AzzyAston
Member
Registered: 16th Apr 10
User status: Offline
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There's allways been the argument weather an air filter makes ur car less eficiant with peterol yet i hear from others in enchances it, anybody want to tell me the truth with some reasoning 
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Pete_vxl
Member
Registered: 24th Nov 06
Location: Lochgelly, Fife
User status: Offline
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Expect every answer in the book from people on here. I had a cone but put it back to air box as a drilled air box made a better noise. As for petrol neither made a difference, once you fit it you will drive faster so you can hear the difference, that will make your mpg worse.
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AzzyAston
Member
Registered: 16th Apr 10
User status: Offline
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That was my reasoing to that it is all cycological in the sense that you put your foot down more to hear the noise as u says decreasing ur MPG.... anyone beg to differ
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am4nf
Member
Registered: 27th Jul 08
Location: South Ayrshire Drives: Corsa Sport
User status: Offline
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Azzy you are trying too many big words and failing
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AzzyAston
Member
Registered: 16th Apr 10
User status: Offline
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im not failing it makes sense probably aint spelt right but F**k it ey haha
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bubble
Member
Registered: 24th Jan 04
Location: Darwin, NT Australia.
User status: Offline
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on older cars where the fuel quantity was relevant to temperature, cone filters did makes mpg worse as the filters suffered with heat soak, and therefore warmer air was being brought into combustion.
based on the stoichemtric ratio of air to fuel, the cooler the air, the better the combustion is, hence why sometimes adding cone filters can decrease power.
i have always found that original airboxes but with less restrictive panel filters work better.
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markx14xe
Member
Registered: 5th Oct 08
Location: grimsby
User status: Offline
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unless its a turbo i would say really
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N3CRO
Member
Registered: 12th Apr 07
Location: Sandy, Bedfordshire
User status: Offline
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Depends on where ya put the cone filter tbh. If you use extra tubing to put it outta the way where it won't pick up warm air or at least not nearly as much, ok maybe it wouldn't increase power and wouldn't decrease neither.
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Nic Barnes
Member
Registered: 5th Apr 04
Location: nowhere near ginger people
User status: Offline
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on my vectra driven exactly the same to work obeying all speed limits etc etc mine used to average about 28mpg. i now average 30-31 with airbox back on.
also when towing i used to get an average of 22mpg with filter, 26 on same journey on air box.
facts from my own vehicle. vectra 2.5 v6.
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