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Discussion Starter · #1 ·
Simple 20 min mod.

We used to do this on old MK1 GTi's back in the day as "cold air intakes" didnt exist. Install a higher flow panel filter and open up the airbox some.

After looking at the OE box and washing the car a bunch, I noticed the side near the headlamp doesnt ever really get hit by water. All I was really looking for is a little more intake noise and *hopefully* a little more airflow from a point that is furthest away from the engines heat.

You can definately hear the turbo sounds now as well as some more induction noise. Haven't driven enough to determine if there were any other differences as quicker spool or more responsive throttle. But, it was FREE :)

 

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:thumbsup: I was considering doing something similar. I just want a little more induction/turbo noises to placate the 18 year old in me. Oh, and to not have to pay $300 bucks for it.
 

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:thumbsup: I was considering doing something similar. I just want a little more induction/turbo noises to placate the 18 year old in me. Oh, and to not have to pay $300 bucks for it.
Me too. fswerks sells just the open conical filter portion for the Focus ST for $60 and im hoping they do the same for the Fiesta
 

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Actually, drilling holes in the airbox isn't such a great idea if you expect a performance increase. The stock box sucks COLD air from in-front-of, along-side-of the radiator. You've just modified the box to suck in hot engine compartment air... :(

If all you're looking for is more noise, then you did right. :)
 

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Discussion Starter · #5 ·
No i didnt. Re-read it as its directly behind the headlight, the furthest point away from the radiator and engine that you could possibly get, close to the headlight and hood seam. In the same location other tuners are putting their open filters w/ no shielding. Not to mention the front intake is still in place.
 

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Don't sweat the air temp thing. These cars have a very effective intercooler for stock applications. The charge gets heated up plenty just by getting compressed and running through a hot piece of metal. And since it sits on the far side of the engine compartment those temp increases will be minimal.

Since these cars are also MAP based, if there were any increases in air flow it too would have a negligible effect on performance.
For me, it's just about being a little more fun to listen to while driving around. Ricer? Sure. Do I care? Nope. Plus...I am cheap, I drive a Ford Fiesta! :rotfl:

The pluses of this tiny mod outweigh the minuses for me. Just have fun.
 

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I literally took a different route and opened up the bottom of the air box with a hose that goes to a scoop under the front air dam. It definitely is cold down there!
 

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Discussion Starter · #9 ·
Man it IS hot in there!

Ambient temp


After a triple digit speed climb gaining 2000' elevation
over 15 miles
(Ghetto rigged thermometer next to holes behind headlight- battery was dead in my digital one)

Whopping 42'


Pretty sure the IC can handle that.
 

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Well, I must say that measured data trumps theory every day!
I'd be interested to see what that number would look like when it's 85 deg. out.
 

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Discussion Starter · #12 ·
I imagine in a traffic situation and the summer heat it does get warmer in there. Too much for the IC to compenstate for? Guess we'll have to wait and see.

Fortunately around here, I dont sit in traffic much.

I kinda guessed it wasnt getting that hot in that corner just by touch (before I used the thermometer or did the mod).

Just w/ your hand you could feel the difference between the engine side of the airbox and otherside.
 

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What you really need to test the effectiveness is a manometer.

Plumb one side in to an intact air box, then plumb the other side to where you want to get air. When you find positive pressure with no water intrusion, you're probably in the right spot.

Stagnant air and radiated heat are how you can get hot spots. If the air is moving and there is no line of sight to the exhaust, it should be ~cool.
 

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That's funny, in a lot of ways a Fiesta is built much better than an antique Ferrari.

Funny story: a vintage racer friend of a friend with a Ferrari 250 or something (old front engine V12) was accused of butchering his Ferrari when some tifosi saw a bunch of ugly welds on the chassis. The ugly spots were the only original parts left (such is the life of a race car).

I don't think they can get away with that in a carbon fiber car but if its aluminum or steel, there are probably a bunch of uglies lying beneath the skin.
 

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Ok, How the Hades do you get the bottom of the airbox out? Is that sumbitch bolted down? It looks like it's just held with rubber mounts.
I wiggled, cussed and tugged that thing and nada. It's like one of my regular Saturday nights.
 

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I wiggled, cussed and tugged that thing and nada. It's like one of my regular Saturday nights.
Bwahahaha.

But seriously though, a write up on the removal would be good. Was hoping Mountune would post their info on their intake install someday.
 

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2364-CAIS-AA-5.jpg
Ok, How the Hades do you get the bottom of the airbox out? Is that sumbitch bolted down? It looks like it's just held with rubber mounts.
I wiggled, cussed and tugged that thing and nada. It's like one of my regular Saturday nights.
Once the air box lid is off with the 4 torx screws there is only the one torx screw left that holds the airbox to the front support beam on the car once that is removed it only takes a firm hand and good tug or two to pop the bottom of the airbox out of its holders..

Here in this Mountune Pic you can see the Torx screw to the left of the YELLOW hold rod holder on the Aluminum moutnune AirBox Bottom...
 

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Discussion Starter · #19 ·
Yup, and the front snorkel holds it in place pretty well too. I think I popped out the snorkel before lifting the base.
 

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Ok, How the Hades do you get the bottom of the airbox out? Is that sumbitch bolted down? It looks like it's just held with rubber mounts.
I wiggled, cussed and tugged that thing and nada. It's like one of my regular Saturday nights.
I had no problem with it, I just pulled on it and popped out. Pop off the snorkel first, removed that little torx bastard, and then off it comes.
 
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