88IROCs

Check out this AFR gauge from New England Dyno Tuning <a href="https://www.safety-page.com/nedt/store.htm">-->HERE&lt;--</a>. The idea is a good one - using a digital readout to show exact milivolts output of the O2 sensor vs a vague reading from a sweep gauge or segmented LED's. However their advice for using the gauge(check the table at the bottom of their page) is laughable. Wonder if they use this table to tune customer cars?

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"The reasonable man adapts himself to the world.
The unreasonable one persists in trying to adapt the world to himself.
Therefore all progress depends on the unreasonable man"
--George Bernard Shaw.

[This message has been edited by 88IROCs (edited August 14, 2001).]

R.O.B.

Yea, cause isn't 14.7 optimal? Occording to thier chart, that would be "dangerously lean".

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Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.
48psi regulator, (Nickel method)

afgun

I'm assuming that's for power / wot mode. Still unreliable for a factory O2, as placement, variations in make etc... make everything except the tuned crossing point a crap shoot.

88IROCs

R.O.B.

14.7:1(stochiometric) is optimal only from an efficiency perspective. That ratio is typically when the engine will achieve it's most complete combustion(helpful for passing emissions, but not much else).
Best safe WOT power usually occurs between Rich Best Torque(max fuel before torque decreases - usually around 11.5:1) and Lean Best Torque(min spark before torque decreases - usually around 13.2:1).

'Course to use this info you would need a lot of dyno time(to tune fuel and spark at every set point - our ECM's increment at 400 rpm intervals), and an O2 sensor that can accurately measure down to 11.5 - 12:1(oem sensors are only accurate between 14.2 - 15.2:1 and do not respond in a linear manner if output is < 0.2 or > 0.8 VDC).

rudys119

as far as the product itself do u think it would be worth it to spend the money on somethin like that? i was thinkin that would be pretty sweet to put that up in my overhead console where i have my big ugly hole from where i took out my roller gauge things

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87 GTA 350 TPI
Mods: K&N Air Filter, New rocker arms, Stage III chip.
Next Mods in line: Exhaust, headers
http://www.geocities.com/rudys120/transam.html
Kills:
Nissa 300zx (dont think it was turbo)
87 Mustang 5.0,
89 Mustang 5.0 (modded)
?? Iroc
00-01? Jaguar driven buy 85 yr old guy
Too many ricers to count......