Best way to get better airflow using stock airbox & K&N panel?

[1MEAN18]

I'm tuned, E30, with an upgraded FMIC (brand doesn't matter). The stock airbox, I'm told, doesn't need changed for stock turbo E30 power levels. And I don't want any turbo noises, I like being quiet and stealthy. What can I do to get better airflow, keeping the stock box, that gives me real gains. I'm asking because this car doesn't seem to recover from IAT heat soak very well, and I can't help but wonder if its a bit restricted still. I had the noseclip off to install the FMIC, didn't modify anything else at that time. Anybody do anything like drilling a few large holes in the bottom of the airbox or any other cheap, easy to do mods that ended up helping? Any advice, especially free to do stuff, would be greatly appreciated!

 

[Ford ST]

ST200 airbox it's a Ford part that's always going to be my recommendation.

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[CanadianGuy]

Open a hole at the bottom of the stock air box to actually get air from the bottom )a few thread are on this topic). Mimics the st200 box and the Mountune air box without the expense . Add a vellosa tech big mouth to funnel more air into the box at speeds. Heat wrap to prevent engine heat from heating intake.

Now there is a resonator on the charge pipe that is somewhat restrictive that can be removed (not seen from the top) but at that point might as well replace all the induction hoses as each will be just a little improvement but all done does somewhat add up. However you will get more turbo spool sound.

 

[1MEAN18]

Open a hole at the bottom of the stock air box to actually get air from the bottom )a few thread are on this topic). Mimics the st200 box and the Mountune air box without the expense . Add a vellosa tech big mouth to funnel more air into the box at speeds. Heat wrap to prevent engine heat from heating intake.

Now there is a resonator on the charge pipe that is somewhat restrictive that can be removed (not seen from the top) but at that point might as well replace all the induction hoses as each will be just a little improvement but all done does somewhat add up. However you will get more turbo spool sound.

Open a hole at the bottom of the stock air box to actually get air from the bottom )a few thread are on this topic). Mimics the st200 box and the Mountune air box without the expense . Add a vellosa tech big mouth to funnel more air into the box at speeds. Heat wrap to prevent engine heat from heating intake.

Now there is a resonator on the charge pipe that is somewhat restrictive that can be removed (not seen from the top) but at that point might as well replace all the induction hoses as each will be just a little improvement but all done does somewhat add up. However you will get more turbo spool sound.

Thanks for the quick reply! I like where you are going, DIY stuff to save money is my game too. I've searched but haven't found stock box mod, but I still think I catch the drift and can do it easily without instruction. As of now, VT can't confirm the Big Mouth actually fits an '18, they asked me to drop by to see for sure, but I live in Ohio so that isn't happening. LOL. Do you know of any '18's that actually has a Big Mouth? If so, it appears to be worth buying. Also, you mention charge pipe restriction, a resonator on it, you are talking about the cold side? Because I don't remember, when I was under the car last time, any resonator on the cold side piping.

 

[Mikey456]

Open a hole at the bottom of the stock air box to actually get air from the bottom )a few thread are on this topic). Mimics the st200 box and the Mountune air box without the expense . Add a vellosa tech big mouth to funnel more air into the box at speeds. Heat wrap to prevent engine heat from heating intake.

Now there is a resonator on the charge pipe that is somewhat restrictive that can be removed (not seen from the top) but at that point might as well replace all the induction hoses as each will be just a little improvement but all done does somewhat add up. However you will get more turbo spool sound.

I already opened up the bottom of my air box. My next step is a hi flow filter and mTune. Hopefully, that’s enough air volume because I want the car to look visually stock. I’m not ready to drop $250 for the st200 yet...lol

 

[RubenZZZ]

I pulled out my stock airbox this past weekend and noticed a few good spots to take a hole saw and make a DIY ST200 airbox.

I need to source a 3" flex tube to attach to the airbox.

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[Clint Beastwood]

I pulled out my stock airbox this past weekend and noticed a few good spots to take a hole saw and make a DIY ST200 airbox.

I need to source a 3" flex tube to attach to the airbox.

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What I used to do, back in the day, was go find some press-in plugs at home depot, etc. in whatever sized I wanted holes. I can drill the holes with a hole saw, then if I change my mind I can pop the press-in plugs into the hole. I tended to go get the plugs *before* drilling the holes because if I did it after I could never find the right size

 

[Mikey456]

As I remember when I cut the hole it was 2.5 inches or 2.25 but i was a little off and mucked it up a little. If I did it again I would start with a smaller hole and file how much I wanted off.


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[1MEAN18]

What I used to do, back in the day, was go find some press-in plugs at home depot, etc. in whatever sized I wanted holes. I can drill the holes with a hole saw, then if I change my mind I can pop the press-in plugs into the hole. I tended to go get the plugs *before* drilling the holes because if I did it after I could never find the right size

Dude the sarcasm in your signature really made my damn day! With less than 1k miles on my FiST I was already picking up many rock chips, and I hear ya on the orange peel and poor paint. I swear sometimes a really strong gust of air makes paint chips fly off mine now. But I guess if I drove some fancier European car (insert your preference here) I'd have expected more from the paintjob or interior comfort. I bought mine to have a fun, go kart like ride but also a totally cheap to own DD. Simple as that eh?

 

[RubenZZZ]

Im gonna order this duct hose and drill a hole in the factory airbox. I'll seal it with silicone.

https://www.amazon.com/Spectre-Perf...s=flex+3+duct&qid=1559155335&s=gateway&sr=8-3

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[mindmaster]

Im gonna order this duct hose and drill a hole in the factory airbox. I'll seal it with silicone.

https://www.amazon.com/Spectre-Perf...s=flex+3+duct&qid=1559155335&s=gateway&sr=8-3

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Do a DIY Tutorial. Could be useful!

 

[CanadianGuy]

Im gonna order this duct hose and drill a hole in the factory airbox. I'll seal it with silicone.

https://www.amazon.com/Spectre-Perf...s=flex+3+duct&qid=1559155335&s=gateway&sr=8-3

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Here is the thread I remember that can be adapted. https://www.fiestastforum.com/threads/high-pressure-intake.10451/

 

[jmrtsus]

Make sure to use a water permeable hose if you put it low for cold air intake. Something like the Mountune MP215 cold air box uses.

 

[LastMK7]

Thanks for the quick reply! I like where you are going, DIY stuff to save money is my game too. I've searched but haven't found stock box mod, but I still think I catch the drift and can do it easily without instruction. As of now, VT can't confirm the Big Mouth actually fits an '18, they asked me to drop by to see for sure, but I live in Ohio so that isn't happening. LOL. Do you know of any '18's that actually has a Big Mouth? If so, it appears to be worth buying. Also, you mention charge pipe restriction, a resonator on it, you are talking about the cold side? Because I don't remember, when I was under the car last time, any resonator on the cold side piping.

I have a ‘19 win a Big Mouth. It will fit just fine on yours.