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redpoint5 · 10-18-2018, 06:07 PM

My Acura has a MAP sensor. Is one inherently better/worse than the other?

If I understand correctly, the ECU doesn't know what the AFR actually is, it just knows how much O2 is going unburned, and adjusts fuel to target stoich, so it doesn't really care if it's ethanol or gasoline.

I've never seen my car go more than 40 degrees advance, so I'm not sure if there is any benefit by going more advanced than that, or of the car is even capable to do it. Of course, the car could tolerate more advanced timing under load with higher octane, but I'm not sure that's much of a benefit considering most of the time is spent cruising, not accelerating.

All that said, Nothing over E10 is readily available in Oregon. I just found a pump with E0 premium (92 PON), but it's $1.20 more expensive than regular 87. I might try blending with regular (E10) to see how it affects MPG.

10-18-2018, 06:07 PM	#17 (permalink)
redpoint5 Human Environmentalist Join Date: Aug 2010 Location: Oregon Posts: 12,854 Acura TSX - '06 Acura TSX 90 day: 24.19 mpg (US) Lafawnda - CBR600 - '01 Honda CBR600 F4i 90 day: 47.32 mpg (US) Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base 90 day: 21.82 mpg (US) Chevy ZR-2 - '03 Chevrolet S10 ZR2 90 day: 17.14 mpg (US) Model Y - '24 Tesla Y LR AWD Pacifica Hybrid - '21 Chrysler Pacifica Hybrid 90 day: 43.3 mpg (US) Thanks: 4,336 Thanked 4,490 Times in 3,453 Posts	My Acura has a MAP sensor. Is one inherently better/worse than the other? If I understand correctly, the ECU doesn't know what the AFR actually is, it just knows how much O2 is going unburned, and adjusts fuel to target stoich, so it doesn't really care if it's ethanol or gasoline. I've never seen my car go more than 40 degrees advance, so I'm not sure if there is any benefit by going more advanced than that, or of the car is even capable to do it. Of course, the car could tolerate more advanced timing under load with higher octane, but I'm not sure that's much of a benefit considering most of the time is spent cruising, not accelerating. All that said, Nothing over E10 is readily available in Oregon. I just found a pump with E0 premium (92 PON), but it's $1.20 more expensive than regular 87. I might try blending with regular (E10) to see how it affects MPG. __________________ Gas and Electric Vehicle Cost of Ownership Calculator Give me absolute safety, or give me death!