K&N filter
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#2
Join Date: Apr 2012
Location: Ruislip Manor, West London, UK
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Haven't bought my jag yet, but i use K&N's in both my bikes, and my UrS6.
I concur that there are subtle, but noticeable changes in all of them, including responsiveness, reduced hesitation, and even (proven) HP increases. Not much, admittedly, but it all adds up! 5% on the car, 8% on one of the bikes (VMax).
I concur that there are subtle, but noticeable changes in all of them, including responsiveness, reduced hesitation, and even (proven) HP increases. Not much, admittedly, but it all adds up! 5% on the car, 8% on one of the bikes (VMax).
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On every car forum I have been a member of, there is always some discussion that pops up about the used of K&N or similar filters. No better way to start a controversy. On one side there are those that say the filter does nothing and the oil used can actually be harmful. On the other side there are those that claim increased performance.
For me I had one of these on my previous car for about 15 years and currently have one on my Jaguar. I never bothered actually doing any dyno checks to see the impact (positive or negative) but I have never had any problem using these. I believe a stock filter, when new, will run as free-flowing as the K&N but, over time, the flow with a stock degrades while the K&N does not (unless really really dirty).
Doug
For me I had one of these on my previous car for about 15 years and currently have one on my Jaguar. I never bothered actually doing any dyno checks to see the impact (positive or negative) but I have never had any problem using these. I believe a stock filter, when new, will run as free-flowing as the K&N but, over time, the flow with a stock degrades while the K&N does not (unless really really dirty).
Doug
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Location: Ottawa, Ontario, Canada
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Actual tests conducted by ISO show differently...
And I did get tired of two things:
1. clearing the MAF sensor error codes and
2. cleaning the filter every 30 days. (Yes, after 30 days, you actually end up starving the engine as air flow is significantly restricted over factory paper)
FWIW
And I did get tired of two things:
1. clearing the MAF sensor error codes and
2. cleaning the filter every 30 days. (Yes, after 30 days, you actually end up starving the engine as air flow is significantly restricted over factory paper)
FWIW
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#10
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Actual tests conducted by ISO show differently...
And I did get tired of two things:
1. clearing the MAF sensor error codes and
2. cleaning the filter every 30 days. (Yes, after 30 days, you actually end up starving the engine as air flow is significantly restricted over factory paper)
FWIW
And I did get tired of two things:
1. clearing the MAF sensor error codes and
2. cleaning the filter every 30 days. (Yes, after 30 days, you actually end up starving the engine as air flow is significantly restricted over factory paper)
FWIW
I think you are being a bit overzealous with the cleaning. K&N recommends a service interval of 25,000 miles.
Per K&N:
4. How often do I need to clean my K&N air filter?
If you have not experienced a decrease in mileage or engine performance, chances are your filter is fine and does not yet need cleaning. To be more specific, the filter does not require cleaning if you can still see the wire screen on the entire air filter regardless of how dirty it may appear. When the screen is no longer visible some place on the filter, it is time to clean it. When used in normal paved road, street or highway conditions, our replacement air filters that fit in the factory air box should require cleaning every 50,000 miles and our large conical filters on an intake system should require cleaning every 100,000 miles. When used in dusty or off-road environments, our filters will require cleaning more often. We recommend that you visually inspect your filter once every 25,000 miles to determine if the screen is still visible.
Last edited by Vector; 06-07-2012 at 07:20 PM.
#11
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Lol at all you guys claiming noticeable improvements with a K&N drop in. It has been dyno proven that they make 0 hp on a stock XJR and XKR. Maybe 1 or 2 hp, which is in the margin of error. Certainly nothing you will notice. In fact, dyno testing showed no difference with stock paper filter and the filter removed completely.
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Lol at all you guys claiming noticeable improvements with a K&N drop in. It has been dyno proven that they make 0 hp on a stock XJR and XKR. Maybe 1 or 2 hp, which is in the margin of error. Certainly nothing you will notice. In fact, dyno testing showed no difference with stock paper filter and the filter removed completely.
For me, it is cheap enough to be worth the "feel good" notion that there might be a negligible improvement. Certainly much more bang-for-the-buck versus guys that would spend $thousands on an aftermarket exhaust with not much to show except more noise.
Doug
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