dannyb78 Posted February 18, 2014 Report Share Posted February 18, 2014 As the title... I just see in one of the Amazon adds above a K&N replacement air filter hence the question, I know on petrol engines performance air filters normally make a slight difference but unsure how well the 320d would/if atall benefit. Anybody with first hand experience? Quote Link to comment Share on other sites More sharing options...
simonlpearce Posted February 18, 2014 Report Share Posted February 18, 2014 No first hand experience, but typically performance air filters are a waste of time, even on a petrol. Quote Link to comment Share on other sites More sharing options...
mit Posted February 18, 2014 Report Share Posted February 18, 2014 The only thing it will do is stuff up your maf sensor when you oil it too much! Quote Link to comment Share on other sites More sharing options...
rickeh Posted February 18, 2014 Report Share Posted February 18, 2014 I've got a BMC panel filter in my 320i (m54b22) and it made it a lot louder. Louder on the induction noise, louder exhaust. mpg same, bhp same, fun increased ;D Quote Link to comment Share on other sites More sharing options...
Mengwalton Posted February 18, 2014 Report Share Posted February 18, 2014 Typically they make a louder induction noise and allow for more airflow through the filter as they are less restrictive BUT I have no idea on a diesel I was going to try one in my 330d but tbh I don't think it will make a slight bit off difference in a diesel as there is no throttle body like on a petrol. Sent from my HTC One using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
dannyb78 Posted February 18, 2014 Author Report Share Posted February 18, 2014 Some interesting views... not sure on the oil on the maf one though. Be interesting to know first hand experience with a diesel BMW though. In general its down to how good the factory design is in the first place, BMW do tend to put more time and effort into these areas than some manufactures though. Quote Link to comment Share on other sites More sharing options...
momo Posted February 18, 2014 Report Share Posted February 18, 2014 No.. Colin had one in his 330d and it was pointless.. Quote Link to comment Share on other sites More sharing options...
Rich_D Posted February 18, 2014 Report Share Posted February 18, 2014 (edited) I had a K&N on my last 330d, no idea if it gained any power as it was done with the remap The standard filter is huge though, so won't be much restriction Edited February 18, 2014 by Rich_D Quote Link to comment Share on other sites More sharing options...
chocka Posted February 18, 2014 Report Share Posted February 18, 2014 NO! Quote Link to comment Share on other sites More sharing options...
Daud Posted February 18, 2014 Report Share Posted February 18, 2014 i have a pipercross panel filter in mine was put in when the car was remapped so couldn't really tell you the difference sorry. Quote Link to comment Share on other sites More sharing options...
rasa Posted February 19, 2014 Report Share Posted February 19, 2014 no use what so ever, diesels run so cool com,pared to a petrol, Quote Link to comment Share on other sites More sharing options...
Rich_D Posted February 21, 2014 Report Share Posted February 21, 2014 no use what so ever, diesels run so cool com,pared to a petrol, What has running temperature got to do with air filters? Also FYI, an E39 M5 runs cooler than an E46 330d, 78c thermostat in the M5 and 88c thermostat in the 330d, so you are also incorrect dannyb78, TOOM and Mengwalton 3 Quote Link to comment Share on other sites More sharing options...
Ben- Posted February 21, 2014 Report Share Posted February 21, 2014 Put one in my 320D last year but it did absolutely nothing. Waste of money. Quote Link to comment Share on other sites More sharing options...
JasonK Posted February 21, 2014 Report Share Posted February 21, 2014 (edited) No performance benefit whatsoever. The only potential benefit is the fact that you can clean/re-use them and as such are a 'Lifetime' purchase. As others have said, though, the hassle you will get by putting a tad too much oil on and stuffing up your MAF is not worth it. Air filters aren't that expensive, and if you are looking to save a few pounds here and there on that kind of thing, perhaps a BMW is not the car to own! Sent from my Lumia 1520 using Tapatalk Edited February 21, 2014 by JasonKruys Quote Link to comment Share on other sites More sharing options...
JasonK Posted February 21, 2014 Report Share Posted February 21, 2014 MAF, not map. Damn auto correct, and damn tapatalk for not letting me edit! Sent from my Lumia 1520 using Tapatalk Quote Link to comment Share on other sites More sharing options...
rasa Posted February 22, 2014 Report Share Posted February 22, 2014 no use what so ever, diesels run so cool com,pared to a petrol, What has running temperature got to do with air filters? Also FYI, an E39 M5 runs cooler than an E46 330d, 78c thermostat in the M5 and 88c thermostat in the 330d, so you are also incorrect your on about coolant, im on about exhaust gas etc, diesels by logic are much more efficient than a petrol, fact Quote Link to comment Share on other sites More sharing options...
Rich_D Posted February 22, 2014 Report Share Posted February 22, 2014 no use what so ever, diesels run so cool com,pared to a petrol, What has running temperature got to do with air filters? Also FYI, an E39 M5 runs cooler than an E46 330d, 78c thermostat in the M5 and 88c thermostat in the 330d, so you are also incorrect your on about coolant, im on about exhaust gas etc, diesels by logic are much more efficient than a petrol, fact You said 'temperature' so I made an assumption, as 99% of the time when people talk about cars running cool it's not EGT (exhaust gas temperature), it's engine/coolant temperature. But back to the original point, EGT still has nothing to do with air filters? Quote Link to comment Share on other sites More sharing options...
rasa Posted February 22, 2014 Report Share Posted February 22, 2014 thats why i said air filter will not be no use, coz the car runs so cool and dont need cooling no more, Quote Link to comment Share on other sites More sharing options...
dooge Posted February 22, 2014 Report Share Posted February 22, 2014 Rasa, sorry mate, it still makes no sense to me either! I have a Pipercross filter, looks fancy, doesnt do anything more. Was thinking abput selling it tbh if you are interested, been in 5k miles. Rich_D 1 Quote Link to comment Share on other sites More sharing options...
Rich_D Posted February 22, 2014 Report Share Posted February 22, 2014 Air filters don't alter how hot or cold a car runs Quote Link to comment Share on other sites More sharing options...
rasa Posted February 23, 2014 Report Share Posted February 23, 2014 Air filters don't alter how hot or cold a car runsmore air = cooler, i know the filter is there to (filter) but the air induction kits etc do let air through more freely Quote Link to comment Share on other sites More sharing options...
tqadam Posted February 23, 2014 Report Share Posted February 23, 2014 Big power turbos have big intercoolers to cool the air going in the engine not 2 meter long air filters... Just saying Quote Link to comment Share on other sites More sharing options...
Rich_D Posted February 23, 2014 Report Share Posted February 23, 2014 (edited) Air filters don't alter how hot or cold a car runs more air = cooler, i know the filter is there to (filter) but the air induction kits etc do let air through more freely Edited February 23, 2014 by Rich_D tqadam 1 Quote Link to comment Share on other sites More sharing options...
Feksake Posted July 4 Report Share Posted July 4 Hi, NO dont bother. we know you love your BMW and want to buy it earings and things. But a nice dry paper air filter may prevent you having MAF sensor issues that will send you chasing your tail and costing you possibly hundreds spondoolies. Rgds Quote Link to comment Share on other sites More sharing options...
