want a k&n air filter ?
02-21-10, 11:31 AM
#1
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Thread Starter
want a k&n air filter ?
02-21-10, 08:32 PM
#3
The RX is no performance vehicle, The car probably already gets enough air already And K&N's let in 45 times more dirt into the engine then a normal paper filter, I will personally pass on this. no point?
Just my $0.02
Just my $0.02
02-22-10, 05:06 AM
#4
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Thread Starter
they're more likely after a lifetime filter & potential improved fuel economy
"45 times more dirt" is quite a statement, do you have supporting evidence
i couldn't imagine manufacturers not voiding warranties if they discovered you were allowing 45 times more dirt in to your engine
i'm not recommending anyone purchase a k&n
02-22-10, 05:39 AM
#5
The way it works could be an issue on ours
Turns out the filter does work well trapping dirt and the more it traps the better it works but it does it with a fine oil film in the element. Some of that film by nature sucks through to the sensor that controls mixture etc. It was screwing it up according to the tech. I was told that in time it may have messed with the power-train warranty. K&N's claim that it improves airflow and traps more dirt is probably true. But my feeling now is if that type of filter were better, than Lexus would make it OEM.
02-22-10, 02:23 PM
#6
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Thread Starter
I did purchase a K&N air filter for my 03 RX300. I put it in at 15,000 miles. At about 42,000 the engine started acting funny at idle, acting like it was starving then revving up to over 2000rpm and back down. I took it in and they plugged in the diagnostic gizmo while in the service drive. The 1st thing out of the tech's mouth was the question 'Do you have one of the K&N filters'? We took it out and replaced with the Lexus paper filter and it ran fine until I sold it w/63,000 miles.
Turns out the filter does work well trapping dirt and the more it traps the better it works but it does it with a fine oil film in the element. Some of that film by nature sucks through to the sensor that controls mixture etc. It was screwing it up according to the tech. I was told that in time it may have messed with the power-train warranty. K&N's claim that it improves airflow and traps more dirt is probably true. But my feeling now is if that type of filter were better, than Lexus would make it OE
Turns out the filter does work well trapping dirt and the more it traps the better it works but it does it with a fine oil film in the element. Some of that film by nature sucks through to the sensor that controls mixture etc. It was screwing it up according to the tech. I was told that in time it may have messed with the power-train warranty. K&N's claim that it improves airflow and traps more dirt is probably true. But my feeling now is if that type of filter were better, than Lexus would make it OE
i've run k&n in every vehicle i've owned since 1990 w/ no sensor damage
i believe if k&n's actually damages the sensors, we'd be reading about voided warranties, & not sensor damage claims
i don't know for a fact that k&n is better
but i don't think manufacturers will always use what's better
tuned long tube headers have been tested countless times to show they provide more hp/tq/mpg than cast exhaust manifolds, but they're not oem items due to cost
i realize they cost a bit more than an air filter
but why not use triple-edge wipers instead of the basics or rainx washer fluid
02-22-10, 03:34 PM
#7
i read about MAF damage claims due to over oiled k&n filters
i've run k&n in every vehicle i've owned since 1990 w/ no sensor damage
i believe if k&n's actually damages the sensors, we'd be reading about voided warranties, & not sensor damage claims
i don't know for a fact that k&n is better
but i don't think manufacturers will always use what's better
tuned long tube headers have been tested countless times to show they provide more hp/tq/mpg than cast exhaust manifolds, but they're not oem items due to cost
i realize they cost a bit more than an air filter
but why not use triple-edge wipers instead of the basics or rainx washer fluid
i've run k&n in every vehicle i've owned since 1990 w/ no sensor damage
i believe if k&n's actually damages the sensors, we'd be reading about voided warranties, & not sensor damage claims
i don't know for a fact that k&n is better
but i don't think manufacturers will always use what's better
tuned long tube headers have been tested countless times to show they provide more hp/tq/mpg than cast exhaust manifolds, but they're not oem items due to cost
i realize they cost a bit more than an air filter
but why not use triple-edge wipers instead of the basics or rainx washer fluid
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02-22-10, 05:20 PM
#8
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Thread Starter
02-22-10, 06:36 PM
#9
In the after market world for Mustang GT performance, K&N filters are used by a lot of folks. Including me when I had a 2002 GT vert; but not in my 2005 GT vert...I learned the hard way.
Straight off the shelf, there is not a problem with the oil leaking past the filter element into the vehicle's mass air sensor. But a major feature of the K&N is that you re-use the element by applying a K&N cleaner to get the crud off, drying it, then applying a K&N "re-oiler" solution. If I recall, you're then supposed to wait a while and let it dry out before reinstalling it.
So of course that procedure is perfect for too much oil, not enough drying time, and major problems when even a small drop of oil gets sucked-out by the incoming airstream and then lands on the mass air sensor. So while saving $30-50 bucks for replacing a large performance paper filter is appealing...replacing an expensive sensor on an emergency basis is somewhat less appealing.
Straight off the shelf, there is not a problem with the oil leaking past the filter element into the vehicle's mass air sensor. But a major feature of the K&N is that you re-use the element by applying a K&N cleaner to get the crud off, drying it, then applying a K&N "re-oiler" solution. If I recall, you're then supposed to wait a while and let it dry out before reinstalling it.
So of course that procedure is perfect for too much oil, not enough drying time, and major problems when even a small drop of oil gets sucked-out by the incoming airstream and then lands on the mass air sensor. So while saving $30-50 bucks for replacing a large performance paper filter is appealing...replacing an expensive sensor on an emergency basis is somewhat less appealing.
03-01-10, 08:13 AM
#10
i don't believe anyone on the rx forum would be purchasing a k&n for performance
they're more likely after a lifetime filter & potential improved fuel economy
"45 times more dirt" is quite a statement, do you have supporting evidence
i couldn't imagine manufacturers not voiding warranties if they discovered you were allowing 45 times more dirt in to your engine
i'm not recommending anyone purchase a k&n
they're more likely after a lifetime filter & potential improved fuel economy
"45 times more dirt" is quite a statement, do you have supporting evidence
i couldn't imagine manufacturers not voiding warranties if they discovered you were allowing 45 times more dirt in to your engine
i'm not recommending anyone purchase a k&n
But they still let in more dirt over a oem paper filter
http://duramax-diesel.com/spicer/index.htm
http://www.bobistheoilguy.com/airfilter/airtest3.htm
01-23-12, 05:18 AM
#12
Driver School Candidate
I have a 2010 RX350 and cant figure out where the ENGINE AIR FILTER is located. i used to replace it myself in my 2002 RX300 and want to do the same with this one,but i dont know how to access it. Although the owners manual mentions one it doesnt talk about how to locate and replace it like it does for most other do it yourself maintenance. Can anyone help me on this? Thanks.
01-23-12, 02:03 PM
#15
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RAIN-X experience
I've never tried RAIN-X myself and never heard that any of my friends did, but I'm intrigued that you're happy with the product. How often do you have to reapply it? Do you treat only the windshield glass or the entire set of glasses and windows?