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Old 01-18-2013, 02:46 PM   #1 (permalink)
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Default Air Box Mod Idea?

I did the airbox mod to my car about 3000 miles ago (i only know that because I'm due for an oil change soon) I followed the directions that were on the forum and I got great results.

The other day however I had a thought that maybe removing the "tuba" in the front of the box and covering the hole with tape or whatever to block radiator heat, actually might not let you get the full performance upgrade.

So today I decided just to put the tuba back onto the box. Because to me it makes more sense to have more air going into it rather than covering up potential intakes. I could be wrong though. I'll keep you guys posted to see if it makes any difference good or bad.
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Old 01-18-2013, 03:02 PM   #2 (permalink)
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Default Air Box Mod Idea?

Don't take my word on this but I'm pretty sure that you'll just be getting hot air straight from the engine bay through that hole!

You want a nice cold stream of air into your engine for best results!


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Old 01-18-2013, 03:57 PM   #3 (permalink)
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Default Re: Air Box Mod Idea?

Yeah i know thats why they tell you to cover the hole up. But the tuba is pointed away so it shouldnt be that bad

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Old 01-24-2013, 02:22 PM   #4 (permalink)
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I wouldn't do it. Any increase in your IAT (Intake Air Temperature) is going to hurt performance. The air right by your hood can reach 200 degrees significantly affecting your IAT. I remember doing some testing on the CAI for my Ford Contour and in stop and go traffic, it would continuously go over 185 degrees. (The digital thermometers that I was using had a max of 185.) My current CAI reads almost the exact same as the outdoor air temperature. Which lately has been in the single digits.
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Old 01-24-2013, 02:36 PM   #5 (permalink)
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Default Air Box Mod Idea?

Quote:
Originally Posted by ButtonPuncher View Post
I wouldn't do it. Any increase in your IAT (Intake Air Temperature) is going to hurt performance. The air right by your hood can reach 200 degrees significantly affecting your IAT. I remember doing some testing on the CAI for my Ford Contour and in stop and go traffic, it would continuously go over 185 degrees. (The digital thermometers that I was using had a max of 185.) My current CAI reads almost the exact same as the outdoor air temperature. Which lately has been in the single digits.
+1 to that

Also, pretty sure the hole for the tuba is facing toward the front of the vehicle? It is on mines but mines is the 2.0L in the UK...


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Old 01-24-2013, 03:24 PM   #6 (permalink)
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First of all.. there really is no perceivable performance increase from any configuration of the airbox mod. It is purely about letting the sound of the engine out. Once the internal baffle is removed (as well as the resonator), I have found very little difference with or without the tuba.

Second, Covering the tuba hole will only hinder airflow.. when completely stock, the tuba is the main source of air, with the vaccume flap only opening under heavy acceleration to allow additional airflow. Removing the resonator opens up a major pathway for air.. so having no resonator and internals but covered tuba hole is probably close to stock flow.

Third, the stock tuba opening (just under a flange on the airbox cover) is actually in the path of air moving around the radiator and headlight (at least on my V6.. I poked around at it for a while).. so I wouldn't be concerned about leaving it on. Think aout it.. why would the factory place the primary air intake in the path of heated air? The airbox was designed to be restrictive mostly for keeping noise levels down (and for reliable metering)
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Old 01-25-2013, 02:58 PM   #7 (permalink)
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Quote:
Originally Posted by mmceorange View Post
Think aout it.. why would the factory place the primary air intake in the path of heated air?
The mfg does lots of idiotic things that hurt performance only for the sake of meeting emissions standards, quieting down the engine, and reducing cost. Same reason why they run hot coolant through the throttle body...emissions. Restrictive close-couple pre-cats....emissions. Intake and exhaust resonators that slow/restict air flow...for quietness. No oil cooler...reduced costs. (Yet the SVT Contour with the 2.5L Duratec and the 3.0L Mazda MPV minivan both have an oil cooler.)

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Old 01-25-2013, 04:31 PM   #8 (permalink)
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All true, but what reason would they have to direct heated air into the main intake?
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Old 01-25-2013, 07:18 PM   #9 (permalink)
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Emissions. Same reason as heating the intake air via the throttle body coolant circuit.
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Old 01-25-2013, 09:02 PM   #10 (permalink)
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Default Air Box Mod Idea?

But that makes no sense. Cool air is denser which means more air molecules per volume. More air molecules means a better & more complete burn therefore LESS emissions with cool air.


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