The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: steve_wicks on April 11, 2009, 11:25:37 AM

Title: Performance gain with foam sock airfilters
Post by: steve_wicks on April 11, 2009, 11:25:37 AM

I removed my airbox and fitted some foam sock type airfilters as a temporary measure, but what a diffrence it has made.

The engine revs freely and seems more responsive. I was really surprised and the big problem now is that the induction noise brings out the hooliganism in me, although I wouldn't like to listen to the noise for hours on end.

The exhausts on the bike are aftermarket and are quite free flowing.

Next step is to get rid of all the pipes etc restricting the airbox and maybe run the breather into a small catch tank sealed with a small filter.

Title: Re: Performance gain with foam sock airfilters
Post by: montmil on April 11, 2009, 05:58:03 PM

Oh boy! Watch your spark plug color You may have just tuned your scooter on the way lean side of toast. Hot Hot Hot... May require some jetting changes as others have experienced.

Monte

Title: Re: Performance gain with foam sock airfilters
Post by: steve_wicks on April 12, 2009, 04:58:03 AM

Was thinking exactly the same thing - in fact I've already washed the airbox to put it back on tomorrow. Also looks like rain and those filters will be like sponges.

They actually came off my Porsche, but rain got onto them through the vent on the engine lid so I put the std filters back on...... sound familiar?

Title: Re: Performance gain with foam sock airfilters
Post by: montmil on April 12, 2009, 07:14:17 AM

Quote

... sound familiar?

Yep. If it ain't broke, don't fix it.[smiley=2cents.gif]   Monte

Title: Re: Performance gain with foam sock airfilters
Post by: steve_wicks on April 12, 2009, 11:11:21 AM

Just finished putting the airfilter back, but without all the split rubber hoses. I kept the split breather pipe and it goes straight into the airbox airbox until such time I make a new breather hose.

Haven't ridden it yet, but did look at the plugs after a 20km ride and it was lean, not terribly white, but enough to worry me beige!  

My oil leak has also reduced to almost nothing so I suspect it was on the full side of ideal and the BMW self regulating oil level system worked.

Will ride tomorrow and report back.