Looking for air/fuel meter

[Henry David Sommer]

robert dingli wrote
> 
> I've been given the go ahead to investigate and order a wide band
> AFR sensor and associated hardware for my research project at Uni.
> As far as I can tell the NTK sensor costing somewhere around $1000
> requires some basic control hardware for temperature control and
> that each sensor requires individual calibration.

	The NTK is the same as the NGK. NGK also owns the company that
makes the sensor that Horibia uses in thier 2,250$ system.  NGK has been
makeing sensors for the longest time and claims to have the best response
time and durability of any sensor.  The repeatabelity of any wide band
sensor should be better than anything you are measuring.

	The Bosch senor is ~250$ and doesn't claim to be as good as the
NGK but I don't know just what the diffrences are. The NGK maybe more
linear.

	Even if you are a good EE it is probably easier to buy a
calibrated system and sensor from someone like ECM than make your own. 
The difrence in price is less then the time you would spend working on it that
is for sure.

	I looked at about 5 or more systems and the two I put on the web
page were the only ones that were quoteing me below 2,000$ prices. 

	Does any one have sugestions for the best way to record the data?
I was planning to use the dynos data recording system but it only sample
once every .1 seconds at the fastsest and I didn't know if hat was good
enough. I'm going to start my testing with steady states and want to move
on to transiants from there.  The dyno I'm using is a SuperFlow 7100 with
a 286 doing the data recording.

	Mixing even more posts ECm also has a system to measure the
presure inside a cylender based on teh presure the sparkglug exters
against the head.  THey claim that it is acurate enough to detect knock
and ping for each individual cylender.

Henry Sommer | gt0035b at prism.gatech.edu | Georgia Institute of Technology
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