DFCO qualifiers and the weird AE calc 12P

American Delco GM ECUs and PCMs, ALDL, OBD 1.5.
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DFCO qualifiers and the weird AE calc 12P

Postby 34blazer » Thu May 30, 2019 9:53 am

There's only a few qualifiers in 12P for DFCO. Is that all??? There's no RPM delta qualifier so DFCO is active in between shifts, which also leads to a lean tip in condition. Before I turn it off is there such a qualified that is not defined in the current xdf I have?


I'm also not liking the composite AE calculation, it's very crude at best. Was that derived from the original calibration? I really need a TPS based AE because right now this one size fits all logic needs to be rich in most places so that I don't have a lean tip in issue in between shifts or at initial take off. If I had TPS AE all I need to do is adjust the region between 20-30% delta.


Thanks
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Re: DFCO qualifiers and the weird AE calc 12P

Postby antus » Thu May 30, 2019 6:09 pm

I dont think DFCO should be active between shifts, can you post up a log?

The V8 12P data contains the factory data for an MPI Holden 5.0L V8. The offsets are injector milliseconds (quicker to calculate?) so if your running a different flow rate the values will be out. I guess its done this way because its a 2mhz 8 bit computer and its quick to calculate.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: DFCO qualifiers and the weird AE calc 12P

Postby 34blazer » Fri May 31, 2019 12:12 am

Sure is. I can watch the IPW drop to zero on a free rev. In other calibrations there was a max RPM delta to prevent DFCO from becoming active if the RPMs decreased to quick.
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Re: DFCO qualifiers and the weird AE calc 12P

Postby 34blazer » Fri May 31, 2019 12:12 am

....or at least a delay for the same reason
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Re: DFCO qualifiers and the weird AE calc 12P

Postby delcowizzid » Fri May 31, 2019 11:50 am

Dfco should only be active if between 1400 and 1500rpm and 19 and 29kpa and above 30kmh.it could be decel enleanment pulling fuel when you lift not actual fuel cut change the manfuel settings for decel enleanment or set the minimum de bpw to something higher than 0 that's in the bin so it can't fully cut fuel
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Re: DFCO qualifiers and the weird AE calc 12P

Postby 34blazer » Fri May 31, 2019 11:19 pm

delcowizzid wrote:Dfco should only be active if between 1400 and 1500rpm and 19 and 29kpa and above 30kmh.it could be decel enleanment pulling fuel when you lift not actual fuel cut change the manfuel settings for decel enleanment or set the minimum de bpw to something higher than 0 that's in the bin so it can't fully cut fuel



DW, I'm running a 2.0 Opel turbo engine. It doesn't pull as much vacuum as a 3800 or V8 so those settings have been changed to match the characteristics of that engine. What I'm asking is if there is a delay timer or delta rpm parameter, like what is found in other GM calibrations.
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