Air filter options for a 390SE

[ed_crouch]

Hi all,

I know this sorta thing has been done before, but the old threads dont really answer my question:

Whats the crack with pukka K&N vs K&N copies vs foam air filters?

I am about to pop a new one on mine, and dont know which of the 3 is the best way to go. The foamie ones claim to give least restriction, but they look pants, and the K&N is a little dear at about 60 quid.

Will the fifteen quid twin cone K&N copy be any sense?

Linky:

http://cgi.ebay.co.uk/RED-INDUCTION-KIT-AIR-FILTER...


Cotton and chrome ones look smarter...

[adam quantrill]

The K+N ones are washable and will last forever. If you have one on there now, wash it, oil it, and job done!

[ed_crouch]

Nah its a scummy old foam one. I'm going MS2 as we speak and the air flow meter is no longer needed, so its being replaced with some 70mm polished ally duct which I ned a filter to go on the front of...

I would also like to reduce the tendency to draw hot air too. On me dads M5 we got another 30 horse (well, we found the 30 horse we'd previously LOST, you know how it is...) by bunging some thick carboard(!) between the fan efflux and the air filter. My car does sufer fluffy throttle reponse and slight drop in performance when its been sat in traffic - goes best on a cool summers evening.

Hmmm.

[adam quantrill]

The old foam one eh? I used to wash these too in the washing mashine (when the missus was out!)

[rev-erend]

adam quantrill said:

The old foam one eh? I used to wash these too in the washing mashine (when the missus was out!)

Let's hope she does nopt read PH too often.

[chunder]

ed_crouch said:

I would also like to reduce the tendency to draw hot air too. On me dads M5 we got another 30 horse (well, we found the 30 horse we'd previously LOST, you know how it is...) by bunging some thick carboard(!) between the fan efflux and the air filter. My car does sufer fluffy throttle reponse and slight drop in performance when its been sat in traffic - goes best on a cool summers evening.

Hmmm.

I built a cold air box where the expansion tank normally is and mounted a new Range Rover tank on the bulkhead right in the middle. The box is pretty big and is shaped to to make the most of the space, extending down around the wheel arch. It houses the AFM (mine's to go shortly as well !) and filter and the injector resistor pack which used to get very hot, has a lid and is insulated using air con padded reflective finish insulation. It was made from a sheet of galvanised tin someone threw out. It is fed with a 100mm similarily insulated solid pipe (galvanised drainpipe cut and rivetted to shape) that just fits down past the power steering pump to a ram scoop (from leftover of tin sheet) fitted under the front spoiler at about the point my missing SE splitter would be i.e. about 400mm back from the nose. This puts it at a point where it doesn't strike speed bumps etc as the front wheels have already started to lift it.

Works an absolute treat, intake air is practically always at ambient which is useful when it is 48 degrees C and your sitting in traffic !

I also stuck a sensitive pressure gauage probe in there once just to see and it registerd a slight positive pressure even under WOT so it actually had a slight boost effect ...

.. at 5000rpm....


...in 5th....


didn't until that point but at least the air was cool !