[Wbo2] Using the Bosch WB sensor with L1H1 circuit board

[James Holland]

----- Original Message ----- 
From: <bcroe at juno.com>
To: <bcroe at lucent.com>
Cc: <wbo2 at diy-efi.org>
Sent: Sunday, November 13, 2005 7:12 AM
Subject: [Wbo2] Using the Bosch WB sensor with L1H1 circuit board


> The purpose of a meter affects everything.  The emissions people
> could care less about transient performance, power, etc.  They
> just want to see that the total accumulated emissions is under
> their limit.  They may be sticky about absolute numbers.
>
> You on the other hand, are very interested in throttle response,
> and power.  Consistancy is much more important than absolute
> accuracy.  The best way to display this info will also vary.
>
> No, the sensors are not highly precise devices.  To get that,
> each sensor will need to be individually calibrated.  Tuners
> really don't care.  If a certain reading is best power, it is best
> power for you.  It really doesn't matter it it's 12.7:1 or 13:1, as
> long as it always reads the same.  What all meters (and display
> devices) should agree on, is S or Lambda.  That is a null
> point, and error should be relative to that.
>
> Transient response is limited by the sensor.  Getting electronics
> to keep up is pretty trivial, and easy to verify.  Digital display
> devices are worthless in this respect, but a graph or logging
> (another graph) will handle it.  The speed, direction, and
> approximate amplitude are a whole lot more important than
> the number of decimal places.  This was a weak spot on the
> original DIY-WB, but I found a fix for that.  There were also
> problems with the heater circuit, but those could be fixed too.
>
> Certainly reading plugs, etc are still valuable.  There was even
> a transparent plug to observe flame color, perhaps upgraded
> now with fiber optics.
>
> Bruce Roe
>
> 12 Nov 2005 Ron Vinsant <ron at poweracumen.com> writes:
>



Fair, comment, one point that puzzles ,e is the need to calibrate each 
individual sensor. Is it the sensor that needs to be calibrated or the 
meter? If it is the sensor then what is the purpose of the calibration 
resistor? when an OEM WBO2 sensor is replaced is the ECU recalibrated?

Cheers
James