Originally Posted By: heyu
Originally Posted By: Rolla07
I recently swapped out my reusable Spectre air filter and put in a fram paper element. Never noticed any difference before but the mileage on my last tank was much better and the reusable one never had that effect before. It was dirty on one side so clearly it filters well..but if less air is pulled into the engine wont it increase the fuel sent? Maybe im not understanding it right...
There ya go ,It don't take a rocket scientist to put 2 and 2 together that with a computer controlled engine you will lose gas mileage with a aftermarket reusable air filter ---more air flow signals MORE fuel---If you want fuel economy in your daily driver forget K&N
Yeah that makes sense --- NOT...
That free flowing air filter will possibly give better performance at WOT and make little if any difference at partial throttle opening... Assuming you drive the same, the throttle opening would be less(no doubt ever so slightly) to achieve same results... As far as gas mileage it would only decrease if one WOTs continually, in essence a restrictive filter in a MAF EFI system acts as a governor...
Now on a carbed vehicle all this goes out the window, any flow reduction that causes a vacuum increase between the filter and carb will increase the A/F ratio, causing a rich condition and loss of fuel mileage... A clean filter is required with a carb to maintain best performance...
Originally Posted By: Rolla07
I recently swapped out my reusable Spectre air filter and put in a fram paper element. Never noticed any difference before but the mileage on my last tank was much better and the reusable one never had that effect before. It was dirty on one side so clearly it filters well..but if less air is pulled into the engine wont it increase the fuel sent? Maybe im not understanding it right...
There ya go ,It don't take a rocket scientist to put 2 and 2 together that with a computer controlled engine you will lose gas mileage with a aftermarket reusable air filter ---more air flow signals MORE fuel---If you want fuel economy in your daily driver forget K&N
Yeah that makes sense --- NOT...
That free flowing air filter will possibly give better performance at WOT and make little if any difference at partial throttle opening... Assuming you drive the same, the throttle opening would be less(no doubt ever so slightly) to achieve same results... As far as gas mileage it would only decrease if one WOTs continually, in essence a restrictive filter in a MAF EFI system acts as a governor...
Now on a carbed vehicle all this goes out the window, any flow reduction that causes a vacuum increase between the filter and carb will increase the A/F ratio, causing a rich condition and loss of fuel mileage... A clean filter is required with a carb to maintain best performance...