What you care is plotting manifold vacuum, not the position of the throttle plate.
Originally Posted by Ares
I had done similar experiments on other cars and by removing snorkel and/or filter was able to figure out what intake updates are worth doing. For example on Prius C manifold vacuum is 1.2-1.6psi and removing filter reduced it by 0.6psi and snorkel was inconsequential. K&N replacement filter gave half ~0.3psi, so the improvement ~2%.
The biggest difference that Prius ECU most of the time runs engine with low manifold vacuum, so 2% decrease in pumping losses will have affect across the board. On Mirage it will only have effect in high demand situations, so MPG gains will be very minimal.
If you disconnect hose attached to airbox, you can figure out what is the delta, and the cold injection cone filter would likely have 0.2-0.3psi drop, so we can figure out what is the difference btw stock intake with OEM vs stock intake with K&N vs cold intake.
Last edited by cyclopathic; 01-15-2016 at 05:21 PM.
View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)