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Discussion Starter #1
Finished modify my air intake thanks to the help of other member posts on this site. The MAF sensor really hinders extreme modifications to the stock system. My goal was just to keep it clean with minimal intrusiveness. Also wanted to be able to put back the stock air flow if needed. So no cuts to the stock setup. A K&N air filter is in the airbox. Looks good. Sounds even better. Pics below.

The next step is to fabricate a "cold air" duct that will pipe into the airbox for a ram air effect. Still studying my options on that one.

AI_1.jpg
AI_2.jpg
AI_3.jpg
 

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Discussion Starter #3
I used some 3" PVC tubing I bought at Lowes for about $5. That's an adjustable 3" coupler also bought at Lowes for $4. 1 foot of 1/2 ID rubber hose was used for the breather hose. Used a 1/2" barb pipe fitting that I drilled into the PVC tubing. Painted the PVC, applied a decal, and overlayed some black flexible tubing over the rubber hose for aesthetics. The K&N E1009 filter was purchased at AAS for about $37 (on sale). That's about it..

Crunching the numbers tonight on ScanXL with my bluetooth OBD2 reader, I noticed some significant differences with the installation of my airbox.

First, with the stock airbox in place, the lowest air intake temp I charted was 100*F. This was when I was maintaining a speed of about 65mph. The highest was about 155*F when I idled for about 5 minutes at normal operating temp. The ambient temp at the time of this study was about 89*F with very high humidity.

After the first run, I removed the airbox and secured the filter in place with some duct tape. I did not use any shielding next to filter. On the road I went for my second run. My results were as follows. 89*F on the low end cruising around 65MPH. And 180*F while idling for about 5 minutes at operating temp.

What I can deduct from the results is that the airbox definitely hampers airflow. At best, intake temps were about 10 degrees warmer when the airbox was on. But when idling for a prolonged amount of time, the inherent shielding on the airbox worked against engine heat.

On the flip side, having the airbox removed produced cooler air at cruising speed. But stationary, the air intake temps got ridiculously high. The AIT dropped much quicker upon acceleration when the airbox was off. However, it also rose quicker when coming to a stop.

It's obvious that shielding does work. My next mod would have to incorporate some type of shielding with an external air flow.
 

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2005 buick rainier
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7 Posts
How did you attach the barb fitting and what exactly did use to cap the hole in intake tube right after filter?
 

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Discussion Starter #5
It's a rubber plumbers pipe cap that Lowes sells. I think 2 1/4 inches was the diameter. It's referenced in the Air Induction forum for the I6 engine. Do a search and you'll find many threads. (FYI, I originally posted this thread in the wrong forum section).
 

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Was the intake a lot louder with the resonated gone like very noticeable?
Not much louder....from inside the well-insulated cabin of the Rainier. It changes the lifeless drone on acceleration to more of a soft, pleasant rumble. Some claim it sounds "badass". I wouldn't say that...but definitely an improvement.
 

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2006 chevy trailblazer_ls
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198 Posts
First of all great job on your intake, plan on doing this to my tb very soon along with adding a green air filter (very little heard of but very good). Only thing I might do is add a breather filter instead of a tube connecting back to the pvc pipe. But anyways back to what I was going to say, couldn't you based on your readings of heat shields working, but it restricts flow, cut the airbox with a dremel only leaving an L-shape on the right and top sides much like a K&N? Just my two cents, maybe ill be the guinea pig on this one but I don't have a way to read air temps that are coming in lol.
 

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2006 chevy trailblazer_ls
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This is also another idea I considered, have you had any troubles with water or anything like that?
And also if you guys did, howd you go about removing the intake resonator?
 

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2006 chevy
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No problems with water with this setup. I think HardTrailz did the same thing. If it works for him with the off-roading he does, you'll be fine.
 

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2006 chevy trailblazer_ls
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Okay, and also a question for the OP, this wont be real technical but the hole that is left when you take off the vortec 4200 box, its real small on the left side of it, what did you do with that, did you put a filter on it or did you connect it to something? If anyone else knows they can also chime in!
 

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2006 chevy trailblazer_ls
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Actually just kidding i feel like an idiot i just looked at the pictures again, but for the barb pipe fitting did you use something like this? and also, is the intake resonator the vortec box? and one more question the breather tube where you stick it into the engine, how did you do that or what hardware did you need, i found the part so i can put it in the pvc pipe i just need to know how to put the breather hose into the engine side. Plan on doing this mod tomorrow, any respose would be great if not ill just figure it out and post pics!
 
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