Last post on Sep 04, 2007 at 10:50 PM
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Honda Civic, Performance Mods, Coupe, Sedan
#10 of 11 Re: upgrades [caaz]
Aug 30, 2007 (12:36 pm)
Hey -- can I jump in on the K&N piece? I've got an '06 Civic Hybrid and am wondering if a K&N filter will help MPG -- don't care about power increase per see, just mileage. Whaddya think?
#11 of 11 Re: upgrades [ddfreet]
Sep 04, 2007 (10:50 pm)
Putting a K&N filter on a Civic Hybrid will not help MPG, for two reasons. Firstly, modern fuel injected cars use a closed loop mixture control system, in which an oxygen sensor in the exhaust pipe constantly monitors the air/fuel mixture, and compensates for any variation in fuel mixture by automatically changing it back to the factory setting. So you really can't change the mixture by making external modifications to the engine. Racers who want to change the mixture have to do so by modifying the computer. The only effect a lower restriction air filter could have is to change the mixture; and the computer on this car will automatically compensate for any mixture changes. Secondly, the fuel mixture in this car is already factory set for maximum economy. So, even if the mixture could be made any leaner or richer, it would just make the mileage worse.