Beastwood's quarter-wave resonator calculator (google docs)

[Clint Beastwood]

Feel free to check it out and hit me back here with questions/comments. My use-case for this was my FiST and a V8 audi; I have not tested extensively with every car/exhaust combination, so I am not sure how something like a v8 with true duals and an x-pipe would be calculated (pulses per rpm -> frequency), but if you get the frequency via a spectrum analyzer the rest of the sheet works fine. Please copy the calculator to your own google drive and use it that way. As it always needs to be said, I am not responsible for your use of this tool, it's just the reference I have been using for myself and as there are a ton of environmental variables you need to pay close attention when utilizing it.

https://docs.google.com/spreadsheets/d/1lDwwrAibQa-cqZWlNG-Y04wATCq5bGZLWIsL7phyHBo/edit?usp=sharing

 

[Clint Beastwood]

Reserved for responses

 

[RubenZZZ]

Could this be used to figure out how to lose the drone associated with running dumped, 2-chamber Flomasters?

I love the sound but hate the drone at cruise speed...

Sent from my LGLS992 using Tapatalk

 

[Clint Beastwood]

Could this be used to figure out how to lose the drone associated with running dumped, 2-chamber Flomasters?

I love the sound but hate the drone at cruise speed...

Sent from my LGLS992 using Tapatalk

Absolutely, thats exactly what it's for

Figuring out the length of the required chamber isn't too hard, on all the Fiesta's I've seen it winds up being 3200 rpm or 106.67hz - what's hard is figuring out where to fit nearly 32" of pipe. I think your flowmaster has a rear muffler, so you're going to have to find an exhaust shop willing to get creative. The only way I was able to fit the piping was not having a rear muffler.

 

[RubenZZZ]

Absolutely, thats exactly what it's for

Figuring out the length of the required chamber isn't too hard, on all the Fiesta's I've seen it winds up being 3200 rpm or 106.67hz - what's hard is figuring out where to fit nearly 32" of pipe. I think your flowmaster has a rear muffler, so you're going to have to find an exhaust shop willing to get creative. The only way I was able to fit the piping was not having a rear muffler.

I'm thinking of using this for my Chevelle. It drones like a mofo.

Sent from my LGLS992 using Tapatalk

 

[Clint Beastwood]

I'm thinking of using this for my Chevelle. It drones like a mofo.

Sent from my LGLS992 using Tapatalk

Neat! There should be tons of room! Is it true duals or is there a crossover?