Any reccomendations on Panel Air filter for the M, want to replace standard with something that alows it to breath a bit better. Wondered who's changed and what your thoughts are..... Assume its not the same as in the 3l ?
Panel filter
- Thread starter Entwistlea
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It's not the same as the 3.0l you're right.
PN 13717521033 for the standard M filter I believe.
If your current filter is very dirty a new BMW one will make a difference in itself. The stock filters are usually best at filtration, oiled ones like K&N will allow more flow but slight possibility of oil contamination on your MAF sensor if you over oil it.
PN 13717521033 for the standard M filter I believe.
If your current filter is very dirty a new BMW one will make a difference in itself. The stock filters are usually best at filtration, oiled ones like K&N will allow more flow but slight possibility of oil contamination on your MAF sensor if you over oil it.
current one is fine, just fancy upgrading to allow a little more air in when i need it 
Appreciate the gains are likely minimal, but heard horror stories about the induction kits fouling the maf....
Appreciate the gains are likely minimal, but heard horror stories about the induction kits fouling the maf....I would keep to the standard BMW filter to be honest. Although more restrictive per inch, when unfolded the BMW filter will have massively larger surface area than an aftermarket filter. The gains are minimal and although the aftermarket filters don't advertise this, they will allow more than twice as much crap into the engine. FOr something as simple a design as a filter, you have to ask yourself why BMW don't use them? ANd it's not down to noise levels I don't think, but years of research.
Just found this online click http://www.bobistheoilguy.com/airfilter/airtest3.htm I haven't read the test right through but I think the conclusion is similar to another test I saw years ago - paper is best.
Just found this online click http://www.bobistheoilguy.com/airfilter/airtest3.htm I haven't read the test right through but I think the conclusion is similar to another test I saw years ago - paper is best.
Interesting article
Basically common sense that a filter that is 'high flow' will allow air to pass through it faster than the stock OEM paper ones improving throttle response. But it also allows more particles of dirt to pass through as well. Hence K & N say their filters take out 99% compared to OEM. Question is 'how much damage does 1% extra dirt do to your engine over a period of time?'
Answers on a postcard to 'my engine's blown up' BMW Z4MC Club'
Basically common sense that a filter that is 'high flow' will allow air to pass through it faster than the stock OEM paper ones improving throttle response. But it also allows more particles of dirt to pass through as well. Hence K & N say their filters take out 99% compared to OEM. Question is 'how much damage does 1% extra dirt do to your engine over a period of time?'
Answers on a postcard to 'my engine's blown up' BMW Z4MC Club'
sammyz said:Interesting article
Basically common sense that a filter that is 'high flow' will allow air to pass through it faster than the stock OEM paper ones improving throttle response. But it also allows more particles of dirt to pass through as well. Hence K & N say their filters take out 99% compared to OEM. Question is 'how much damage does 1% extra dirt do to your engine over a period of time?'
Answers on a postcard to 'my engine's blown up' BMW Z4MC Club'
99%, that could actually mean it allows double the number of particles through compared to OEM. If it were a no pain gain, I'm sure manufacturers would use these 'better' filters if that was indeed the case. Manufactuers spend a lot of R&D. So I would assume over a period of time, any gains made might actually not be worthwhile all things considered. Paper filters have been used for many many years, wonder why that is
.I'm currently looking around for a possible second car and must admit when I saw "K&N replacement filter fitted" in an advertisement to 318 that looked nice apart from that I thought "no chance". Easily reversible but you just don't know if any damage has already been done by the oil and/or particles
I bought the RPI scoop second hand and I did notice a huge amount of crap, dead bugs etc trapped on the filter when I gave it a clean before fitting. In comparison the OEM filter was very clean. This is due to the position of the scoop which takes it's air in directly from the grille at the front, whereas the OEM intake hangs down drawing much of it's air from within the engine compartment so a lot of the crap would not be drawn into the intake. I will leave the RPI on for a while and decide if the gains are worthwhile.