new EE xdf

[steveo]

looks like EE hackers have all died, fell asleep, or given up long ago

for starters, i'm going to clean up, comment, categorize, and add some necessary stuff to the XDF for EE.

since half the damn bin is transmission parameters, putting them all into their own category makes browsing around the xdf much easier. i also seperated all the error code switches.

i've also added (obviously should be considered beta):

- blm locker as a patch (no more seperate exe)
- block learn mode and crankcase purge enable coolant temperature
- cl mode vs maf afgs, and O2 rich/lean threshold vs. cl mode. yes, you can now tune closed loop part throttle AFR with tunerpro, like tunercat guys have been doing for years

i hope someone finds it useful. i'll be adding more soon

http://resfilter.net/files/carstuff/EEX/EEX_1a.zip

[EagleMark]

I beleive all the DIY guys who had learned and shared through the early years had gone professional when OBDII came along, and with the LS PCM coming out in 1998 work on LT1 PCM had come to a standstill. Plus it was a lot harder to work with.

I organised and did as much as I could with the $EE but when the kid got T boned and totaled my test car it was the end of my involvement. Hard to do anything without a test vehicle... most of my work was getting the ADX to work!

An idea for building the xdf would be separate xdf for engine and trans? But then categories works so well when you put time into it as I have on many others.

One thing that was always missing and caused havoc with tuning the LT1 with long tube headers was INT vs Airflow delay when moving the O2 sensor...

Can't wait to open it up and see your work!

[EagleMark]

Can't wait to open it up and see your work!

Wow that is nice!

[steveo]

yeah, tell me about it. i have one o2 that's a clear foot futher down the track because of my headers. i'll always have splits. but i can dork around with them trying to tune around it, as the o2 switching mv are per-bank (can fake one bank richer/leaner, to a small extent)

let me know what you think about my categories, they're a bit unorthodox, i tried for groupings based on what you'd be tuning at the same time..

[Fast355]

I haven't touched a LT1 in years.

[steveo]

next update, it's a minor one, but added a few other necessary things

http://resfilter.net/files/carstuff/EEX/EEX_1b.zip

[EagleMark]

Whenever you are ready I can add them to the $EE information thread for hosting. With credits to you and links to threads of course.

[steveo]

go for it whenever

it's a moving target right now, and will continue to be until my car blows up. i'll release regular updates as i figure stuff out, to here:

http://resfilter.net/files/carstuff/EEX/

i'll try to submit it to the actual tunerpro crew once i have a good frozen release that's been tested out more

it has some weird rounding errors with stuff like the o2 rich/lean threshold, but it's definitely useable, it's just +/- 1mv

[steveo]

that o2 feature alone is a life saver too.. as i mentioned, i have one o2 that's basically going to always be colder than the other, because one is up near stock location, and the other is way the hell down the y-pipe.

i had closed-loop only part throttle imbalancesand a 'scope on a fresh pair of o2s showed that the voltage peak of the 'colder' sensor was about 50mv lower than the hot one at full operating temp.

all i had to do is richen the bank with the sensor further down, by increasing the rich/lean threshold of that sensor about 40mv. now my part throttle blm split is almost fixed, and infared reads even between the banks

thinking i might be able to fine tune it a lil' bit, it gives you a little bit of ability to tweak it per afgs too..

[EagleMark]

i'll try to submit it to the actual tunerpro crew once i have a good frozen release that's been tested out more

I'm not sure why Mark M at Tunerpro does not update the ADX and XDF files on the site? I stopped sending them a couple years ago when they never got posted.

Thanks for sharing your work! It's always great when someone else jumps in and helps us!

[EagleMark]

it has some weird rounding errors with stuff like the o2 rich/lean threshold, but it's definitely useable, it's just +/- 1mv

RobertIsaar is great at working them out. He's also heavily invloved in that era PCM for the V6 and another Northstar of that era so may have the correct conversions figured out.

[RobertISaar]

what now?

bad conversion factors?

i've NEVER run across that ever.....

[steveo]

i think there might be a somewhat predictable drop in mv per distance gained from head in the exhaust pipe, anyone ever calculated such a thing?

due to temperature difference, i lose almost 50mv from the peak output of a sensor that's approx 15 inches further from the head than the other, but part of that might be due resistance in the o2 extension..

or am i just blowing smoke

[steveo]

come to think of it, less mean voltage produced from a colder sensor would read richer, producing a leaner mixture, increasing exhaust temperature, which could heat the o2 more, increasing voltage ...

i'm not that good at math.

[1project2many]

Earliest cals had a time value for O2 lag. Later P4 cals were supposed to calculate that value. Understanding and adjusting that algo might do wonders for this issue.