1227165 Tuning Advice

[Mark Romans]

Also with a stock chip, the ecm will add an amount of fuel to WOT that it
adds to part throttle, if however it is pulling fuel out, it will revert to
BL of 128 at WOT.
Mark
-----Original Message-----
From: Bruce Wilcox (EUS) <EUSBEW at am1.ericsson.se>
To: 'gmecm at efi332.eng.ohio-state.edu' <gmecm at efi332.eng.ohio-state.edu>
Date: Thursday, April 22, 1999 12:14 PM
Subject: RE: 1227165 Tuning Advice


>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
>