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What are you using for an air/fuel monitor?

Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
I'm looking at air/fuel monitors and have found that there are a LOT out there, including a few home-built, LED style units that look pretty easy to build. My brother has a Cyberdyne, while my son has something a little more exotic. Me? I just look at the plugs, but that's soon changing.

I was wondering, though, what those of you who have these monitors are using and what you think of them. I haven't yet decided between an analog (meter) style, or an LED style (which I'm leaning toward for ease of use with my tired eyes), and I suppose I'll go with a heated (3-wire) sensor.

I'm also wondering where you folks mount the 02 sensor - looks like the best place for me is in the collector of my header.

Comments, please!

Gordon
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Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
I'm looking at air/fuel monitors and have found that there are a LOT out there, including a few home-built, LED style units that look pretty easy to build. My brother has a Cyberdyne, while my son has something a little more exotic. Me? I just look at the plugs, but that's soon changing.

I was wondering, though, what those of you who have these monitors are using and what you think of them. I haven't yet decided between an analog (meter) style, or an LED style (which I'm leaning toward for ease of use with my tired eyes), and I suppose I'll go with a heated (3-wire) sensor.

I'm also wondering where you folks mount the 02 sensor - looks like the best place for me is in the collector of my header.

Comments, please!

Gordon
FM Former Member
I'm using norzdok (sp?) air and fuel ratio gauges in my turbocharged watercooled cars, summit racing carries them for about 30 dollars, the have the led vertical bar and go from lean at the bottom to rich on top, they are nice and accurate, I'm using bosh 3 wire heated O2 sensors and the best position is as close to the heads as possible but where gasses from all 4 cylinders meet so you will get an accurate average and not only a one cylinder reading (I guess the collector meets the criteria)

I'm planning to use a similar system in my soon to be turbo speedster
FM Former Member
You might conceder a wide band sensor. Narrow bands are inexpensive but only really indicate a 14.7 mix of air and fuel. You are either above, below or at 14.7, the limits of the sensor change with the exhaust gasses temperature. The wide bands are temperature compensated and have a much higher resolution and repeatability. You can accurately dial your motor into a 12.7 or whatever your hart desires. Of course they cost way more.
www.innovatemotorsports.com/products.php
FM Former Member
The LED units are only semi-accurate (ball park). A quality wide-bsnd A/F meter is expensive (uses a different O2 sensor, chip, etc.) and will read to 1/10 of an A/F ratio with practically instantaneous response. These noramlly have a selector switch for different fuels (e.g., propane, etc.).
FM Former Member
The LED units are only semi-accurate (ball park). A quality wide-bsnd A/F meter is expensive (uses a different O2 sensor, chip, etc.) and will read to 1/10 of an A/F ratio with practically instantaneous response. These noramlly have a selector switch for different fuels (e.g., propane, etc.).
Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
Thanks guys....all of this is good input.....I was leaning toward the LED unit for ease of use but was concerned with the accuracy (or lack thereof) and with something futuristic looking in an early looking cockpit.

Looks like my son has solved the problem for me with his wideband unit so now all I have to do is pony up for the upgraded sensor and I'll be all set. Remember, all I want to do is adjust my Dellorto carbs correctly and then I would be done (not being the kind to be forever tinkering with them once they're set) and I really don't need a little LED gizmo sitting on top of the dash asking to be looked at.

Happy in the Micro State......Gordon
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