How can I use the stock o2 data to tune?
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Joined: Feb 2005
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Car: 1988 Chevy silverado K5
Engine: 350 bored .030, crane cams hyd bluprint l-79 cam 447 lift 272 dur, camel hump heads port and polished 1.94 1.50, afterburner headers and y pipe, holley 670 cfm tbi, holley projection dual plane manifold, accel high pressure fuel pump, 3 inch exhaust
Transmission: 700 r4 with corvette servo and shift kit.
How can I use the stock o2 data to tune?
What would be rich or lean... Generally what is stoich?
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Higher number means more air and fuel? Sorry for the newb questiong I'm still figuring this out.
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Higher number means more air and fuel? Sorry for the newb questiong I'm still figuring this out.
Last edited by Blazin4x4; Nov 11, 2006 at 11:03 PM. Reason: Automerged Doublepost
Joined: Jan 2005
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Generally speaking if it is low it is leaner than 14.7:1 and higher is richer. With my GM heated O2 sensor, I see 30-40 millivolts at a wideband verified 15.9:1 A/F ratio, 470 millivolts @ 14.7:1, and about 900 millivolts @ 12.5:1. This is by no means what you would see at the same ratios as every vehicle is diffferent.
Joined: Sep 2003
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
me and 87_TA did a scan run on my L98 that later was verified to be around 12.2 to 1 air/fuel. the scan run showed about 800-840 mv or so. i believe he said his car is running more in the 700's and is leaner than 12.2 to 1. but cars can differ
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