DIY - Air Box Mod - Page 13

*UltraBoater@mac.com* · 01-11-2007, 12:11 AM

After I did this mod a lil while back, I still dont have $ to buy a intake however when I did my 2 Degree Advance timing the Tech showed me that the airflow did increase... He asked what I did, I just told him about this modd, he was impressed how such a lil slice of the snorkel, spread the air pattern would actually increase the flow. Haha so it def. does something, but you wont ever notice it im sure, but you will hear a hearty groan unless you have loud *** exhaust like me haha then everything groanin... k that sounded wierd but you get the picture haha.

*UltraBoater@mac.com* · 01-11-2007, 12:15 AM

Thanks for the modd dude!

RB's Titan · 01-11-2007, 08:57 AM

Quote:

Originally Posted by UltraBoater@mac.com

Thanks for the modd dude!

On the cheap you can add a FRAM AIR HOG filter. It too increases the Air flow by 5+ gm/s. I know an armada stock with this setup and he put down 290 with an UpRev tune.

sudden urge · 01-11-2007, 09:11 AM

K&N and the Fram Air Hog are both oiled. If you want a dry high-flow, get the Amsoil Eaa104.

**HudsonValleyTitan** · 01-13-2007, 06:55 PM

Please please please someone explain to me how they think this mod does anything but "tune" or change the tone of the intake air? (Bose' wave radio has already done this!) A 2" opening, be it 2 inches long or 5 inches long, still allows the exact same amout of air into the airbox. Other than maybe making it sound faster, I don't see it changing anything.

sudden urge · 01-13-2007, 08:01 PM

Quote:

Originally Posted by HudsonValleyTitan

Please please please someone explain to me how they think this mod does anything but "tune" or change the tone of the intake air? (Bose' wave radio has already done this!) A 2" opening, be it 2 inches long or 5 inches long, still allows the exact same amout of air into the airbox. Other than maybe making it sound faster, I don't see it changing anything.

The mod allows the flow of air to be dispersed across a much larger filtering area. I and others have posted pics on that after running for 5 months with and without the mod. By dispersing the air over a greater area of the filter, especially as the filter gets clogged over time, that should allow more air if the engine actually wants more. I'm convinced, with the mod and a Performance drop-in, flow is increased. The picture below is before and after, both filters were in for 5 months.

**HudsonValleyTitan** · 01-13-2007, 09:12 PM

Quote:

Originally Posted by sudden urge

The mod allows the flow of air to be dispersed across a much larger filtering area. I and others have posted pics on that after running for 5 months with and without the mod. By dispersing the air over a greater area of the filter, especially as the filter gets clogged over time, that should allow more air if the engine actually wants more. I'm convinced, with the mod and a Performance drop-in, flow is increased. The picture below is before and after, both filters were in for 5 months.

What's happening is instead of the intake air being concentrated to one small area of the filter by that tube and then being dispersed, it's dispersed as soon as it enters the airbox which yes....will now use more of the filter area because of where the air now enters but....a 2 inch opening is still a 2 inch opening. No more volume can enter than before. You're changing how it enters, not the amout that enters.

sudden urge · 01-13-2007, 09:19 PM

Quote:

Originally Posted by HudsonValleyTitan

What's happening is instead of the intake air being concentrated to one small area of the filter by that tube and then being dispersed, it's dispersed as soon as it enters the airbox which yes....will now use more of the filter area because of where the air now enters but....a 2 inch opening is still a 2 inch opening. No more volume can enter than before. You're changing how it enters, not the amout that enters.

That's correct, but most of the incoming air gets jammed into the right hand corner of the filter, thus restricting the flow through the filter. Fill 2 tubs with water, one with a 2" drain and the other with a 4" drain. Which one will drain faster?

OMNIHUGE · 01-14-2007, 02:13 AM

OOOOOOOOOOOOOOOOOO BURNNNNNNNNNNNNNNN

Who cares the sound is cool! and it's free!

**HudsonValleyTitan** · 01-15-2007, 09:11 PM

Quote:

Originally Posted by sudden urge

That's correct, but most of the incoming air gets jammed into the right hand corner of the filter, thus restricting the flow through the filter. Fill 2 tubs with water, one with a 2" drain and the other with a 4" drain. Which one will drain faster?

