What about getting a new tube bent for between the intake and the throttle body? a muffler shop could do it...
You could take a piece of PVC and heat it to match the intake tube, and if it worked better with a larger size, have a piece of aluminum or stainless bent to replace.... just a thought.
__________________
2008 Tundra SR5 DC TRD offroad pkg. Brushed SS stepboards. Lorado Bed cover, spray-in areoliner, AFE Cold Air Intake, V3 backup camera, XM radio .
i think it would be louder without the ribbed intake tube
The intake tube itself isn't a noteworthy restriction, even with the ribs. The little box off the side serves mainly as a resonator to acoustically tune the intake sound. Toyota did their homework on this piece IMHO.
I absolutely love the sound of the intake now having the bottom opened up. So far I haven't noticed any drop in MPG and the top end power is still there, even after the ECM has adjusted itself to the better air flow. Off the line punch is getting better and better
My next step is the URD MAF calibrator and a wideband O2 setup, so I can calibrate MAF to get the open loop A/F ratios a little leaner. This thing runs pig rich on the top end!
__________________
2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
What did you use to get rid of the ribs in the air box?
A pair of right angle cutters and a dremel ( and way too much time )
__________________
2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
Looks like a fun project. Spend some some time on google searching airbox volume and filter location, you'll get an idea of what works and why.
A really trick air box comes on the Lexus IS-F, which has a 5.0L V8 pushing 417hp. The box has a huge flap on the side which opens under higher throttle/higher rpm operation... pretty much the same as cutting that big hole, but resonance and sound are kept stock for lower rpm.... neat stuff.
This link was posted once before. Its the same mod but with a little more detail. They atcually got an engine check light and came to the conclusion that more air was needed. So they cut another hole in the side of the air box and routed it through the extra hole in the fender wall.
__________________
2007 DC SR5 4x4 4.7
De Badged
All Weather Floor Mats
Painted Wheels
1 3" core 26" power stick mufflers
N-fab pre-runner light bar
Satin Black Head Light Mod
With a few hours to myself today I decided to take an extra intake I had lying around and experiment with it a bit ( see pics ). I disconnected the battery to reset the ECM with each change I made. Here's what I did in sequence and the affect it had ( butt dyno, calibrated with mom's home cooking of course )
1 - Removed carbon screen ( good improvement in throttle response and slightly better acceleration throughout the rpm band )
2 - Removed ribbing in upper intake ( a little better all around than removing carbon screen )
3 - Cut hole in bottom intake ( remarkable improvement in top end power and just the right amount of intake noise - kind of in the middle between the unmodded stock intake and an open filter style intake i.e. airaid )
If you look at the picture with the carbon screen, you can see how restrictive it is, as I was trying to shine the light of a 100w bulb through it. While it's a piece of emissions control equipment, it does negatively affect airflow IMHO. The ribbing in the upper intake is nowheres helpful in terms of aerodynamics and seems to serve a function of stiffening the plastic to keep down intake noise. Removing it was likely only serving my compulsive nature, but it did make a noticeable change in how the truck ran ( if you try this, make sure you clean up the plastic debris thoroughly before running the engine! ) For those of you who were thinking the hole I cut in the bottom lets the engine pull hot air ( and it likely will ), I didn't notice any difference in power while driving in stop and go traffic.
I temporarily switched back to my unmodded intake to see how much different the truck ran. Let me tell you, I'm extremely surprised how much improvement it made overall, especially higher rpm power and the intake note the engine now has! I'll be monitoring my fuel mileage next time I fill up to determine how all the mods affect it.
PS - I'm not responsible if you try this yourself and mess up your truck
I'm not really sure what part of this post that lead me to think that this would be a great 20 minute mod that I would just do after work and be done by dinner... I think I'm retarded some times...
Haven't cut the hole in the bottom but got the ribs dremeled and sanded down tonight. What a frickin' mess, dude I had plastic EVERYWHERE, I will do the bottom cut tomorrow. I removed that screen months ago. The wife's 04 4runner had one of these and I pulled it right when I got home.
I'll be rollin' the "thumbster" intake by tomorrow.
The box has a huge flap on the side which opens under higher throttle/higher rpm operation... pretty much the same as cutting that big hole, but resonance and sound are kept stock for lower rpm.... neat stuff.
I was thinking about the vacuum actuated door idea, but I didn't want to risk not getting the whole experiment done, so I just took the brutal approach. I guess you could take something like a vacuum advance unit from an old V8 distributor and make it work that way.
__________________
2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
Another update on the MPG figures - no loss in fuel mileage. I actually got 420 miles out of this tank (when the light came on)! This was under mixed driving with about 75% freeway miles and with some full throttle runs! Not to shabby, as long as the ECM doesn't readjust itself to bring it back down.
I'd like to hear anyone else's results from this mod if they attempt it. Thanks to everyone for the positive remarks so far and not being initially negative about the idea. This mod would have likely never happened had it not been for a generous TS member selling me his stock intake for a good price to experiment with.
Now all I need is someone's stock ECM.....
__________________
2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
Re: Stock 5.7 intake mods & experiments
)
2008 Toyota Tundra DC 2WD 5.7L V8 X-SP, Silver Sky Metallic. 
)
)
I think I'm retarded some times... 
Linear Mode
