K&N air filter

[PeteJ]

I see that Nippynorman's (UK) is selling a K&N for F800. Anyone tried one? Does it do what he says it does? Does it work with ECU? Is a new tune needed to be programmed to compensate for leaner mixture? Questions questions!
What do do people think? Would love to know - regards PeteJ Braintree UK YeloS

[Roadpizza]

I've used K&N filters on my Ducati's and on my MB C 220. The Ducati's required some tuning in conjunction with the after market slip-on's. I don't believe it would require any tuning with the filter alone.Originally posted by PeteJ

I see that Nippynorman's (UK) is selling a K&N for F800. Anyone tried one? Does it do what he says it does? Does it work with ECU? Is a new tune needed to be programmed to compensate for leaner mixture? Questions questions!
What do do people think? Would love to know - regards PeteJ Braintree UK YeloS

[AZ-J]

Originally posted by Roadpizza

I've used K&N filters on my Ducati's and on my MB C 220. The Ducati's required some tuning in conjunction with the after market slip-on's. I don't believe it would require any tuning with the filter alone.Originally posted by PeteJ

I see that Nippynorman's (UK) is selling a K&N for F800. Anyone tried one? Does it do what he says it does? Does it work with ECU? Is a new tune needed to be programmed to compensate for leaner mixture? Questions questions!
What do do people think? Would love to know - regards PeteJ Braintree UK YeloS



My bike is in service this weekend, and next to it was another bike all apart. They said the bike had a K&N, now had a problem with that system, and BMW was not honoring the warranty on the system because of the K&N. I had one in last bike, but this one, I don't think so, yet.

[old Al]

the best thing about the K&N is it never needs to be replaced. however how many regular filters will you go thru to make up the difference in cost. the bike should be able to correct for the greater flow of air and it is usually very difficult to really notice a change in how the bike runs. having said all of that i switch to the K&N when my bikes need their first filter change.the K&N is just a better filter material.

[old Al]

just remembered the other point, unless the failure can be directly shown to cause the failure,here in the US, the manufacture is responsible to live up to their warranty agreement. some dealers love to try and get away with blaming anything they can on failure just to be able to get more money from you rather than accept the payment from the factory for a warranty repair.
Allen

[Pat H]

The same applies here in the UK.
The manufacturer has to prove the unapproved part caused the problem to avoid covering the warranty work.
So unless a valve was burnt or the bike was running poorly and fitting the std filter corrected the problem I can't see they have much to claim about.

[stainman]

I don't know about K & N but when my dealer fitted my Akra exhaust I got a free BMC filter.I have had no problems at all.

[lt8x7]

My dealer has actually advised me to have them fit a K&N filter when the bike goes in for its 1000km check.

[warby]

Interesting thread. I inquired with a dealer near Chicago about whether they stocked the particular K&N air filter model for the F800. They said they could order it for me, but they also recommended against installing one because they had seen problems involving excess filter oil mucking up the mass flow sensors.

Cheers,
Andreas

[henri]

In South Africa BMW Motorrad seem to have no problem with the K&N filter. In fact, my dealer recommended that I have one fitted during the 1 000km service and stated that it will in no way affect the warranty. As for the claimed performance difference, I cannot really say, since the bike was still being run in while the OEM filter was fitted. My motivation was purely savings as the filter will "pay for itself" after +- 30 000km. To date I have done 8 500km on the bike with no problems.

[WANG]

I've heard of K&Ns fouling MAF sensors when they have been over oiled, too. It was operator error, I believe, as plenty of people have used oiled-gauze filters without incident for a long time now. I don't believe the F800 has a MAF sensor, either.
They don't always make more power than OEM filters, I can think of three cases ('01 Bandit 1200, SV650, SV1000) off the top of my head where the stock element actually performed better, regardless of attempts to optimize the A/F mixture to suit. On some bikes they bring a measurable change for the better. I don't know how they work in the F800.

[kismetcapitan]

if the F800 doesn't have a MAF sensor, how does it measure airflow? MAP sensor?

[Pat H]

This link from the K&N site sheds some light on the rumours of oil and MAF sensor contamination:

http://www.knfilters.com/MAF/massair.htm

[sapo]

I bought some month ago from nippynormans the K&N and mounted a LEOVINCE exhaust ... satisfied. Easy to maintain and offering more breath to my engine ...

[WANG]

if the F800 doesn't have a MAF sensor, how does it measure airflow? MAP sensor?

Good question. I'm kinda thinking that it doesn't, but just uses other parameters (engine speed, throttle position, gear position...) to calculate how much air is PROBABLY flowing. However, I don't know. I need to buy a manual for this thing...

[beebop]

I have just put mine in for service and asked the dealer to check for "surging" at 3,000rpm I wondered whether a K&N might fix this as I have a Remus exhaust fitted and the dealer said there are no downloads to cure it - so returned without a fix??

[Greg.Donald]

I bought some month ago from nippynormans the K&N and mounted a LEOVINCE exhaust ... satisfied. Easy to maintain and offering more breath to my engine ...


Did the LeoVince and K&N result in a change in fuel consumption