Quote:
Originally Posted by all-motor_turbo
cutting boost does nothing for fuel usage because now all that is happening is less air coming in same amount of fuel as before when there was boost.
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First of all we have MAF sensors, so when there is less boost, less air is being drawn through the MAF sensor, resulting in less fuel. its xx.xx parts air to ONE PART fuel. If there is less air, there is less fuel. Which is why we see BOV's causing brief rich conditions. EDIT: forgot to mention that the ECU will also dump in extra fuel under heavier loads, which are not necessarily boost (air) dependent, also under high detonation same thing.
I think you guys need to go download cobb's accesstuner and look for yourself. Read the fuel tables, read the ignition tables, or, go read the opening post. There is basically no difference between the maps except for boost cut.
And mpg is dependant on MORE than just Manifold pressure and throttle position. Its a function of your RPM, your AFR's, ignition timing, load, and speed. Smaller things such as coefficient of drag, tire width, air temperature and pressure also factor in.
Basically under light loads the only way cobb's map can be called "economy" is by running zero target boost. You'll still see WG spring pressure however, you just won't see full boost, thus not needing full boost fueling, and using less fuel.