Is Intake change of any value?

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Old Dec 29, 2006 | 11:18 AM
  #1  
eo11's Avatar
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From: Carterville, IL
Is Intake change of any value?

I just took the air filter out of my Hondatafied 06 TSX 5AT, and bolted the stock filter box back together. This gives one in essence a cold air intake (the intake tube is in front of the lower radiator, visible through the grill); and of course, unobstructed air flow directly into the intake manifold.
I then took the car out onto a clean stretch of road near home (scared for the lack of any air filter), and ran several 0-60 attempts. I used a standard stop watch and ran several in straight auto and several in Auto-stick shifting at 7200 rpm.
I could measure no significant difference from full filtration. (Also there was no discernable change in sound or sound level)
Is all this simple intake mod stuff a bunch of hype?
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Old Dec 29, 2006 | 11:23 AM
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TSX2345's Avatar
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You were running filter-less so there no restriction.
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Old Dec 29, 2006 | 11:31 AM
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Originally Posted by TSX2345
You were running filter-less so there no restriction.

Yes
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Old Dec 29, 2006 | 11:39 AM
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Originally Posted by eo11
I just took the air filter out of my Hondatafied 06 TSX 5AT, and bolted the stock filter box back together. This gives one in essence a cold air intake (the intake tube is in front of the lower radiator, visible through the grill); and of course, unobstructed air flow directly into the intake manifold.
I then took the car out onto a clean stretch of road near home (scared for the lack of any air filter), and ran several 0-60 attempts. I used a standard stop watch and ran several in straight auto and several in Auto-stick shifting at 7200 rpm.
I could measure no significant difference from full filtration. (Also there was no discernable change in sound or sound level)
Is all this simple intake mod stuff a bunch of hype?
the stock airbox actually draws air from the engine bay, routes it down to the wheel well then back up. so unless you disconnected a piece of the intake, you were just running a filterless stock setup, not a CAI type system
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Old Dec 29, 2006 | 11:45 AM
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You don't actually have a cold air intake by doing that. The resonator is still in place and the intake is still drawing air from the hot engine bay.

A proper intake mod (e.g injen CAI, comptech icebox/mugen airbox) DOES actually improve performance and give more power and torque (this is also dyno tested). The comptech icebox and mugen airbox will both improve throttle response and you will definitely feel it. There will also be a change in engine sound from all these intakes. Injen being the loudest and the icebox being the quietest.
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Old Dec 29, 2006 | 11:51 AM
  #6  
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^^ agree.

Put your filter back in, remove the resonator, then go back out and see if you feel a difference.
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Old Dec 29, 2006 | 01:00 PM
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I'll also agree. Put that filter back on soon, the last thing you need is to suck a stray leaf or something worse into your engine.
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Old Dec 29, 2006 | 05:28 PM
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Try putting the filter back and removing the resonator. You should be pleasantly surprised.

Its pretty dangerous to run without a filter at all. At a minimum you're sucking in dust and stray bugs. I use the Comptech icebox setup (no resonator, with air horn), when I changed my filter last I found about 8 leaves and 4 twigs under my filter.
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Old Dec 29, 2006 | 06:15 PM
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Hmm... what happens if you suck in a little leaf?
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Old Dec 29, 2006 | 08:58 PM
  #10  
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Originally Posted by PixelHarmony
Hmm... what happens if you suck in a little leaf?
Depends on what kinda leaf or leaves you are talkin about
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Old Dec 30, 2006 | 01:35 PM
  #11  
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Originally Posted by PixelHarmony
Hmm... what happens if you suck in a little leaf?
I dont' have the guts to find out... at best I would imagine the leaf combusts and you blow ash your your exhaust. At worst it blocks the air intake for one or more of the cylinders and you'd start pinging and have one heck of a time getting it out ?? I'm certainly not an expert here...
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Old Dec 30, 2006 | 02:55 PM
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A leaf, I wouldnt worry about, its when you suck up an acorn and a tree starts growing in your engine, is what I would worry about.
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Old Dec 30, 2006 | 03:32 PM
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Originally Posted by eo11
I just took the air filter out of my Hondatafied 06 TSX 5AT, and bolted the stock filter box back together. This gives one in essence a cold air intake (the intake tube is in front of the lower radiator, visible through the grill); and of course, unobstructed air flow directly into the intake manifold.
I then took the car out onto a clean stretch of road near home (scared for the lack of any air filter), and ran several 0-60 attempts. I used a standard stop watch and ran several in straight auto and several in Auto-stick shifting at 7200 rpm.
I could measure no significant difference from full filtration. (Also there was no discernable change in sound or sound level)
Is all this simple intake mod stuff a bunch of hype?
If you've read the TOV article, I believe their initial dyno runs didn't produce any power with the AEM short ram until the ECU 'learned' the new setup.
With the intake installed, we fired up the car again, and after bringing the coolant temp back up to the same level as the earlier runs, we made a pass. The results were not too good. Scratching our heads, I noticed the check engine light was illuminated. Uh-oh. I looked on the OBD-II software screen and saw that an odd code had been thrown by the ECU. It was related to the IAT sensor. Thinking back, before installing the intake, I believe I accidentally disconnected the IAT sensor earlier while the ignition was still on (I was running the radiator fan to cool the car down quicker) and this likely tripped the code. Using my OBD-II tool, I reset the code and we made another pass (the same thing could be accomplished by pulling the fuse to the ECU and resetting it). This time the results were much better, beating the baseline by several hp. We made another pass and the car picked up a few more hp. The ECU was "learning" about the additional air the intake was providing. I decided to run the car "free" on the rollers for a few minutes to allow it to "learn" more about the additional air and make the proper fuel trim adjustments.

After this "learning period", we made another dyno pass and the car again made a bit more power. Subsequent runs were consistent with this pass so we decided that it had stabilized. The result? A peak of 185.7hp to the wheels, and 159.6 lb-ft of torque. According to our dyno runs, a bit of torque is lost below about 3000 rpms, but at 3300 rpms it starts making more torque (and thus power) than stock, and it continues delivering more power all the way to the 7300 rpm rev limiter. The peak gain is 8.2hp but peak torque is only up by about 1.7 lb-ft.
I experienced similar results when switching to my Injen CAI. The car almost feels like it initally loses power down low until after several hard runs.

Full article:
http://www.vtec.net/articles/view-ar...&page_number=2
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Old Dec 31, 2006 | 04:58 PM
  #14  
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I was wrong

Yes, I put the filter back in within 30 minutes. It was only a test.

After reading the replies, I took another look; and I was wrong. The stock air intake is at the top of that tube from the resonator up in the engine compartment. I can now see that removing the resonator and the indirect air path might well improve induction efficiency and lower inspired air temp.
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Old Jan 11, 2007 | 03:25 AM
  #15  
asnstyle22's Avatar
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what happens if dirt and stuff gets into the engine like that? wouldnt it get damaged? and will the dirt ever leave the engine? or will it just stay there?
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Old Jan 11, 2007 | 04:40 AM
  #16  
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dirt will get into the motor.. makes your oil dirty faster.. does a little damage.. not going to completely destroy it, but does a significant amount
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