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Shomare and I were browsing around the 2012 SEMA show about a month ago, and we stumbled a crossed The Green Filter. What we were so impressed with, was the air flow that the filter had, versus other brands. So I filmed a short 15 second product demonstration. I knew that I would be getting one of these filters for my car as soon as I saw this, and I wanted to share with everyone. Pay attention to the little ball..


So, after the demonstration I asked what the filter was for the Focus ST.

Filter Number: 7159
Product Website:
https://www.greenfilterusa.com/store/7159

from website about the product...


  • Maximum air flow for more power & torque
  • Improves engine efficiency (better gas milage)
  • Washable and resuable filter is environmentally friendly
  • Super strength to withstand engine intake pressure
  • Highest quality control on rubber injection molding
  • Pre-oiled so they are ready to install right out of the box
  • Extra pleats used for maximum surface area
  • Woven cotton to insure the greatest flow of air
  • Will NOT void vehicle warranty
  • Limited lifetime guarantee
  • Superior filtration
  • Race proven
  • Made in the U.S.A

So The Green Filter is a cone filter, and it is steel mesh construction. Since installed I love it. The sound is great! You can hear the turbo, and there is a very nice whoosh sound when the air flow is sucked, then stopped. It makes the engine a little lower, and the exhaust a little louder. It really sounds cool when you are "on" the car.

Sound

There is no way for me to determine if the filter makes the car faster or not. I don't feel a difference, the only way is to dyno. Every filter says that they increase mileage, and power. Someone needs to test this.

I have not seen a decrease is mileage, if anything a modest increase. But I don't have any data to back that up. I know my car doesn't get worse mileage. In the past, other cars I have got worse mileage with a filter. This is a great enhancement to the car, without doing a complete Cold Air Intake.

Install


Take 4 bolt screws out.



Pop the cover off



Pop the filter out. May take a bit a of work.

Install by slipping the filter over the hose intake, with the clamp. Do not over tighten clamp, or the filter will pop off. Just get a firm grip and it will not go anywhere. Mine has been installed for a month with no problems.


Reinstall cover and enjoy!

 

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Very cool demonstration video, definitely makes it easy to compare vs. K&N and stock. But performance aside, it just sounds awesome. To me, the price of the filter is worth it to have that sound. It would be interesting to see if there were some gains though. Great work!
 

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Yes, that sound yesterday was very cool indeed!

Question... on your car you had the round piece on the end of the box open... does that just pop apart of did you have to cut it open... sorry, if you told me yesterday... being an old FART i suffer from CRS... ;)
That round piece is part of the filter. The green filter doesn't have it covered.

I could kick myself. I had just ordered a K&N otherwise I would have purchased the Green Filter.

The K&N doesn't change the sound like the Green Filter does and the Green Filter obviously flows better than the K&N as seen in Chads video.
 

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That round piece is part of the filter. The green filter doesn't have it covered.

I could kick myself. I had just ordered a K&N otherwise I would have purchased the Green Filter.

The K&N doesn't change the sound like the Green Filter does and the Green Filter obviously flows better than the K&N as seen in Chads video.
D'oah!!! NOW i understand!!! Wasn't quite getting it yesterday... Now with the visuals, i get it!! LOL!

thanks for explaining it!
 

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...The K&N doesn't change the sound like the Green Filter does and the Green Filter obviously flows better than the K&N as seen in Chads video.
I'm a diehard skeptic so my first thought after reading this is that I've seen videos of some magician guy walking though a glass windows too. "Seeing is believing" doesn't apply to videos.
 

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Looks to be a safe, simple, & cheap mod. Thanks for the review. Also, I can't get enough of the BPV sound lol :LOL:
 

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So my question is; with the increased airflow, how can we be sure that particles that would get caught in other filters aren't getting through to possibly damage the engine?
 

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So my question is; with the increased airflow, how can we be sure that particles that would get caught in other filters aren't getting through to possibly damage the engine?
"4 to 6 layers of cotton gauze sandwiched between two epoxy-coated aluminum wire screens. The cotton is treated with a specially formulated grade of oil causing tackiness throughout the cotton’s microscopic strands. The nature of the cotton allows high volumes of airflow, and when combined with the tackiness of the oil creates a powerful filtering media that ensures engine protection."

I took this from K&N's website. However, virtually the same idea, in some variation, would apply here I'm assuming
 

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Exactly the reason for the question. K&N makes that statement, but with the green filter flowing air so much better, can they have the same filtering capability?
 

