Originally Posted By: Hessam
Originally Posted By: 04SE
Originally Posted By: Shannow
Originally Posted By: Hessam
they are not worthless... if you don't drive on dirt roads, and keep most of your driving to paved street/highways, they will filter fine. Their filtering efficiency actually improves with time.
I got one in my LX450 since about 119K miles, and my engine is doing fine. no problems whatsover, and i have never even replaced or cleaned it... it's getting about time I do something about, and thinking about going back the OEM paper filter, but I am not sure I am ready to give up my 16 mpg that I get with my K&N
How does the K and N improve your fuel economy ?
I'm assuming that you are driving at normal highway speeds, and the the throttle plate is mostly closed for nearly all of that, so then how can the K and N possible give better economy, when it's the overall restriction between air intake and inlet valve that controls your airflow/load ?
Doesn't add up.
Because a multi-million dollar advertising campaign says so? Along with fancy graphs and 'estimated' HP/TQ increases.
No because I actually measure my MPG for every tank of gas. My average has been 16.2 with the K&N filter with about 75% highway and 25% city driving. with my old OEM filter my average was 15.1 and the highest tank I ever got was 15.8.
The K&N can have an increase in MPG in some engines. They engines they work on best are the old school engines, without a lot of modernized computerized management. To best of my knowledge even though the LX450 does had fuel injection, it's a very basic FI set-up and the main block is essentially an old Buick I6 from the 60's which had been used in most landcruisers until the mid 90's.
The only time a potential increase in airflow could be realized would be at WOT. Other than that, the biggest restriction is the throttle blade.