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Anybody else install a K & N performance air filter in their Disco? I just put one in mine a week ago and it seems to drive way better. From smoother acceleration and shifting. It's been dramatic. Just wanted to see if anyone else had noticed similar
 

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I have heard good things about the K & N filters. I ordered one and will get it on Sunday. Going on a 1000 mile road trip next month so ill test it out for sure next month.

Thanks
Ryan
 

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I've had it in for 2 weeks now driving 90 miles a day in city and highway conditions and the car still drives a lot smoother. I used to put the car in Sport mode at places where I needed to have strong acceleration and I don't seem to need to do that anymore. It wasn't my intent or even hope that it would have that effect just a nice unexpected improvement. Ryan, I'll be interested to hear your observations.
 

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So I installed the new air filter, and I think 2Fly is right. I did notice smoother shifting and I think better acceleration. I drove around town and in a small community for 5-10 minutes to see how it handled in stop and go situations and I believe there is something to this new air filter. My old air filter (12,000 miles on the odometer) looked good still and had some large particles (leaves and seeds) that were present but nothing that would obstruct the airflow.
 

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I wouldn’t recommend a K&N filter if you are driving anywhere but paved, urban roads. K&N filters are notorious for not filtering out the small particles (dust/silt/sand) that are caught by the oem filter. In fact, there are many online articles referencing this issue, as well as well documented engine failures due to build-up of foreign particles. The performance K&N claims comes from the increased airflow and decreased filtration.
 

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I wouldn’t recommend a K&N filter if you are driving anywhere but paved, urban roads. K&N filters are notorious for not filtering out the small particles (dust/silt/sand) that are caught by the oem filter. In fact, there are many online articles referencing this issue, as well as well documented engine failures due to build-up of foreign particles. The performance K&N claims comes from the increased airflow and decreased filtration.
That certainly makes sense. A way to improve performance is to increase air flow. The only way to increase air flow by replacing the air filter is if the filter is more porous - i.e. larger holes in the filter. While this allows more air, also allows larger bits that would have otherwise been caught. Can't be too good for the engine overtime. Even if these pieces eventually are caught in the oil, and filtered, there has to be some damage done in the interim I would think...
 

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Of course I wouldn't expect anything else from the supplier..... LOL

look...an independent data..... now you CAN decide for yourself:

The following data is provided by Testand Corp. in Rhode Island. Testand makes the $285,000 machines that perform the SAE J726/ISO 5011 air filter test standard. Any air filter that wants to be tested for performance and efficiency uses this test. These tests cost $1,700 per filter when done by an independent laboratory. Testand Corp. was interested in the comparison study and agreed to do the study for us.

Every filter listed was tested in an identical manner according to the SAE/ISO test standard> Here are the results:


In the order of EFFICIENCY (ability to filter dirt) the results are as follows:

FILTER % EFFICIENCY

AC Delco OE 99.93%
Baldwin paper 99.72%
No name pargain paper 99.32%
AFE Pro Guard 7 panel filter 99.23%
WIX/Napa Gold 99.03%
Purolator paper 98.73%
Amsoil, new style 98.63%
UNI 97.93%
K&N 96.80%


FLOW RESTRICTION from best to worst. Remember, 27.7 inches of water = 1 psi. So, 1 inch of water = .036 psi. The worst (AC Delco) at 6.23 in. water and the best (K&N) at 4.54 in. water is a difference of 1.69 in. of water or a "whopping" .0608 psi. Virtually negligible.

In order from least restricive to most:

FILTER RESTRICTION in inches of water

K&N 4.54
Mystery bargain 4.78
AFE Pro Guard 4.99
Purolator 5.05
WIX/Napa Gold 5.06
UNI 5.40
Baldwin 5.71
Amsoil 5.88
AC Delco 6.23


DIRT HOLDING CAPACITY. From best to worst. This is the AMOUNT of test dirt it took to create an ADDITIONAL 10 inches of restriction. At that point the test is terminated. This is an indication of HOW LONG a filter is good before it must be cleaned or replaced.

FILTER Dirt Holding Capacity

AC Delco 573.898 grams
WIX/Napa Gold 447.366 g
Purolator 388.659 g
Baldwin 388.154 g
UNI 374.638 g
Mystery bargain 350.402 g
AFE Pro Guard 7 232.516 g
K&N 211.580 g
Amsoil 196.323 g


TOTAL DIRT PASSING THE FILTER DURING THE TEST. This is how much dirt your engine will take in if you use the filter for the duration that would cause the filter to become "dirty" enough to need replacement or cleaning. The "Dirt Passing The Filter" is the dirt collected by the "POST FILTER" during the SAE/ISO test.

In order from best to worst, the filters performed as follows:

FILTER DIRT IN GRAMS PASSED

AC Delco 0.4g
Baldwin 1.1g
AFE Pro Guard 7 1.8g
Mystery bargain 2.4g
Amsoil 2.7g
WIX/Napa Gold 4.4g
Purolator 5.0g
K&N 6.0g
UNI 7.9g
 
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