Anyone still having off-boost SD stutter issues?
#1
Anyone still having off-boost SD stutter issues?
Hey Folks, I guess its been a few years now since I came up with some possible patches to try to fix the SD stutter issue that people were having during off-boost driving. I haven't seen much discussion of the stutter issue in the ECUFlash forum recently so does that mean that the patches fix the issue?
#2
I have not had any, but it would be nice for some of the viii sd roms to be cleaned up, like the 2 step not working on some and nls.
I know your the man with this stuff.
I know your the man with this stuff.
#7
Evolving Member
My friend has some issues but it's partially stutter issues and stalling out while taking off. I believe the stalling I can fix with the asynch vs tps. Just gotta play with it to find the good setting.
MrFred, I haven't messed with the fixes to see what one does what. Have you declared what setting fixes which issue? When I went to go tune SD, I found myself guessing on the fixes.
MrFred, I haven't messed with the fixes to see what one does what. Have you declared what setting fixes which issue? When I went to go tune SD, I found myself guessing on the fixes.
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#8
Have you seen the three fixes that I wrote? They are simple 1D table patches. The first two should nominally address the same issue while the third fix addresses a different potential issue. The reason that I started this thread is because I am looking at a fourth potential fix, but it requires a brand new SD patch rather than something that can be added onto the existing patch.
#10
Evolving Member
Have you seen the three fixes that I wrote? They are simple 1D table patches. The first two should nominally address the same issue while the third fix addresses a different potential issue. The reason that I started this thread is because I am looking at a fourth potential fix, but it requires a brand new SD patch rather than something that can be added onto the existing patch.
As for the new one, what you got in the bag? Or is it a secret? If it has to be a brand new SD patch, you're looking at re-writing the whole SD script, right? Wouldn't work with the SD 2.0 3D maps?
#11
Actually no I haven't. I'm going off the ones provided in V7. I will look into your patch.
As for the new one, what you got in the bag? Or is it a secret? If it has to be a brand new SD patch, you're looking at re-writing the whole SD script, right? Wouldn't work with the SD 2.0 3D maps?
As for the new one, what you got in the bag? Or is it a secret? If it has to be a brand new SD patch, you're looking at re-writing the whole SD script, right? Wouldn't work with the SD 2.0 3D maps?
#13
Evolved Member
iTrader: (2)
mrfred,
I'm going off of my memory here, but I remember I was one of the first to notice and show logs of this when I went to SD.
I could have sworn that one of your fixes eliminated the issue, at least on the 9653 rom. However, this is at least a few years back now, as I switched off of SD because of the minor annoyance of heat soak of the sensor for startups.
Eric
I'm going off of my memory here, but I remember I was one of the first to notice and show logs of this when I went to SD.
I could have sworn that one of your fixes eliminated the issue, at least on the 9653 rom. However, this is at least a few years back now, as I switched off of SD because of the minor annoyance of heat soak of the sensor for startups.
Eric
#14
Eric, yes, it was your posts that got me going on the stutter fix. I thought I had covered all the possible contingencies as well, but there have been reports of it since then. Perhaps some people are not aware of the fixes? Or perhaps its just poor tuning? Or maybe there is more to it?
At any rate, a fourth possible fix does exist, and that is to insert the SD master load in the exact spot where the baseline MAF master load calc is completed. Three additional calculations would be performed on the SD master load if I put it here:
1) There are two algorithms that alter the master load calculation to help deal with abnormal spikes in load or perhaps fault conditions. They are not averaging routines but rather limits on how much the master load can change under certain conditions.
2) The SD master load would be run through the master load running average algorithm.
I think that John Banks would say that in his experience, this is not not necessary and may be why he didn't do it, however, I see value in placing it before the master load running average algorithm.
At any rate, a fourth possible fix does exist, and that is to insert the SD master load in the exact spot where the baseline MAF master load calc is completed. Three additional calculations would be performed on the SD master load if I put it here:
1) There are two algorithms that alter the master load calculation to help deal with abnormal spikes in load or perhaps fault conditions. They are not averaging routines but rather limits on how much the master load can change under certain conditions.
2) The SD master load would be run through the master load running average algorithm.
I think that John Banks would say that in his experience, this is not not necessary and may be why he didn't do it, however, I see value in placing it before the master load running average algorithm.
Last edited by mrfred; Aug 5, 2013 at 10:56 AM.
#15
Evolved Member
iTrader: (2)
Makes sense and I do remember John mentioning something along those lines and not needing it, due to his experience on his ROM. But perhaps to cover all ROMs, your new method would be the best approach.
So back to your original question starting the thread - see if people still have the issue with the previous fixes.
So back to your original question starting the thread - see if people still have the issue with the previous fixes.