Anyone have a K&N engine filter and do they improve anything?
08-13-22, 07:18 AM
#2
Lexus Test Driver
08-13-22, 07:26 AM
#3
No significant gain but more risk to your sensors. Just stick with OEM and change it when required.
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jgscott (08-13-22)
08-13-22, 08:07 AM
#5
08-13-22, 08:24 AM
#6
I have a drop in K&N airfilter for my stock air box, not a cold air intake. I can say you get a bit more induction sound and throttle response is better. As far as power, doubt an change what so ever, however my MPG AVG has seemed to improve. Before I would avg 18-19 now I avg 20-21. I do mostly city driving.
As for the oil coating the MAF issue, I've had this filter since 2019, no issues. Just make sure to clean it and not over oil it.
As for the oil coating the MAF issue, I've had this filter since 2019, no issues. Just make sure to clean it and not over oil it.
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jgscott (08-13-22)
08-13-22, 08:54 AM
#7
Yup. And nope. Installed the drop in K&N i think around 10k miles and just crossed 60k on my car. Other than not worry to replace it every 2 - 3 years, I have seen no benefit. The only reason I got it was because I got a crazy good deal on it. I think I paid like under 30 bucks shipped and taxed. If I had to pay the regular price, I wouldn't have done it.
Also, no issue with MAF (knock on the wood).
Also, no issue with MAF (knock on the wood).
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08-13-22, 09:09 AM
#9
One thing I forgot to mention it is washable and you will have to clean it. They have instructions online on how to do it. You will need their cleaning kit. I need to do mine soon. I also just remembered my spouse's RX also has a K&N drop in, so far so good. Its' been in for about 1 year.
08-13-22, 12:57 PM
#11
Pit Crew
I have a K&N air filter on my motorcycle. It's a nuisance to wash, dry overnight, and oil the next day. But I put less than 2000 miles a year on that motorcycle, so I don't have to do it often. I wouldn't want to do it to a daily driver car.
08-13-22, 02:10 PM
#12
There are millions of threads about K&N filter on the web for years. 99% are inaccurate. Two independent Filter Engineers provided results of real like engine cfm, temperature, materials expansion, flow efficiency, and particle filtration, with explanations, and debunked the 99% wrong who had nothing. Here we go.
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08-13-22, 02:23 PM
#13
Instructor
I have no experience on the Lexus GS 350 but I have had numerous K&N filters through the years. If you do not overoil them, they are great in that you don't have to change them for years unless you drive down gravel roads all year long.
I currently have one in my carbed Buick GS that has been there for 30 years. Cleaned it and oiled it once about 10 years ago. I still have enough oil to clean it and oil it again. I had one in Buick Grand National and never cleaned it though I didn't own that car more than 3-4 years.
You will not get any more performance or HP from one. When I first got mine 30 years ago, I tried it with a new paper filter, no filter and the K&N. The paper and K&N were within the margin of error in the 1/4 mile tests. 12.45, give or take a few 100ths. The run with no element but the housing in place to smooth air flow only got it to 12.44 range. Still within the margin of error. They used to claim they filtered better the dirtier they got but I would also expect them to be more restrictive.
For the Lexus to gain HP, you would have to find the filter was a restriction and I don't think the factory filter is the limiting factor. It rarely is unless it is clogged with dirt and debris.
To verify the factory filter isn't a restriction, see what your vacuum reading is at WOT. If it isn't near 0, you have an induction restriction.
I currently have one in my carbed Buick GS that has been there for 30 years. Cleaned it and oiled it once about 10 years ago. I still have enough oil to clean it and oil it again. I had one in Buick Grand National and never cleaned it though I didn't own that car more than 3-4 years.
You will not get any more performance or HP from one. When I first got mine 30 years ago, I tried it with a new paper filter, no filter and the K&N. The paper and K&N were within the margin of error in the 1/4 mile tests. 12.45, give or take a few 100ths. The run with no element but the housing in place to smooth air flow only got it to 12.44 range. Still within the margin of error. They used to claim they filtered better the dirtier they got but I would also expect them to be more restrictive.
For the Lexus to gain HP, you would have to find the filter was a restriction and I don't think the factory filter is the limiting factor. It rarely is unless it is clogged with dirt and debris.
To verify the factory filter isn't a restriction, see what your vacuum reading is at WOT. If it isn't near 0, you have an induction restriction.
08-13-22, 04:43 PM
#14
Lexus Test Driver
I currently have one in my carbed Buick GS that has been there for 30 years. Cleaned it and oiled it once about 10 years ago. I still have enough oil to clean it and oil it again. I had one in Buick Grand National and never cleaned it though I didn't own that car more than 3-4 years. You will not get any more performance or HP from one.
Last edited by bclexus; 08-13-22 at 04:51 PM. Reason: Added picture of Knuckles Buick Grand National a split second before he blew the engine
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08-13-22, 04:52 PM
#15
Instructor
Some of the boys can stand them on the back bumper, though. The turbo looks like it is big enough to have been on the space shuttle and it was facing forward through the bumper with no filter, K&N or otherwise.
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