[Diy_efi] Re: [Efi332] Fw: wide-band O2 sensor comparison

[Andrew Brownsword]

Well in my case I think this will be sufficient... I'm converting airflow 
meters so I can use a commercial A/F meter (which I can borrow for short time) 
to get some baseline readings from the stock VAF, and then use that to 
calibrate the display I'm building to interpret the DIY-WB's voltage signal.  
The result I can then use to tune on the MAF I'm converting to.

I can see the argument that this isn't a precise device, but really is there 
any alternative for anything close to this amount of money?  The DIY-WB is 
going to be more useful than the typical HEGO-based gadget, and that's enough 
for a hobbiest like me.



Quoting Garfield Willis <garwillis at msn.com>:
> Nope. Yes, you could use a commercial meter to calibrate or check ANY
> other AFR meter, IF you had a way of correcting the calibration. Unless
> you wanted to write down the 'corrections' curve and use it as a 'double
> lookup table' (first the reading to AFR, then the correction to actual
> AFR). That's the first IF. Then, since each sensor is different from the
> next by about 15% (NTK's statement, not just mine, but the test data
> over a large lot confirms it), you would also need to do this
> recalibration for each and every individual sensor, AND whenever you
> replaced/swapped sensors. Believe me, it's alot easier to just get the
> circuit designed properly. Then you don't need TWO AFR meters to get one
> decent one. :)



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