AIr Filter=GAS MIleage

[geeves]

A friend of mine put a KN air filter in his RR and is now getting over 100 mi. more per tank. Trying it on LR3 will let you know

[LR3ROVER]

Be very careful w/ this filter off-hwy. (collects lots of dirt) Also, watch out for the oils of the filter and your MAF sensor. I had many problems w/ this filter and it coating the sensor and had to replace many. I know the K&N website says this is false, but if the shoe fits. I had oils of my MAF, how else could it have gotten there?? Hope this helps.

[Disco Mike]

That claim is totally impossible, you can't get a 4 MPG improvement from an air filter.
Most K&N's used on Rovers have shown about 1/4 MPG improvement before they foul out the MAF cost in some instances as much as a $600 replacement.
Save yourself tons of $$$ and take the K&N off your LR3 before you get that opportunity to buy a new MAF also.
Mike

[sideview]

I used the K&N filter in the LR3 for a while, improved MPG was negligible, didn't notice too much power difference either.

[rockhouse]

K&N filters flow more air by not cleaning it a well. End result is that all that dirt ends up in your oil. It is then circualted thoughout the engine causing premature wear. The origional filter does a much better job of filtering. If you want a reusable one use the Amsoil one. It works well. As for the originator of the post, You wanna buy a bridge?

[bartell]

Originally Posted by geeves

A friend of mine put a KN air filter in his RR and is now getting over 100 mi. more per tank. Trying it on LR3 will let you know

Power is limited by the amount of air you can get into any engine. Therefore, a better flowing air filter increases horsepower. We have never failed to dyno an extra 4-6% after installing a K&N. That will translate into better mileage but it will NOT be 100 miles a tank and it will depend on which fueling system you have.

K&N's do not filter as well as poorer flowing filters, but the difference is negligible and, if you often drive off-road, you can get their off-road kit which covers the filter and screens out far more debris than a stock filter.

K&Ns are cleanable. So the K&N will last the life of the vehicle.

Now the bad news;

K&Ns are oiled. As with any other quality filter using oil as filtering agent, they can coat an AFM when they are very heavily over-oiled. The easiest way to avoid that is follow instructions carefully, wipe it and then let it sit overnight after oiling.

Additionally, K&N's can present problems for some LRs. The fuel maps on the 3.9s and 4.2s are too lean to begin with. Better airflow makes them even leaner. On the GEMS and Motronics versions, the engine management should be able to adjust to the better flow. If not, you will pick up a fault code indicating a mixture issue.

JB