SpeedPro Tuning

[Jörgen Karlsson]

>
> Wow... if you have 14% sweep during shifts and 250ms response time, wrong
> mixture correction in ALS and rev limiter situations and a closed-loop
> controller that oscillate up to a second (I'm not sure I understood
> correctly) I'd suggest not using closed loop WBO2 with this ECU
> for anything
> but dyno tuning.
>
> That said, a misfire will always read lean.

It is not a 250ms response time, it respond a lot quicker then that but
overshoots a bit. After 250ms everything is stable again. I still think that
they should work with it more, maybe there is an upgraded firmware.

The one second oscillation i was talking about requires pretty extreme
conditions to occur. By limiting the maximum correction to +-10% the problem
is almost gone.

All these problems can probably be minimized by changing the PID parameters
for the closed loop operation. But since the problems only can be reproduced
on the strip and the car is a bit sensitive we can't fool around with it.
Detonation is usually not a problem since we run water injection. If we
wanted to chase this problem we would have to start by producing detonation
and I don't feel that it would be a good idea ;)

Jörgen

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