffice, maybe even 3in. If you can design the box in way to gain a tad bit more room for the port clearance it would be nice to have that extra room to mess around with the box placement to see what works best in your truck. If you use pvc, and have to use elbows, to measure the elbow you will basically measure from the dead center of the openings of the elbow to the center of the 90 degree bend then do this from the other opening of the elbow and there ya go. Add the two measurments together and thats the usable length of the elbow. This has got pretty accurate results as far as achieving the correct tuning for box's when using elbows. Sonotubes ftw
http://i43.tinypic.com/153qh6x.jpg
....
http://i40.tinypic.com/25k4t8w.jpg

MakeshiftAudio
05-07-2009, 03:04 AM
Buckets, very nice. I'll have to remember that.

Millertime1028
05-07-2009, 03:07 AM
And yea, the buckets are where its at lol.

Lakota
05-07-2009, 10:48 PM
That's pretty bad that they couldn't even take the handles off lol