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  #25  
Old 08-05-2011, 07:37 PM
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Re: Intake air temperature

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Originally Posted by elvisisdead View Post
......So, there are parts of the intake that get above what the IAT sensor ever measures.
Didn't need a mensuration device for that conclusion. The physical arrangement of the devices and air flow determine final intake air temperature.

My IAT sensor is located just after the intake air filter box, at the start of the air silencer cross-box. After that, there is the throttle body and intake manifold. These components are absobing heat by conduction from the engine, while the cross-box absorbs heat by convection from the radiator discharge air. After the IAT sensor registers the air temperature, sensible heat is added to the combustion air in its tortuous trip to the cylinders.

If that is your concern, my recommendation is that you relocate the IAT sensor closer to the cylinder, say near the MAP sensor. That approach means that the sensed temperature is closest to that entering the intake valves.

Still believe that a dyno run comparison of the 2 configurations (stock vs CAI) will tell the tale. Imagine that the gains will be relatively small and at the upper end of the rpm range, above the top of the torque curve.

Here's my HEMI curves for reference:


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  #26  
Old 08-07-2011, 12:09 PM
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Re: Intake air temperature

Well, except that I'm not trying to prove that the CAI makes any more horsepower. All I'm looking at is whether or not the bwoody intake raises the temp of the air coming in the intake because it's drawing engine bay air or that the intake is metal vs. plastic.

Unfortunately, the only way I can do that is by IAT sensor reported temps.

I'm a driveway scientist. I'm not a tuner, mechanic, performance engine builder or anything of the like.

I installed it yesterday, so I'll get a few runs of measurements this week.

However, the IAT sensor in the OEM configuration is located after the corrugated connecting tube. So, the tube itself got hotter than the the air passing through it.
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  #27  
Old 08-07-2011, 12:13 PM
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Re: Intake air temperature

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Originally Posted by FlyinRyan View Post
For what it is worth, even with the IAT being read in the intake manifold, my data in another app with a plastic intake tube showed a drop in IAT when header wrap was used. The measurement used was IAT over ambient temp.
Right - I would think that header wrap on the intake would insulate it from the heat of the engine bay better. That may be the next step after I get measurements this week.
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  #28  
Old 08-07-2011, 01:01 PM
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Re: Intake air temperature

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Originally Posted by elvisisdead View Post
Right - I would think that header wrap on the intake would insulate it from the heat of the engine bay better. That may be the next step after I get measurements this week.
It absolutely does. The IATs in the tube would show an even more dramatic decrease in temp, as in my application (a 4 cyl honda), the air has to pass through a hot TB, and a hot METAL intake manifold before temps are read.

There is only so much you can do if the air being sucked in is already piping hot, but doublewrapping the tube with headerwrap will minimize any further heating of the air.
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  #29  
Old 08-07-2011, 02:14 PM
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Re: Intake air temperature

^^^too bad they cant come uop with some nice looking header wrap.....LOL
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  #30  
Old 08-07-2011, 02:53 PM
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Re: Intake air temperature

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Originally Posted by Scottina06 View Post
^^^too bad they cant come uop with some nice looking header wrap.....LOL
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  #31  
Old 08-08-2011, 08:08 AM
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Re: Intake air temperature

Whoa. Measurements this morning:

Ambient temp: 77
Bwoody intake surface temp: 138

IAT Measurements: Min: 95 Max: 134.6 Mean: 114.8

I'll measure for a few more days, but based on 1 day - this isn't looking good. If by the weekend it's still running this hot, it's back to the OEM setup.
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  #32  
Old 08-08-2011, 11:48 AM
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Re: Intake air temperature

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Originally Posted by elvisisdead View Post
Whoa. Measurements this morning:
Ambient temp: 77
Bwoody intake surface temp: 138
IAT Measurements: Min: 95 Max: 134.6 Mean: 114.8

I'll measure for a few more days, but based on 1 day - this isn't looking good. If by the weekend it's still running this hot, it's back to the OEM setup.
So, does this mean you have a hot air intake that does not make any more hp and cost you over $250?



BTW: This AM, ambient air temp 67F and IAT 77F.
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  #33  
Old 08-08-2011, 12:50 PM
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Re: Intake air temperature

^^ I am very surprised at these numbers...I have a 4" bwoody, 2wd 5.7L...I had an Airaid intake before and a bwoody now...the bwoody IAT sensor reading is always 2-5 degrees higher when moving (freeway or over 40 mph) than when idling @ a stop...I have seen it jump 30 degrees over Ambient temp in minutes. Bottom line is, that IAT sensor is so far away from the engine heat, the filter is so low it is pulling from under the bumper and I removed the rubber flap next to the radiator for more air flow. I would be interested to see what the IAT is stock after driving 5+ mins on the freeway vs. ambient temp. I could care less about traffic, and I have never tracked her so that would play into it...but I care about what its like when moving, and moving the IAT on the BWoody is never 2% higher than ambient. thoughts??? I am really enjoying this thread.

Ambient Temp: 65
IAT on freeway: 67
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  #34  
Old 08-08-2011, 01:58 PM
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Re: Intake air temperature

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Originally Posted by Walt View Post
So, does this mean you have a hot air intake that does not make any more hp and cost you over $250?



BTW: This AM, ambient air temp 67F and IAT 77F.
At this point - YES. Let me serve as a warning to others. We'll see how it goes this week.
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  #35  
Old 08-08-2011, 03:33 PM
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Re: Intake air temperature

Interesting measurements, but can you feel any difference in performance through the old butt dyno?
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  #36  
Old 08-08-2011, 05:21 PM
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Re: Intake air temperature

Quote:
Originally Posted by 08Hemi View Post
^^ I am very surprised at these numbers...I have a 4" bwoody, 2wd 5.7L...I had an Airaid intake before and a bwoody now...the bwoody IAT sensor reading is always 2-5 degrees higher when moving (freeway or over 40 mph) than when idling @ a stop...I have seen it jump 30 degrees over Ambient temp in minutes. Bottom line is, that IAT sensor is so far away from the engine heat, the filter is so low it is pulling from under the bumper and I removed the rubber flap next to the radiator for more air flow. I would be interested to see what the IAT is stock after driving 5+ mins on the freeway vs. ambient temp. I could care less about traffic, and I have never tracked her so that would play into it...but I care about what its like when moving, and moving the IAT on the BWoody is never 2% higher than ambient. thoughts??? I am really enjoying this thread.

Ambient Temp: 65
IAT on freeway: 67
the OP has a wk2. its a short ram bwoody that is sucking in under hood air.

your wk1 bwoody is way low and does bring in colder air than found under the hood.
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