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Originally Posted by Huck BB62
Well, they did use a dyno. Call me nutty, but that carry's a little weight compared to the "it felt faster" point of view.
Yeah, the tests are on a diesel. I've yet to see where K&N builds their filter any different for any application from a Toyota Tercel up to a Viper.
I can't figure out for the life of me why, after reviewing the above website that tests K&N filters, someone would choose to abuse their engine that way unless they figured on selling it instead of keeping it. The test is a damnation of their media, not of the intake system, and beyond that the other test that I referenced is a test of SEVERAL systems. Today's intakes are damned well engineered and don't need, or benefit, from upgrades or modifications with a stock engine. Even at that, I will never believe the K&N claims again unless I see a dyno test, period.
The H3 intake is already a cold air system. Looking at it, and the displacement of the I-5, it's hard to see any gains to be made by spending money on the K&N or any other intake. The stock filter is very large for the engine's displacement. As others have said on here, it's an air pump. If the engine isn't capable of moving more air than the stock filter and intake are capable of flowing without restriction, then there's no benefit to spending the money on the "upgrade".
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There are 2 problems with your statements -
First- Intakes are made to flow in a compromise between air needed and durability. The engineers must take into account the worst possible environment that the H3 could be subject to. In this instance I will use a sandstorm in Iraq... the stock set-up will protect your engine in that environment... I don't plan on driving my H3 in a sandstorm so I don't need that protection. My media with less restriction will provide my engine the protection it needs while allowing better flow.
Second - No matter how large your intake it is only as efficient as it's biggest restriction. Any engine, including a lawnmower will benefit from a less restrictive air intake. A naturally aspirated engine works on Vacuum in order to pull air in and the closer you get to Atmospheric pressure the better... any media what so ever will limit the amount of air molecules that can fill the void in any given amount of time, in this case the intake valve open time. The more air molecules, the more fuel you can pack to reach your ideal air/ fuel ratio. For simplicity sake, I will use a 14:1 air fuel ratio. If I can add 14 more parts of air than you, I can add 1 more part of fuel than you. I have increased the explosive charge in my engine, X5 (1 per cylinder) over your engine, which allows me greater power.