Phoenix wrote: ↑Mon Apr 07, 2025 4:45 am
The only way that I'm aware of turning on lean cruise on the 7603 OS is through the patch. You can change all the settings in the lean cruise parameters, but it will not do anything unless the patch is used. If you figured out a different way of turning it on, would you mind sharing how and posting your tune file?
7603 has this option but it was disabled by speed (412km/h lean on)
So I decreased it to 50km/h and filled afr table (where gram kelvins and rpm) and ignition adder by AFR
And my AFR meter clearly shows that lean mode works
Sometimes even more than I want (at very light throttle sometimes PCM commands 18.7AFR but I only set it to 17 and I have no clue why it goes so lean cause it not allowed)
Phoenix wrote: ↑Mon Apr 07, 2025 4:45 am
The only way that I'm aware of turning on lean cruise on the 7603 OS is through the patch. You can change all the settings in the lean cruise parameters, but it will not do anything unless the patch is used. If you figured out a different way of turning it on, would you mind sharing how and posting your tune file?
7603 has this option but it was disabled by speed (412km/h lean on)
So I decreased it to 50km/h and filled afr table (where gram kelvins and rpm) and ignition adder by AFR
And my AFR meter clearly shows that lean mode works
Sometimes even more than I want (at very light throttle sometimes PCM commands 18.7AFR but I only set it to 17 and I have no clue why it goes so lean cause it not allowed)
Are you able to log commanded EQ Ratio or commanded AFR? That will tell you it the computer is actually entering lean cruise vs. a tune error or transient fuel error picked up by the wideband.
Im lazy btch and still not connected wideband output to logger (will do and relog)
I just saw target afr goes from 17 to 18.7 with no reason (all tables that I filled allows only 17) at light throttle and back to 17 if I press accel slightly more
Actually I think to use UP instead of HPT cuz it makes hidden adjustment in calibrations
I filled tables - and get 3 sec torque reduction instead of 0.2 sec
I reload previous and start filling one parameter by one and reprogram it to PCM
In the end I achieve same tables but no stupid 3 sec reduction
I go further and adjust several parameter that not related to torque model
And got this 3 sec back !
I reload previous parameters -and it still there ! But before it was problem free version
Looks like Im walking at the minefield with covered eyes
I have looked at disassembly, how lean cruise is triggered, Only way is through platform options[or forced with patch], there is no hidden settings and impossible to turn on without setting platform to some holden type, which lead to other problems[it may be also possible to p01 and not p59].
What you think of as lean cruise setting, might be something completely different and the main reason for your lean tips.
Do you know the hex address of that setting, I might trace it down.
kur4o wrote: ↑Wed Apr 09, 2025 6:36 pm
I have looked at disassembly, how lean cruise is triggered, Only way is through platform options[or forced with patch], there is no hidden settings and impossible to turn on without setting platform to some holden type, which lead to other problems[it may be also possible to p01 and not p59].
What you think of as lean cruise setting, might be something completely different and the main reason for your lean tips.
Do you know the hex address of that setting, I might trace it down.
ML van 2004 Astro van 7603 OS from factory
Dunno hex but if u can point me what to look up maybe I can find
antus wrote: ↑Wed Apr 09, 2025 1:44 pm
It sounds like it might be additional decel enleanment. There is always a reason, the hard part is figuring out what it is.
Loaded nearly oem calibrations without lean cruise
Still lean for 0.3-0.5 sec from 14.7 to 17 and back
I think it because of hardmod of my throttlebody
I deleted additional restrictor from it
*Image of oem one
You have now way too much inrush air, pcm can`t compensate with current settings, Needs faster reaction time.
You can start adjusting dynamic airflow coefficient, to find experimentally the one you need.
It is a MAF pump shot that smooth down rapid changes based on some zones. You need to decrease reaction time, based on rpm and map zone it happens.
Seriously, that is normal with most intake systems, 100kpa is not really practically achievable with any kind of intake at WOT, even high performance ones. If your map is accurate 96kpa would be considered good, which is not a huge gain.
