Gas mileage with gen III intake

370Zsteve

No, that is incorrect. See Modshack's comment above. More HP = more fuel consumed. There is no free lunch.

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Rps13.jw

More Air means more fuel. The Maf will compensate.

kannibul

Not the case if you're running rich, as documented....

The Gen3 intake helps lean the A/F Ratio a bit, which in turn DOES add HP and lead to a bit better efficiency, which translates into a bit better MPG.

If the A/F ratio was the same, then you (and modshack) would be correct. You can't generate HP without increasing air AND fuel. Technically, we have too much fuel going in, which in effect causes us to lose power. The G3 intake is such that it lets more air in than the stock intake, and the positioning of the MAF sensor doesn't see the additional air flow (or as much of the improved air flow)...

Resulting in a leaning effect, which in turn does give a bit better efficency/MPG.


There's that's 2 ways to explain the same point!

Modshack

Welll....You're not "really" running rich under everyday partial throttle driving conditions. While the ECU is calibrated slightly rich, the O2 sensors, in concert with the MAF are constantly adjusting the fueling to maintain a stochiometric 14.7:1 ratio no matter what intake you have. This is Multiplicative adaptation otherwise known as long term fuel trims or closed loop. The sensors determine the Correction (injector duration) that needs to be applied to maintain the correct A/F ratio. The "Rich" 370 typically runs at -9 to -12% rich correction which means the fuel is dialed back to keep A/F's good. An efficient intake will result in lower numbers here but they are still "Corrections" with the desired goal of a Stochiometric A/F. The end result remains the same. These numbers (fuel trims) are easily read with a Scangauge or equivalent. When you go to WOT, you leave 02 fuel controls behind and go to pre-built fuel maps. These are typically a bit rich, but with the right intake you'll flow a bit more air to so it balances well. YOu're still using X amount of fuel, but with more air and a slightly leaner WOT mix you make more power. The real HP gains are made at high RPMS under WOT open loop conditions where More flow tells the MAF to deliver more fuel ...So technially, even though you are a bit leaner at WOT, you're really burning more fuel due to flow improvements read by the MAF. This is where the Dyno'd improvements are coming from. More air + more fuel + slightly leaner mix = more HP. Still no free lunch. Anyone who spends much tme with their foot in it can verify that.. You really have 2 distinct fuel usage profiles here. If you never step into it and make that transition from closed to open loop (determined by RPM, Engine load and throttle position) it should be a wash mileage wise, but you're not making any more HP in those ranges either.

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