Capped Helmholtz chamber (Drone Eliminator)

[GXPaycheck]

Ha ha! Where do you think Solo got the idea! It started here

[DRT G8 GT]

anyone know a good shop in Houston they would recommend to weld up a set for my G8?

[brentsten]

anyone know a good shop in Houston they would recommend to weld up a set for my G8?

I'm about to put mine up for sale. No drone, but too loud for me. Shoot me a PM me if you're interested.

[DRT G8 GT]

Already had the capped up J pipes, went to Lone Star Muffler in Pasadena. Took care of all of the drone 40-65 and about half above that to 80

[BigRed585Lbs]

Good video for the dead forum (if anybody still cares) (or is still here).

https://www.youtube.com/watch?v=DEBikp8Jce0

[joehall1975]

BigRed, I've been reading the thread over at the other place and i'm thinking about doing the same thing. I have the same exhaust and while i love the sound there are times that i think why the hell does it have to get so loud. Normally i end up in the highway in 5th because the drone is annoying when my wife is in the car. Now all i have to do is find a good place here in town that won't charge me an arm and a leg to do this. Maybe your mod and some dynamat?

HAHA! I realize this is an old post but I had Phil tune my car which has close to the same mods as yours and mine was 343/364!!

[BigRed585Lbs]

Shameless bump by OP

[BuildItYourSelf]

I have been reading a little on this chamber idea.
You need a specific volume of pipe or is the length more important?
The setup in question is a 3" exhaust. If I need say 27" of pipe I can use 2.5" pipe because the u bend is tight enough. But if I use 3" it's to tight but if you go with the same volume I don't need the bend.

And another question. Can you do a single chamber off of the x pipe or H pipe to cancel or is it more effective to do each pipe? Also is it better to do the front, middle or back?
If I can do it in the middle I have all the room I need because it's a truck. That's just a 90 and straight with the pipe.
Thanks

[BigRed585Lbs]

Like she said, "It's the length that's important". That's what tunes to the frequency you're trying to negate. Like a trombone, move the slide and the tone changes.

Here's a couple of shots of ones used on trucks:



Ford guys are really inventive:


Hope this helped.

[BuildItYourSelf]

Yeah it does. Thanks.
When reading up on the theory behind it all seem to show the round ball and mentions the critical aspect being the neck. But they also seem to be for compressors and flow of gas. Almost like a cushion chamber in a water line.