Volume is volume is volume though. Where it enters is meaningless. The fact that the incoming air deposites dirt in a concentrated area doesn't mean anything is restricted. Air volume is still flowing through the entire surface of the filter. The entire airbox is full of air and is passing through the filter. The mod doesn't/can't change volume which is what's needed.
In your analogy above, if you're asking if one tub had a 2" LONG drain and the other had a 4" LONG drain (as opposed to 2" and 4" diameter drain), they would both drain the same volume of water because if you didn't change the size of the actual opening, you've changed nothing. The longer inner tube does nothing but deaden sound by stopping the buffeting air as it enters.

**HudsonValleyTitan** · 01-15-2007, 09:12 PM

Quote:

Originally Posted by OMNIHUGE

OOOOOOOOOOOOOOOOOO BURNNNNNNNNNNNNNNN

Who cares the sound is cool! and it's free!

Oh yes. Agreed! The growl you may get is pretty cool.

sudden urge · 01-15-2007, 09:41 PM

Quote:

Originally Posted by HudsonValleyTitan

Volume is volume is volume though. Where it enters is meaningless. The fact that the incoming air deposites dirt in a concentrated area doesn't mean anything is restricted. Air volume is still flowing through the entire surface of the filter. The entire airbox is full of air and is passing through the filter. The mod doesn't/can't change volume which is what's needed.
In your analogy above, if you're asking if one tub had a 2" LONG drain and the other had a 4" LONG drain (as opposed to 2" and 4" diameter drain), they would both drain the same volume of water because if you didn't change the size of the actual opening, you've changed nothing. The longer inner tube does nothing but deaden sound by stopping the buffeting air as it enters.

It's always nice to have a good conversation. Let's assume the opening is more than adequate to allow the motor all the air it ever needs, so the only question here is the angle of the air velocity entering the filter. It seems to make more sense if the air velocity reaches the center of the filter as quickly as possible and isn't delayed by being diverted to one corner. Many members noted a quicker throttle response, as did I, immediately after the mod. Call it wishful thinking if you like, but there is something to it.

OMNIHUGE · 01-15-2007, 11:22 PM

Ok Ok I'm drunk and it's late, but here's the deal. Sure without the mod air goes through a smaller opening. Ok so that smaller opening gets clogged with dirt causing air restriction.....this causes a .....restriction!!!!!!!!!!!!!!!!!!!
unclogging, thus removing the air filter clog opens up this restriction....to not a restriction......thus more air flow???!!!!

I suck at physics, and I'm drunk, but this makes sense. Anyway if you're too cheap for a CAI do this mod, because it sounds cool and may help! Otherwise ......don't worry about it....

I like mine and I'm glad I did it, and yes I did notice better throttle response no matter what physics questions you pose.

SirStrider · 01-16-2007, 03:46 AM

IMHO (and this has been bounced around on other threads / sites), the length of the 2" pipe would also affect the pressure drop, and doing the mod shortens the effective length.

Damn, shailey, we just gotta do a bofore / after test on this once and for all. I think all those that don't think it does something could pay for dyno if it does, and those that think it does pay if it doesn't. would have to set some threshhold. someone said somewhere they had a stock tube they would donate to the test. I'm almost considering coming down your way on my way back to MO...

**HudsonValleyTitan** · 01-16-2007, 05:14 PM

Quote:

Originally Posted by sudden urge

It's always nice to have a good conversation. Let's assume the opening is more than adequate to allow the motor all the air it ever needs, so the only question here is the angle of the air velocity entering the filter. It seems to make more sense if the air velocity reaches the center of the filter as quickly as possible and isn't delayed by being diverted to one corner. Many members noted a quicker throttle response, as did I, immediately after the mod. Call it wishful thinking if you like, but there is something to it.

LOL..Of course! I love a good conversation. I can't say why people are feeling a difference after the mod. Perhaps it is just a head game thing due to the sound...who really knows. I'd never try and talk anyone out of doing it because it certainly won't hurt anything.
The only way I see the stock tube causing any kind of restriction would be if the outlet was pressed right up against the air filter....but it's not. The air may not be able to go straight through now that there's a build up on that area of the filter but it's a volume thing, it doesn't have to. The air going through the entire surface of the filter if constantly being replenished through that intake tube. If the intake tube from the airbox to the engines intake (throttle body) was say.....a 3" opening and the airbox' intake tube was only 2", then making the opening larger to match the 3" intake would make sense.