1227165 Tuning Advice

[Bruce Plecan]

> | > 1.
> | > The nominal BLM is consistently below 128. Depending on the exact BLM
> | cell,
> | > the nominal value approaches 110. The integrator hovers around 128 +/-
5.
> | > Since the BLM is low and the integrator is OK, my guess is the fuel
> | pressure
> | > is high (44 PSI @ idle, 50+ PSI @ WOT). Is this a reasonable
diagnoses??
> |
> | Have you run any performance base lines?..  Fuel Pressure makes a ton of
> | difference at WOT..  Find out where your at with WOT AND cruise, then
judge
> | where you need to move things.  (Also, measure PW/Duty cycle).
>
> Why does fuel pressure make a ton of difference at WOT? The ecm should
> learn a correction for pressure while in closed loop that is applies to
> the open loop WOT.

Do you know that for a fact with your calibration?..
Is you calibration off by exactly the same amount closed loop to PE?.
There isn't any short cuts to doing it right,,,,,

 Changing fuel pressure would allow injects to flow
> more if needed, but the ecm should, over time, learn the correction
> factor for the pressure being used. yes?

If learn is enabled, for closed loop, yes.
 Bruce

> john
>