1227165 Tuning Advice

[Bruce Wilcox (EUS)]

Hi John,

I think the ECM is learning over time. The long term BLM is low (110) but
the short term integrator is around 128. I believe this indicates that the
ECM has compensated.

Bruce

> -----Original Message-----
> From:	jgwynne at mrcday.com [SMTP:jgwynne at mrcday.com]
> Sent:	Thursday, April 22, 1999 11:35 AM
> To:	gmecm at efi332.eng.ohio-state.edu
> Subject:	Re: 1227165 Tuning Advice 
> 
> 
> 
> | > 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