Ecoboost w/3.73 Gears, MPG? - Page 9 - Ford F150 Forum

byoungblood · 04-30-2012, 09:10 PM

Quote:

Originally Posted by TheChad

Okay, then why does a CAI typically get you better MPG's? If that's true (I'm not saying it's not), then a CAI should not give better MPG's, but they typically do!

Don't say it's because they flow better, because a stock air box will flow more air then a stock engine needs.

Personally, I think the label "cold" air intake is a bit of a misnomer unless it relocates the filter completely out of the engine compartment. From that standpoint, you're better off keeping the stock airbox as it does draw air from inside the fender. Personally I think the only reason to get one is to make the engine louder and to dress up the engine compartment a bit.

Usually the restriction in the factory intake system is usually the tube coming into the airbox itself. The so called "Gotts" mod (which is nothing new, people have been doing similar mods to FI vehicles for decades) does no more than open up that part of the intake tract, and is just as effective as these $300+ intakes.

But anyway, that is the physics of it. Cooler air is denser. If the engine is taking in more air, you have to add more fuel.

TheChad · 05-01-2012, 12:34 PM

Quote:

Originally Posted by byoungblood

Personally, I think the label "cold" air intake is a bit of a misnomer unless it relocates the filter completely out of the engine compartment. From that standpoint, you're better off keeping the stock airbox as it does draw air from inside the fender. Personally I think the only reason to get one is to make the engine louder and to dress up the engine compartment a bit.

Usually the restriction in the factory intake system is usually the tube coming into the airbox itself. The so called "Gotts" mod (which is nothing new, people have been doing similar mods to FI vehicles for decades) does no more than open up that part of the intake tract, and is just as effective as these $300+ intakes.

But anyway, that is the physics of it. Cooler air is denser. If the engine is taking in more air, you have to add more fuel.

I agree 100%, that's why if I install a CAI I won't buy one Unless it has it's own box or is completely blocked off from the engine compartment!

I also won't typically buy one with out a new intake tube, unless I have seen the inside of the factory tube and see no restrictions. (straight tube no baffles).

Though it amazes me that all the millions of $$ these manufactures spend on R&D, that they do some of these performance destroying things, especially when they ate supposedly 'trying' to get better fuel mileage!

-TheChad

EBinMT · 05-01-2012, 05:33 PM

Balance of performance and comfort. Exhaust and intakes are baffled to reduce or eliminate engine noise and/or drone. Big money in that R&D.