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cr45 · 04-25-2018, 11:00 AM

Using my Ultra Gauge, I have taken some fuel flow rates at a selection of idle speeds.

Engine Fuel MAP
Speed Flow
(rpm) (G/hr) (psi)
750 0.14 3.8
1000 0.17 3.48
1250 0.21 3.34
1500 0.23 3.05
1750 0.29 3.19
2000 0.31 3.19

As my car has a MAP sensor with no MAF, the Ultra Gauge appears to assign a VE of 75% across the whole load/speed range and then calculates the air flow based on the manifold air density and this assumed VE. The fuel flow is then proportional to the air flow.

I am curious if any North American owners have measured idle fuel flows as their cars have a MAF sensor and thus the fuel numbers should be more accurate?

04-25-2018, 11:00 AM	#21 (permalink)
cr45 EcoModding Apprentice Join Date: Oct 2010 Location: ireland Posts: 102 Thanks: 8 Thanked 52 Times in 34 Posts	Using my Ultra Gauge, I have taken some fuel flow rates at a selection of idle speeds. Engine Fuel MAP Speed Flow (rpm) (G/hr) (psi) 750 0.14 3.8 1000 0.17 3.48 1250 0.21 3.34 1500 0.23 3.05 1750 0.29 3.19 2000 0.31 3.19 As my car has a MAP sensor with no MAF, the Ultra Gauge appears to assign a VE of 75% across the whole load/speed range and then calculates the air flow based on the manifold air density and this assumed VE. The fuel flow is then proportional to the air flow. I am curious if any North American owners have measured idle fuel flows as their cars have a MAF sensor and thus the fuel numbers should be more accurate? Last edited by cr45; 04-25-2018 at 11:06 AM..