
08-09-2006, 01:58 AM
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AF - Advisor
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Join Date: Jul 2005
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Re: Would I benefit from a K&N Air Filter?
To quote an article I wrote elsewhere. ( http://v6.lextreme.com)
Quote:
Pretty much. The power really isn't going to change much either way. Something I wrote for elsewhere:
Why most headlight, hood, and scoop induction systems are COMPLETE CRAP!
They:
1) Are never located close to a point on the vehicle where the airflow can compress itself to the highest degree possible

2) The scoop is simply not even exponentially close to being large enough to effectively compress the charge at any attainable speed, at anything above low throttle angles.
The typical pre-filter stock import intake (Which are normally well designed, and DON'T give much horsepower) most stock intakes are CAI + resonators.
Best in a category = Bold, Worst = Underlined
Before the filter @ 60mph, Pressure loss in the intake (0 = better, lower = better):
Stock : 8 in/water
No intake (Short pod intake): 0 in/water
CAI: 4 in/water
Headlight replacement ram-air: 2in/water
*Perfect huge ram air*: 4in/water
*Closed* throttle @ 60mph pre-filter POSITIVE PRESSURE (Higher = better):
Stock: 0 in/water
Short intake: 0.25 in/water
CAI: 0.25 in/water
Headlight replacement ram-air: 2.5 in/water
*Perfect huge ram air*: 5in/water
Wide open throttle total VACUUM post filter airbox, pre AFM/MAF (0 = better, others referenced from best vacuum):
Stock: -3.5 in/water
Short intake: 0 in/water
CAI: -1.18 in/water
Headlight replacement ram-air: -0.7 in/water
*Perfect huge ram air*: -5 in/water
Wide Open Throttle @ 60mph, pre-filter POSITIVE PRESSURE (Higher = better):
Stock: 0 in/water
Short intake: 0.25 in/water
CAI: 0.25 in/water
Headlight replacement ram-air: 0.78 in/water
*Perfect huge ram air*: 1.9 in/water
As can be seen.... Most intake claims are full of **i*.
Just for the total newbies that glance through the numbers... That was in/water. 1 in/water = 0.0361 psi. 1 psi = 27.68 in/water. If you can't tell, this is an *extremely* small amount of flow difference Between everything.
In-bay engine temperatures are generally only 5-20*F above ambient with the car moving at 30mph. Except for a turbo, or supercharger application where the intake temeprature will rise greatly, an N/A engine will not see much difference either way between in bay, CAI, or RAM. Have fun with that.
Once you get past basic intake restrictions themselves that can normally, easily be solved. All intakes are pretty much the same, unless you start creating problems - which a lot of people do & don't realize.
Also... The pressure drop difference between a K&N filter, and a new Toyota panel filter is ONLY 0.472 in/water difference! That's a 0.0298psi difference in intake pressure. 0.0298psi !?!?!?!?
Useless LoL!
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World's second ES 300/3vz-fe Turbo.
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