Individual Cylinder AF Adjust, was: NTK wb-sensor price

[Lasse Langwadt Christensen]

socrace at ameritech.net wrote:
> 
> At 09:29 PM 1/29/2002 +0100, Jorgen_Karlsson wrote:
> 
>  >Cylinder selective measurement is hard to implement because of other
>  >reasons, you will have to know the time it takes for the exhaust gas to
>  >reach the sensor and that is not a trivial task to find out.
> 
>     There's a couple of work-arounds for the "gas transport time" problem
> you mentioned.
>     One way is to mount 2 sensors in split manifolds (one in each
> manifold). This works well with sbc stock manifolds, for example. The
> passenger side manifold 8,4 pair fire 90 deg apart versus the 6,2 pair
> which are 270 deg apart, the other two pairs are both 180 deg apart. So,
> the 2 pulses the sensor sees that are closest together are cylinders 8 for
> the leading and 4 for the trailing. The pairs surrounding this one, 2,8 and
> 4,6 are both 180 deg, or twice the pulse width of the 8,4 pair, making it
> fairly easy to spot. With the right algo, you can watch this using a narrow
> band sensor.
>    Actually using this to control individual cylinders is still no picnic,
> of course!
> Bob D

maybe I'm missing something but wouldn't measuring the "gas transport
time" 
be as simple as running the engine, skip one injection event and measure 
how long it takes before the sensor shows lean? 
repeat for different rpms, cylinder, etc. 

-- Lasse 
----------------------------
- Lasse Langwadt Christensen
- Aalborg - Danmark

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