ST200 airbox vs stock box

[mkokoszka]

Is there a gauge on my Cobb AP that measures how much air is getting to the intake or engine? Curious to see what the quantifiable difference would be between my stock airbox and the ST200. Thanks.

 

[TyphoonFiST]

Is there a gauge on my Cobb AP that measures how much air is getting to the intake or engine? Curious to see what the quantifiable difference would be between my stock airbox and the ST200. Thanks.

Nope* You would need an anemometer. The only thing Ap3 does is intake air temp I do believe. The St200 is essentially the same boxbplus the air inlet hose from the bottom that you can route to a fresh cold air area of your choice.

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[Dpro]

Nope* You would need an anemometer. The only thing Ap3 does is intake air temp I do believe. The St200 is essentially the same box minus the air inlet hose from the bottom that you can route to a fresh cold air area of your choice.

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I think you meant plus. Or you meant to say the stock box is the same as the ST200 minus the air inlet hose from the bottom.

 

[TyphoonFiST]

I think you meant plus. Or you meant to say the stock box is the same as the ST200 minus the air inlet hose from the bottom.

I was at work for a Double* I was most likely on Autopilot! But unlike Tesla I didn't CRASH*....Hehe

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[Capri to ST]

Is there a gauge on my Cobb AP that measures how much air is getting to the intake or engine? Curious to see what the quantifiable difference would be between my stock airbox and the ST200. Thanks.

The Mountune airbox is exactly the same functionally as the ST200 airbox, it's just made out of aluminum instead of plastic. This is a quote from the Mountune website regarding their airbox, where they claim that it provides a 21% increase in air flow over the stock one-

"The mountune Fiesta ST Induction Upgrade includes a uniquely constructed aluminum air box with a secondary cold air feed point. Additionally, the air box has been engineered with features that reduce the delta pressure drop by 2kPa that when coupled with the included mountune high flow air filter, provide a 21% increase in airflow."
https://www.mountuneusa.com/Induction-Upgrade-Kit-Fiesta-St-2014-18-p/2364-cais-aa.htm

 

[4DGC]

If you get the Mountune or the ST200 box you will draw air from 2 locations. One is the stock location, the plenum above the radiator which is good for keeping things quite but obviously compromised because it is heated by having the radiator right below it. The 2nd location is down by the fog light which is clearly better. Both locations will combine in the airbox for a slightly warmer than ambient temperature air mix heading to the turbo. This clearly better than stock USDM. The turbo will be sucking this air in just like sucking a milkshake through a straw.

If you keep the stock USDM airbox and add a Big Mouth, the air is coming from in front of the radiator and is not heated by it, thus giving you a cooler charge of air. When you are moving, that cooler air will also lightly pressurize the airbox and the tube all the way to the turbo inlet. Instead of the turbo sucking to get air, the air will be trying to get into turbo on it's own. This may or may not help make any power but what it does do, is spool the turbo sooner thus increasing throttle response. Imagine the milkshake is now being pushed through the straw. That is less work for the person/turbo doing the sucking.

Now if you add the Big Mouth to the ST200/Mountune intake you have 2 locations receiving ambient air. The restriction is less and the air is cooler than in example 1 but you do not get the positive pressure advantage from example 2.

Taking all this into consideration my choice is Big Mouth with stock airbox. I do feel like the throttle response improved and the car feels peppier getting on on-ramps or just passing someone on the freeway.

As an alternative, one could take a ST200/Mountune/DIY add a hose down to your fog light location and install it so outside air would forced into the tube. Then block the stock inlet location inside the airbox (even with duct tape) and it would provide a similar pressurized effect as the Big Mouth with stock airbox. This would be very cheap for you budget minded folks but I think the Big Mouth is a shorter path with less pressure loss.

FYI, I don't work for Velossa Tech, Mountune or any other car related organization. This just my opinion.

 

[anticon]

I agree with 4DGC. Some other considerations; rain/road spray water through the big mouth, big mouth slightly blocks radiator for cooling.

 

[TyphoonFiST]

I agree with 4DGC. Some other considerations; rain/road spray water through the big mouth, big mouth slightly blocks radiator for cooling.

No one needs to worry about water coming through and harming anything at all. I Run both the Big mouth and ST200 airbox with an ITG filter on a Gen2 GTX through all 4 seasons. No issues whatsoever....just an FYI for any of you on the fence about purchasing either option or Both. Yes..... Yes I have Hit 9k post as I see this now! Yay ME!

