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Old 12-26-2018, 04:34 PM   #31
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The vent is a good idea, might work well. Only downfall is rain straight down the intake onto the filter. But might work better with forcing air in and causing turbulence. And no I did not close off the other side of the air box. I did try it today tho, didn't change the effect. I would try to remove the hood scoop to see if the air being forced in is actually messing with air going thru the MAF but its sealed to the hood. It wouldn't go back on
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Old 12-26-2018, 04:58 PM   #32
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Tac_Sub_Pressure,

The ram-air idea is pretty cool so let's not throw out the baby with the bathwater. Looking at your photos of the setup, the air inlet is at the fat part of the filter. You're right that there is not much room to install slats or louvers. But, what do you think about shortening the tube that connects to the airbox? If the tube is shortened a little bit so that there is a gap, I think you would get most of the benefit of a strong flow of cold air (when the car is moving, lol) without so much turbulence. Don't make any modification yet but let's all (attn: FFers!) mull this over some more. The goal is to get that fresh cold air into the airbox without disturbing the airflow past the MAF.

The placement of the MAF is pretty critical. Most flowmeters should have 5 to 10 pipe diameters upstream and 3 to 5 pipe diameters downstream. This is not the case on our Foci but, presumably, Ford did some modeling and hardware testing to sort out MAF placement so the signal is stable. I would leave the MAF where it is and work on the air box.

edit
Hey, looking at Post #11, the opening is quite generous. How about a flat bar or a piece of angle (like this: /\ above the filter) to deflect the air so flows to the side and does not jet into the filter.

The 6" diameter opening gives 28.3 in2 of area for flow. A 1" wide by 6" long flat bar would reduce the open area to 22.3 in2, equivalent to 5.3" diameter.

end of edit

HTH,

Chris

Last edited by nyuk98gt; 12-26-2018 at 05:10 PM.
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Old 12-26-2018, 08:10 PM   #33
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Chris,

Yes I could easily slide something into the tube to disrupt the air flow. The tube is 6" dia as you know it's also 3.75" in length. That's from top of airbox to hood, where I put a .75" rubber seal to seal it to the hood. Works awesome, no leaks. But all air that comes into the scoop is getting forced into the air box, none escapes or diffused before the filter. I have tried without the lid and tube and still get the surging. Not as hard, so diffusing the incoming air may work as we are thinking. I don't need the air rammed into the filter, there's no turbo so it doesn't need that. I just wanted an actual cold air intake. These are the downsides to doing stuff people haven't done yet. Figuring out the problems that come with it. But in total cost me $20 for the scoop, seal, pipe, and glue. So really the only thing I'll lose from all this is the 6" hole in my hood lol
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Old 12-26-2018, 09:19 PM   #34
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Now for the scoop, does it have any pieces that will stop the rain from coming in. Hard to describe but something to direct the air up and over while the heavier rain is kept out of the scoop?

Fluid dynamics have allot to do with this. Just as water flows in the pipes, so does Air. We just need to limit the air ingested all at once. You could see if you can get the air to flow in a smooth "S" pattern down to the filter. Just by putting some pieces that take up half the tube evenly spaced might help by slowing down the full rush of air straight down to the filter. You could also try this; fabricate a screen over the hood scoops entrance to help disrupt the full ingestion of all the air.
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Old 12-26-2018, 09:51 PM   #35
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Thumbs up Little of Topic

I'm not wanting to disrupt anything regarding this thread

I'm very interested in it, as I'm taking a similar approach, but using a different type of scoop and filter system. Here is what I've got planned:

https://www.amazon.com/Carbon-Fiber-.../dp/B0722NVW88

https://www.airaid.com/search/product.aspx?prod=453-181

Not as complex, but not as ingenious as what Tac_Sub_Pressure came up with. Plus with way less money. My hats off to you on your build. I hope we can all get your system figured out.
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Old 12-27-2018, 08:28 AM   #36
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The scoop doesn't have anything to stop rain going in. Not too worried about rain tho, I can try to block portions of the hole with tape from underneath to see if the disruption effects the air flow into the MAF. It's all good ideas and from here just gonna be trial and error. I'll keep ya updated with results. I would be amazed if it's something as simple as a piece of tape across the center of the tube 😂
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Old 12-27-2018, 08:32 AM   #37
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Colossus,

The reverse scoop would look pretty sweet. I like how instead of sticking up it sinks into the hood. Pending on your car color the carbon fiber look would look awesome! I appreciate the props for my intake, but I can't take credit until it works haha
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Old 12-31-2018, 09:26 PM   #38
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Quote:
Originally Posted by Tac_Sub_Pressure View Post
I changed my air filter the other day with the green filter 7159. It idles fine, however at constant speed there seems to be an almost tugging feeling on the car, the rpm seems to fluctuate up and down + and - 200rpm. I thought it was weird, put the old stock filter back on, no problem, ran perfect. I checked one more thing and removed the filter completely, did another test and the sensation and rpm revving was much worse. It seems to be the car doesn't enjoy unrestricted air flow. Any ideas on what would cause this? Never heard anyone have a problem from simply changing the air filter, cheers.
You need a tune bro. Just a few weeks ago my dad installed a intake on his mustang, and it was bogging so badly it almost died 4 times on the road. Once he tuned it with the maps American muscle sent him, it fixed his problems, and now its running better than ever.
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Old 12-31-2018, 09:58 PM   #39
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Old 01-02-2019, 07:18 AM   #40
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The tune is a good idea, but still doesn't explain why a stock filter works great but a Green Filter doesn't work.
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