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Exactly the reason for the question. K&N makes that statement, but with the green filter flowing air so much better, can they have the same filtering capability?
It really doesn't flow much better than the K&N. The demonstration is calibrated so that the fan speed (and air velocity) drops significantly with only a slight increase in pressure, and the velocity differential between the ping pong ball floating up the column vs. falling to the base of the column is minimal. The pressure drop through the Green filter is one one side of that line, while the pressure drop through the K&N is on the other side. The "Wow, look how much higher in the air the ping pong ball is!" is pretty much smoke and mirrors. You could make the ball go 5x higher than that, or only 1/4" higher, depending on the size of the clear tube and the velocity of the air passing through.

Here's a decent comparison of six high-performance filters:

Performance Car Air Filter Test - Hull Motor Trader | Cars for sale Hull | Hull Car Sales

Testing six aftermarket cone filters for the 1.6L Fiesta, they found that the range of pressure drop across the six models at 6.75 m[SUP]3[/SUP]/min (238 cfm) ranged between 0.96-1.51kPa (0.14-0.22psi).

The K&N was the smallest filter they tested and rated highest of the group at 1.51kPa. The Green filter was rated at 1.37kPa. The most free-flowing was the Powertec stainless steel mesh filter at 0.96kPa.
 

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I was there. Saw the demo and ran the demo myself. I put three filters on what ever tube I wanted and the "flow" was best on the green filter.

All tubes were the same size. Fan speed was constant.

Just trying to clarify for the skeptics.

Also, the open end design of the Green Filter as seen in the Focus application is what I'd attribute the enhanced engine intake noise to.
 

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K&N doesn't filter as well as stock. Logic would suggest the green filter filters even worse. Cotton is more porous than paper. Many tests have been performed to confirm paper elements filter better. Let me tell you my stock Focus air filter has 37,500 miles on it and it still looks brand new. It must flow pretty well. Crappy clamp on air filters are dangerous. This filter setup appears to open the bottom of the air filter element to road grime, salt and water which makes it that much easier to damage your engine. My recommendation would be to go with a stock intake on an expensive cold air intake kit that includes a protective housing. Cold air intakes usually add little to no power - especially with the stock plumbing. Can you imagine the engineering that Ford went through to design the OE intake system? You think they design it to be poorly performing or hurt fuel economy? Don't waste the money.


Sorry for the negativity! I'm just speaking from experience working on all kinds of Fords at Ford dealerships for over 6 years. These filters screw up Mass airflow sensors and usually lead to unfiltered air entering the engine.
 

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K&N doesn't filter as well as stock. Logic would suggest the green filter filters even worse. Cotton is more porous than paper. Many tests have been performed to confirm paper elements filter better. Let me tell you my stock Focus air filter has 37,500 miles on it and it still looks brand new. It must flow pretty well. Crappy clamp on air filters are dangerous. This filter setup appears to open the bottom of the air filter element to road grime, salt and water which makes it that much easier to damage your engine. My recommendation would be to go with a stock intake on an expensive cold air intake kit that includes a protective housing. Cold air intakes usually add little to no power - especially with the stock plumbing. Can you imagine the engineering that Ford went through to design the OE intake system? You think they design it to be poorly performing or hurt fuel economy? Don't waste the money.


Sorry for the negativity! I'm just speaking from experience working on all kinds of Fords at Ford dealerships for over 6 years. These filters screw up Mass airflow sensors and usually lead to unfiltered air entering the engine.
Most of what Ford (and other) automotive engineers do is always a compromise... a comprise between performance and COST... a compromise between performance and NVH... a compromise between performance and packaging (which is part of cost..). They don't necessarily design things to perform poorly but they certainly don't design everything for all out, best performance either... I have some very close friends who have been in the auto engineering business for over 25 years... i know the stories....

As for the an oiled filter messing up a MAF senor... I've run plenty of oiled filters without a single issue... perhaps you've only seen the result of some one that doesn't know how to clean and re-oil their filter.... Oh, and in case you didn't know... the 2.0 EcoBoost doesn't use a MAF senor... it uses multiple MAP sensors...

Oh, and like I said... I've got 3500 miles on my ST.. the side of my air box is spotless! And I've driven it in all kind of conditions... so I'm not really worried about the side being open... probably could put a pre-filter or hydro-shield over the Green filter if the side gets to much exposure...

Finally, WELCOME to the ST Nation!
 

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Been running this type of filter in everything I own for the past 20 years and never had a problem.

Over oiling of the membrane often causes issues when owners clean and reinstall
 

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