CAI = Higher fuel consumption?

[dentinger]

hmmm...
interesting thread...
something interesting i noticed that has to do with the km's remaining on the display (i thought i'd write this, seeing how we're talking about km's driven and fuel consumption)

1) when i fill up my tank, it says 750km's remaining. the most ive ever gotten is 500km's, and that was 50/50 city and highway driving.
2) if i drive like a granny, and shift at really low rpms (2000) i can get slightly more kms than what its saying i have left. ex. the other day, i drove 32km's, but the according to the km's remaining, it said i have 30km's less (so i gained 2 km's?)
3) on the highway going to the last meet on the 407, i traveled 30km and checked my display. it hadnt changed at all. it was still saying 400km's left on the tank. i actually think my remaining km's went up....
4) just for fun, i slammed on the gas, and red lined 1, then held it at 6000 rpm in 2nd, i was losing about 1km/second.. lol
5) i looked at my fuel comsumption when i was cruising at ~150ish, and it was reading 5.2L/100km's.... thats equal to ~42 MPG!!!
arent our cars supposed to get like, ~30ish mpg on the highway?? or was it just because i was driving so fast??

[Wild Weasel]

The computer comes up with that "km's remaining" figure based on your average consumption and the fuel remaining.

Your average consumption is mostly dependant on how you drive. The computer knows nothing about EPA estimated mileage figures.

[1flycdnM3]

What about "less resistance = less work = less fuel needed"? It's all dependant on how you drive the car.

this would also be true without the intake though. making my point still the same. if you drove like "grandma" before you got the intake and then "put the pedal to the metal" after the intake was installed then obviously there will be a difference...

Not sure what this statement means because your car is actually doing MORE work because it is producing MORE power to the engine because of MORE air-flow...

[Wild Weasel]

It's only producing more power when you're putting the pedal down. When you're not, then it's producing the same power as before, but working less to do so.

Consider travelling on the highway with the cruise control on at 115 km/h.

You need to be producing x hp in order to maintain this speed. x is the amount of power needed to keep the engine turning and the car moving.

If the engine is now easier to turn, because it can breath easier or expel exhaust easier, then you now only need x-0.05 hp to maintain this speed. Creating that tiny bit less hp uses less fuel.

I fully acknowledge that the difference is pretty trivial, but it is not completely intangiable and with a number of mods together, they'll add up to something measurable.

[M3!]

Looks like i'll be keeping the CAI for a while longer.

[MattC]

Ive had my CAI on for 3 fills now, and I have seen noticably improved fuel economy...

I must get like 50+ more clicks per tank now!

And I have to say for the first 2 fill ups i was really gunning it alot more. to hear the growl, I have cooled down on that abit, but ecomony has only improved since then.

[wingnut12]

I noticed a large difference in the mileage after getting my first CAI installed.

Sure, I drive mostly highway, but it's rare to get less than 600 km to a tank, even with the A/C on. Before that it was about 50 kms less, and I drive the same route every day. Then again, I drive the exact same way as I did before getting it installed.

[MattC]

600km per tank? christ.

2.0 or 2.3?

[wingnut12]

2.3. Highest I ever got was 670, and usually around 630ish. I drive 95% hwy, and not usually over 120 though.

[MattC]

ah ic,

I guess if i ever go on a long roadtrip ill maybe post numbers like that, i hope one day.

[jeromethebus]

'07 2.0l auto
Just finished my 1st tank and got 650 kmtrs. Pretty much drove like a ***** and mostly highway.

[JonsMazda]

drove to D.T Montreal from D.T Toronto with 1tank....thats around 620kms. Not bad, not bad.

[phoenix_bladen]

cool

[JonsMazda]

cool

Awesome, your first post!