BMC filters and Porsche's view

[Carl9729]

I hear apparently Porsche themselves use BMC filters in the GT4RS rather their previous paper versions.

Now that Porsche essentially have approved BMC themselves what do think the view of Porsche is if BMC filters were fitted to a GT4/GTS 4.0?

I had wondered if these particular filters provided adequate engine protection and in most vehicles they are regarded as snake oil and do not yield any performance benefit, and in some instances can harm performance especially in NA engines. But if Porsche have them as standard in the GT4RS then there must be something in it?

[andygo]

Carl9729 said:

I hear apparently Porsche themselves use BMC filters in the GT4RS rather their previous paper versions.

Now that Porsche essentially have approved BMC themselves what do think the view of Porsche is if BMC filters were fitted to a GT4/GTS 4.0?

I had wondered if these particular filters provided adequate engine protection and in most vehicles they are regarded as snake oil and do not yield any performance benefit, and in some instances can harm performance especially in NA engines. But if Porsche have them as standard in the GT4RS then there must be something in it?

$$$$$$

[Slippydiff]

They were good enough for a 996 Cup car 20+ years ago, so I see no reason why they wouldn't be good enough for a modern Porsche.



And Manthey used them too :

[darreni]

BMC filters are also BMW factory fit on the E46 M3 CSL.

https://www.apmotorsport.co.uk/product-page/bmw-m3...

[GTRene]

Interesting, did not know those were used for those brandsas OEM, another good filter on my list of air filters.

[richyd]

They’re standard on the RS models apparently.

I fitted them to my GT4 a few weeks ago. Throttle response is definitely sharper, but other than that feel or hear very little real difference

[gtsralph]

Ehresmann upgraded to these when tuning the 3.8L engine in my old 981 Cayman S with and they gave an extra 5PS right at the top end, otherwise no discernible difference.

[GTRene]

you can keep them longer on, and clean them and so on, instead of a paperfilter, so there are some pro's incl some little power gains in some cases.

I guess they can make a bit louder intake sounds, but in the back of a Porsche 911 its hard to hear the differences I guess maybe if you ad a carbon housing around it, it can make a more clear sound?

btw, Personally I would make at least half a housing (between filter/belts and parts) at the underside when I look at those engine bay pictures, to protect the filter from the dust/things the belts can throw at the filter and or a bit heat protection coming from down under, but thats me :-)

[darreni]

They can be washed and reused. The CSL filter is not oiled. It comes dry and is intended to be run that way.

[GTRene]

darreni said:

They can be washed and reused. The CSL filter is not oiled. It comes dry and is intended to be run that way.

I guess they use them dry because of the air sensor inside, some spray to much filter oil in the filters and then (specially a tuned engine) when you floor the throttle, the engine sucks air a lot, and then also some of the fresh oil in the filter if its to wet... then that goes also over the thin air sensor (forgot the name) and can lay a film over it so the engine can get the wrong inputs/measurements.

I guess thats why Porsche likes it dry to keep the sensor clean of the oil from some to enthousiast reoiling the filter.