I'm going to be using a narrow-band O2 sensor as a A/F meter.

But it seems that you need to know the exhaust temp to use a narrow band

http://teamzr1.com/o2volt.htm
http://www.innovatemotorsports.com/resources/news3.php


So anybody know the typical EGTs for cruise and WOT?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Now matter how you look at it, you will never be able to use a narrow band sensor to accurately determine your air/fuel ratio. No matter what you read or what anyone might tell you... The only way is to use a good wide band setup and mount it correctly. Seriously, this has been discussed every which way you can imagine. Get a good wide band and follow the mounting the recommended by the manufacturer. Also, a wide band is really only accurate at or near WOT. Part throttle does not put enough heat into a wide band. On computer cars, we look at the HEGO switching to determine the correct A/F calibration. Also of note is all wide bands are affected by relative barometric pressure and unless you correct for this, your calculations will be off.

Mitch

Will you buy a wideband for me?


I already have a narrowband, and a digital voltmeter, so I'm at 'something's better than nothing'.............

Can't afford a wideband at the moment.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Mitch,

I just bought the NGK Powerdex and put the bung in this weekend. Ready to test, but your note briings me up short..what is wide open?

Is it the max I ever plan to be running regularly, as 4,000 rpm, or is it the (for me) momentary max rpm I might be brave enough to dial up under the hood by turning the throttle adjustment screw wide open?

rock
'64d100

WOT - your wide band will loose accuracy at anything less than wide open throttle or near WOT/heavy load. Engine load is the critical factor, not engine speed. I will see if I can find the pressure compensation chart -I should have it on my home PC.

Mitch

Oh,

Well I sure didn't know that Mitch. Sounds as if you are saying WOT is a term used for an engine say, at highway cruise, when you decide to stomp down and reducing vac to near or at zero. Easy enough to arrange but I would never have thougt to do it without you reply.

Thanks
rock
'64d100

Wide open throttle means balls to the mat. Put your foot to the floor and you are at wide open throttle.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.