 

[M-Sport fan]

I agree with 4DGC. Some other considerations; rain/road spray water through the big mouth, big mouth slightly blocks radiator for cooling.

Also, if you must drive through HEAVY, hanging in the air type dust (like I do when working ARA rallies), the Big Mouth gives a much more direct path for it to clog up the filter than a factory box alone, or the ST200/Mountune if you don't route the hose to the foglight external opening.

(WHY I will not install one, even besides the radiator blockage.)

 

[Ranbo]

I had a 2" hole at the bottom of the USDM airbox before I could get my hands on a ST200 airbox. Here's a photo comparison. Beyond that it wasn't worth the trouble for me to mod the stock air box than what the ST200 air box provided.

I'll

I had a 2" hole at the bottom of the USDM airbox before I could get my hands on a ST200 airbox. Here's a photo comparison. Beyond that it wasn't worth the trouble for me to mod the stock air box than what the ST200 air box provided.

So which one is stock and which is the st 200

 

[XR650R]

I'll

So which one is stock and which is the st 200

The one on the right is the ST 200. The hole at the bottom is for attaching a hose that draws air from behind the fog light, making it a real CAI. The hose is porous, so if you drive through deep water, it won't suck it into the engine. It will just draw more air from the front inlet instead.
I'm no rally racer, but it's a practical and well thought-out CAI design for real world driving.

 

[Ranbo]

The one on the right is the ST 200. The hole at the bottom is for attaching a hose that draws air from behind the fog light, making it a real CAI. The hose is porous, so if you drive through deep water, it won't suck it into the engine. It will just draw more air from the front inlet instead.
I'm no rally racer, but it's a practical and well thought-out CAI design for real world driving.

So were is the air box were the filter goes or do you use the stock one and what is this big mouth thing I am reading about this st200 is better than a cold air intake like k@n or Cobb thanks

 

[Capri to ST]

So were is the air box were the filter goes or do you use the stock one and what is this big mouth thing I am reading about this st200 is better than a cold air intake like k@n or Cobb thanks

On the ST200/Mountune intake you use the stock top air box. The air filter goes in the new lower air box, and the space for it is the same size as the stock one. This means you can either use an aftermarket drop in panel filter, or the OEM paper pleated filter.
I'm pretty sure this is how it works.

 

[M-Sport fan]

^^^With the ST200 box, they also give you a new, factory top, and even a new OEM paper filter as well.

You do not need to either have already, or re-use the original factory top/lid if you do not want to do so, unlike the Mountune, where you must re-use the factory box lid/top.

 

[Capri to ST]

^^^With the ST200 box, they also give you a new, factory top, and even a new OEM paper filter as well.

You do not need to either have already, or re-use the original factory top/lid if you do not want to do so, unlike the Mountune, where you must re-use the factory box lid/top.

Thanks, that's good to know. I have the Mountune intake which came with my MP215 tune so that's the one that I'm familiar with.

 

[Ranbo]

Thanks, that's good to know. I have the Mountune intake which came with my MP215 tune so that's the one that I'm familiar with.

so the st 200 will give you thefkltet

Thanks, that's good to know. I have the Mountune intake which came with my MP215 tune so that's the one that I'm familiar with.

So the st200 gives you the filter box some other black box and that long black hose plus the air filter for 300 dollars

 

[M-Sport fan]

So the st200 gives you the filter box some other black box and that long black hose plus the air filter for 300 dollars

It gives you a complete air box (top portion and bottom part) with a new Motorcraft paper filter, and yes the inside water permeable accordion flex hose to duct the cool air into the box from your choice of locations.

There is no other black box involved, and sadly, they used to be <$230.00 back when I bought mine from whoosh.

 

[Downsy]

So were is the air box were the filter goes or do you use the stock one and what is this big mouth thing I am reading about this st200 is better than a cold air intake like k@n or Cobb thanks

Almost anything is better than a K&N if you are actually wanting to filter the air.

 

[Ranbo]

Almost anything is better than a K&N if you are actually wanting to filter the air.

So what is a good brand had the k n took it out put stock back in don't see much difference

 

[Downsy]

So what is a good brand had the k n took it out put stock back in don't see much difference

Unless you're running a bunch of mods or big turbo, the stock filter works fine. My suggestion is to stick with the factory motorcraft filter or an equivalent paper filter from whatever brand you want. But the oiled gauze filters are garbage at actually stopping dirt. The fact you "don't see much difference" tells you everything you need to know. K&N is a marketing company.