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Old 03-09-2015, 12:52 AM   #1 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Question Air intake restriction, manifold vacuum, fuel flow

Could a more restrictive than OEM air intake, such as my current WAI, increase fuel flow by increasing intake manifold vacuum? A significant manifold vacuum increase could pull more fuel through the injectors, no? Would this then confuse the ECU which would know about the added fuel from the O2 sensor and respond by cutting fuel trim? The result could be very unstable idle and really erratic fuel trims changes, no? I could read the MAP sensor data with my scantool to see if the WAI is even increasing vacuum, no?

I am a journeyman/novice mechanic at best ... what am I not understanding about these systems?

See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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