[Diy_efi] DIY WB as daily driver

[bcroe at juno.com]

The heater tends to draw less current as it gets hotter, 
partially compensating.  However this effect is not 100%, 
since the heater actually needs to BE hotter to decrease 
current.  A fancy system might actually measure resistance 
(applied voltage divided by current flowing) and continuously 
adjust power for the resistance representing the correct 
temperature.  Part of the problem is that not every sensor 
has the same resistance.

Bruce Roe

On Thu, 20 Jun 2002 08:27:38 -0500 "Hugh Keir" 
<hugh.keir at pathfinderlwd.com> writes:
> 
> I am planning to start an extended period of tuning and 
> have fitted two DIY - wideband lambdas using the standard 
> 3 wire Lambda bungs just behind the turbos on my car.
> 
> The exhaust gas temperature seen just after the sensor 
> is 700 C to 850 C when cruising and up to 950 deg C 
> ( 1750 deg F )for some occasional flat out stuff.
> 
> Bruce Roe said a couple of days ago that the DIY-WB 
> does not control the sensor temperature.
> 
> What kind of life expectancy can I expect from the 
> DIY-WB in the temperatures seen above? 

> Hugh Keir 


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