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Old 11-05-2005, 10:25 PM   #1
davidfarmer
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Default DIY Cold Airbox Save $$$$

I got so sick of reading about $600 airboxes, that I decided to build one from the OEM stuff. It is almost like GM designed the parts for it. Just pull the airbox off, swap the left/right filter holders (mounting them upside down of the other side), cut 2 holes in the shroud, and voila.

The air filters hang down in the top of the shroud, catching tons of cool air. My accelerometer is dead, so I coulnd't get any before/after testing, but my MAF and air inlets are DEAD COLD after a hot run, and were always quite warm before.

I actually considered buying one of the high $$ intakes, but since none of the vendors here have ever helped my racing efforts, I'd rather help myself.

I was a little rushed today, but once I get an airtight seal, I put it within 90% of any of the aftermarket kits!
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Old 11-05-2005, 10:31 PM   #2
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Interesting idea. Any thoughts of changing out the filter for a K&N now, or do you think they flow better?

Thanks for the post.
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Old 11-05-2005, 10:31 PM   #3
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I was sizeing up the exact same thing today! Go figure!! All I need is the shroud part number???
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Old 11-05-2005, 11:10 PM   #4
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Quote:
Originally Posted by davidfarmer
I got so sick of reading about $600 airboxes, that I decided to build one from the OEM stuff. It is almost like GM designed the parts for it. Just pull the airbox off, swap the left/right filter holders (mounting them upside down of the other side), cut 2 holes in the shroud, and voila.

The air filters hang down in the top of the shroud, catching tons of cool air. My accelerometer is dead, so I coulnd't get any before/after testing, but my MAF and air inlets are DEAD COLD after a hot run, and were always quite warm before.

I actually considered buying one of the high $$ intakes, but since none of the vendors here have ever helped my racing efforts, I'd rather help myself.

I was a little rushed today, but once I get an airtight seal, I put it within 90% of any of the aftermarket kits!
I built my own for my C4. I like this approach
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Old 11-05-2005, 11:31 PM   #5
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don't forget some pictures!!sounds very cool!
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Old 11-05-2005, 11:44 PM   #6
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Old 11-06-2005, 12:45 AM   #7
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Quote:
Originally Posted by davidfarmer
I got so sick of reading about $600 airboxes, that I decided to build one from the OEM stuff. It is almost like GM designed the parts for it. Just pull the airbox off, swap the left/right filter holders (mounting them upside down of the other side), cut 2 holes in the shroud, and voila.

The air filters hang down in the top of the shroud, catching tons of cool air. My accelerometer is dead, so I coulnd't get any before/after testing, but my MAF and air inlets are DEAD COLD after a hot run, and were always quite warm before.

I actually considered buying one of the high $$ intakes, but since none of the vendors here have ever helped my racing efforts, I'd rather help myself.

I was a little rushed today, but once I get an airtight seal, I put it within 90% of any of the aftermarket kits!
David,

How about a nice write up with instructions and pics? That would be very much appreciated by a lot of us.
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Old 11-06-2005, 08:34 AM   #8
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It's a work in progress, and I want to clean up my cutting before posting. Just cut of the original shroud, then buy a replacement for later. The shroud needs to be in place to cut properly, anyway.

The only real problem is deciding how you want the filter's to sit. If you drop them all the way down into the shroud, they can actually touch the condenser.

I got mine to a good, working point, and will refine it later. btw, the previous owner had already put gauze-style filters in the car, so I'm just using them.
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Old 11-06-2005, 09:16 AM   #9
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My kind of mod.
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Old 11-06-2005, 11:00 AM   #10
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Just remember that the stock filters are paper and you are exposing them to water. Paper filters and water don't mix, the paper will either expand and block airflow or worst case the paper will dissolve and allow water, paper from the filter and any foreign matter (sand, gravel, rocks, etc.) to get into the valves and cylinders.

Hydrolock +++.
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Old 11-06-2005, 01:34 PM   #11
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Sounds like this has potential. Would love to see some good photos.
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Old 11-06-2005, 08:39 PM   #12
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Like I Said in my follow up, I already had gauze filters in the car.

Here are some shots. I'll clean up my cuts, and build an aluminum shroud to seal off the outer edges. And/or, I'm thinking or trimming the area where the outer parts bolt to the primary, therefore narrowing the entire assembly slightly.

Already, it's working well, and I think with a little work, it will be great. I'm running the long course at VIR next month, and if there are any problems, that is where they would happen (nothing will).

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Thanks!

http://www.DavidFarmerRacing.com/
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Old 11-06-2005, 08:50 PM   #13
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Very cool, nice work.

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Old 11-06-2005, 09:30 PM   #14
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Thanks for the pics. Yep, this has some potential! Nice job.
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Old 11-06-2005, 10:16 PM   #15
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Can't wait to see some numbers
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Old 11-06-2005, 10:19 PM   #16
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that's pretty friggin sweet!!Good job!Now,what filters will you be using,or will you be keeping the stock ones??Are you worried about water coming up from under??Oh,and what you're doing is flipping the unit (filters)upside down?
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Old 11-06-2005, 10:47 PM   #17
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What year is that filter mod for?
Didnt look like my filter (06)
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Old 11-07-2005, 01:34 AM   #18
Andre23
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This seems like a nice mod.

A few questions...

1) Any idea what the shroud part number is?
2) What kind of perfomance gains can we look forward to with this cutting procedure?
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Old 11-07-2005, 09:39 AM   #19
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Good job.
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Old 11-07-2005, 12:49 PM   #20
davidfarmer
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If I were buying the filters, I would buy GREEN filters. They are excellent quality, using SS mesh, and often have less of the rubbery stuff around the edges, basically giving more exposed surface area (both via more area and more pleats).
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Old 11-07-2005, 12:49 PM
 
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