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

[bcroe at juno.com]

I should have said this was in respect to the NTK sensor.  
I don't have practical experience with the Bosch, though 
it probably is not a quantum leap ahead.    

I don't know of any release of a calibration circuit for the 
NTK sensor.  But there were some equations leaked out.  
A circuit can be built to exactly follow an equation, even 
if it is different from the mfgs circuit.  That was done 
on the first DIY-WB, and the results seem to be pretty 
good.  But we don't officially have that equation.  As I 
have said, trying to squeeze another decimal place of 
absolute accuracy out of the ckt is a waste for engine 
tuners.  Much more important was wide dynamic range 
in the DIY-WB unit, for which fixes have been described.  

There was thought that an official NTK wide band unit 
might be available for testing.  This would allow determining 
the equation exactly, without even opening the unit.  Can you 
say, "reverse engineer"?  But this was never actually done.  

Bruce (experienced reverse engineer) Roe

23 Nov 2005 Peter Gargano <peter at techedge.com.au> writes:
> bcroe at juno.com wrote:
> >>when an OEM WBO2 sensor is replaced is the ECU recalibrated?
> > 
> > How would it be recalibrated?  The ECU accepts the accuracy the 
> > calibration resistor provides, which is good enough.  Bruce Roe
> 
> All the Bosch LSU sensors I've seen are laser trimmed. The Bosch 
> specifications for the sensor make it very clear how the sensor 
> calibration component is used to account for variation between 
> sensors, so it's not rocket science to create a circuit that will 
> work pretty well with the complete range of sensors that may 
> be plugged in.
> 
> On the other hand, the problem with the NTK sensors is that 
> Honda/NTK never (to the best of my knowledge) made the 
> calibration component's use public, and the cal part of DIY-WB 
> circuit was a reverse 
> engineering exercise with a bit of guess work.