Is it true that if we change to a better intake like z-tube, popcharger... the MAS sensor will detect more air, and hence the ECU will increase fuel injection to correct the fuel/air ratio back to original settings, in return end up using more fuel?

 

Anybody knows?

 

I've heard people say that they've gained a little bit of fuel economy from those mods. There question is:

Is it the mods that will lose the fuel mileage or is it the fact that your driving faster BECAUSE of the mods and thus you are losing mileage because of it.

Just something to think about..........

 

My opinion...

Good N/A mods = more power and efficiency.

More N/A power & efficiency = less throttle for the same speed.

Less throttle = better gas mileage.

Unless new N/A mods = heavier right foot.

The same may work for some FI setups... depending.

DaveO

 

If you don't change your driving style after you do breathing mods, you should actually get better gas mileage (might be minimal, but you shouldn't lose mileage).

 

Well, thats what I though too, but technically speaking, the ECU will try to keep the preset fuel/air ratio to keep the engine within specs. So more air will eventually lead to more fuel injected to compensate. The ECU will adapt eventually. That's what the infiniti tech said. Thats why I had to ask...

 

what about since the intake is breathing easier, it is less strain on the engine? That stupid baffle definitely seems to mess up the air flow.

 

I thought more air to the engine made the fuel burn more efficiently....thus, giving you at least the same fuel economy, if not better.

 

I haven't recieved my intake yet, so I don't know for sure... but I always thought that when the sensors read more air, the ECU compensates with more fuel? Our ECUs are constantly relearning, and if that's the case, how is it not going to change?

 

dofu......

Mac user? I just saw where you were from.

Yes, the ECU is always learning. Who really knows what the car does when you put on an intake? In theory, the car should get better mileage from getting more air. What the computer actually does is beyond me. For all I know, I DOES cause the car to burn more fuel.

I can assure you guys though that if you put on an intake, the difference in gas mileage will be so little that you'll barely notice it. That's a promise.

My personal experience is.....I'm getting BETTER fuel economy now than when I purchased the car back in April. I know this for a fact. I used to fill the car up 3 times a week. I'm down to 2 times a week now. All this and I actually drive the car harder now.

 

I've notice a light if not null MPG gain from my z-tube pop combo. Which is slightly better 2 weeks after a reset. I went back to stock for about a month and was getting a slight decrease.

 

The engine is trying to keep itself within performance specs on more levels than just the air/fuel mixture. Just like with using a lower octane gas (in the sedan at least) the ECU will adapt the timing, etc to compensate for lower gas performance. If the increase in air flow increases the efficency of the engine then the ECU should compensate accordingly giving you more power for less "effort" (not sure of a better way to say that). Which should still give you better gas consumption (not neccessarily milage since most of us play with those mods more than we did with it stock )Someone can correct me if they see a flaw here - but from my own reasoning coupled with the knowledge I do have this seems sound.

 

My gas mileage sucked stock and it sucks now! Because I'm always WOT!!!

If you try to add performance to your car you are probably a very "spirited" driver - gas mileage is an after thought since the right foot is doing the thinking for you!