Ram air done, complete, tested. Lots of pics (not 56k) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-20-2004, 10:24 PM   #1
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Default Ram air done, complete, tested. Lots of pics (not 56k)

I finsished my ram-air. Many of you already know the setup, but to refresh, the duct on the driver'* side feeds the CAI, and the duct on the passenger side cools the SC and throttle body. Some basic assembly photos:













Mounted on the drivers side:


Katie and I took the car out to test today (Pooky is in CA at cheerleading nationals). Did 6 runs total. First 3 were with both ducts plugged in the engine bay (outlet ends) with clean rags, and tape to hold them in against any pressure. 3 different speeds (30mph, 45mph, 60mph) recording outside air temp, IAT temp, and SC temp (taken just under the mesh at the top of the SC next to the TB). We taped this thermometer (Fluke) to the windshield so we could see it, and took IAT measurements from the Actron scantool. Ambient air temp was taken from the Climate control.

We then stopped the car to unplug the ducts. Funny, the pressure at the scoops built up to the point that it popped the air hoses off the scoops under the car. This answered the pressure/flow question for me. We got back in and ran the same test at the same speeds, recording the same temps. Keep in mind, this was after full heat saturation of the engine/trans.

Our data:

ducts plugged (no ram air)
Speed----------Air temp-----------IAT temp------------SC temp
30-----------------58--------------------92--------------------93
45-----------------59--------------------95--------------------91.6
60-----------------60--------------------90--------------------81.2

ducts unplugged (ram air flowing)
Speed----------Air temp-----------IAT temp------------SC temp
30-----------------61--------------------86--------------------81
45-----------------61--------------------72--------------------80
60-----------------61--------------------70--------------------70

As you can see, it made quite a difference. I'm basically running both ducts at 10 above ambient temps, with a 10-20 reduction in temps across the board.

We then speed-tested the mounting up to 115mph, with no problems. The sprayed on bedliner coating is tough. Not a chip or ding, but we did have dead bug guts inside the scoops, and a dead wasp in the SC cover mesh

Some testing pics:














And the finished pics:

















This was a major success as far as I'm concerned. Works great, very little cost, and looks ok. The only thing I might consider changing is the type of scoops, and adding some kind of heat extraction.
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Old 03-20-2004, 10:28 PM   #2
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Thats awesome! Great job looks very great and professional. I might play around and try something like that.
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Old 03-20-2004, 10:32 PM   #3
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very good idea and great numbers
i do have one question, why did you take the pics at a boat launch
 
Old 03-20-2004, 10:33 PM   #4
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Love the river That'* where we ended up at the end of the testing. Thought it would be a great backdrop.
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Old 03-20-2004, 10:40 PM   #5
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lol, Will, i was making a joke, the word "boat"
i have one concern though,looking at the bottom of your bumper cover, its all scratched up from bottoming out, how long do you thing the scoops will stay there. just a thought,
 
Old 03-20-2004, 11:27 PM   #6
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The old retired couple I got it from did that. I've only scraped once. I will have to park back a bit when parking up to a curb, block, or planter box. They are about 1/2" lower than the black deflector.
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Old 03-21-2004, 12:51 AM   #7
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I'll be looking for a slightly more hidden approach to it Maybe slightly further back collection, and i'm not doing it till i find what I want for scoops.

Nice work though, but maybe some sort of mesh to strain bugs out to keep the engine clean may help some? I think the velocity isn't as important as the temp of the air coming in.
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Old 03-21-2004, 02:05 AM   #8
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I wanna see the performance benefits fromt the air going to the CAI
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Old 03-21-2004, 06:56 AM   #9
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its looks neat with the scoops under the front regardless if you lowered the temps 1 degree it was a sucesss good job will we something different to work with instead of the maytag ram air set-up
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Old 03-21-2004, 11:58 AM   #10
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Quote:
Originally Posted by Bassplayincrowe
I wanna see the performance benefits fromt the air going to the CAI
Somebody posted a link somewhere awhile back that said every 5 or 10 degrees (I forget which) reduction in intake air temp results in one HP. Since I'm drawing 20 degree colder air at the filter now, AND knocking some heat off the SC and TB (more data to collect there, btw), I'm guessing I gained less than 5hp, but it'* worth it for me because of the low cost. Especially cooling that SC. With the raised redline on the Jet, and the smaller pulley on the Eaton, it'* spinning at an ungodly rate at WOT. Any cooling I can provide gives me peace of mind to go along with the 3-5 hp gain.

Shawn or Bullet, do you guys remember that post about temp vs. hp?
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