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

[Axel Rietschin]

----- Original Message -----
From: <socrace at ameritech.net>
To: <diy_efi at diy-efi.org>; <diy_efi at diy-efi.org>
Sent: Wednesday, February 06, 2002 19:09
Subject: Re: Individual Cylinder AF Adjust, was: NTK wb-sensor price


> Yes, "same cylinder" variations happen alot less often than "cylinder to
> cylinder" variations, so it seems reasonable they would need a much slower
> loop response to average them out. This seems to track with what I've
seen.
> When tuning a single cylinder (actually a pair of cylinders on a v8), I've
> haven't been able to do much better than about .2 percent mixture change
> per second max, with .1 being more realistic. Any faster and the loop
> starts oscillating. Is that about the timing you saw? And while your doing
> this, of course, the main loop can't be any faster either (I think this is
> right?) so things really bog down. Using this method, it takes nearly a
> full minute to move the mixture from the average level to individual
level,
> while nothing else changes during that time.

Yes I saw oscillations however I don't remember the pulse change rate at
which it begans but it was probably much more than in your example. Port
injection (i.e. little fuel transport time) and (open valve) injection phase
at low rpm might have something to do with that.

--axel


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