1227165 Tuning Advice

[jgwynne at mrcday.com]

| > 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. 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?

john