No Device: HD/Delphi EFI Tuning Basics
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HD EFI Guru
Joined: Jan 2008
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So in regard to data skew, can we assume that one line in a log is going to have the MAP, current RPM, pulse width, CLI etc etc from one particular engine cycle ...or is that the problem? and just how big a problem might that be if for example there are 50 cycles per second at 6000rpm but only 14 lines in the log for that second? presumably the maximum skew would be about 3 or 4 cycles, or 80ms
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HD EFI Guru
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Since we are going to talk about CAN based product, how about you go make a log on your bike and post it up so we can review it and then it is something, anyone, can reference as we discuss things. I'm looking for the log not a graph of the data. As for the skew amount that all depends on what is being missed and part of that is engine speed related. The ECM when reprogrammed is capable of ~220 fps so this is NOT a buss speed issue on the CAN buss bikes.
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
Here's one for warm up, cold to EITMS kicking in, no throttle just idling, that you asked about earlier.
This is a 2014 CANbus 6 pin from a PV. Last auto tune of the VEs showed only 0,1 or 2s across the table. New map flashed to bike. 10 minute run. Total cool down. Warmup and log
Anything useful to show and tell?
PS it's not the smoothest idling Harley I've heard but it's not horrible and I'm still looking at timing
This is a 2014 CANbus 6 pin from a PV. Last auto tune of the VEs showed only 0,1 or 2s across the table. New map flashed to bike. 10 minute run. Total cool down. Warmup and log
Anything useful to show and tell?
PS it's not the smoothest idling Harley I've heard but it's not horrible and I'm still looking at timing
Last edited by Gordon61; Aug 5, 2016 at 06:18 AM.
Thread Starter
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HD EFI Guru
Joined: Jan 2008
Posts: 4,490
Likes: 4,776
Here's one for warm up, cold to EITMS kicking in, no throttle just idling, that you asked about earlier.
This is a 2014 CANbus 6 pin from a PV. Last auto tune of the VEs showed only 0,1 or 2s across the table. New map flashed to bike. 10 minute run. Total cool down. Warmup and log
Anything useful to show and tell?
PS it's not the smoothest idling Harley I've heard but it's not horrible and I'm still looking at timing
This is a 2014 CANbus 6 pin from a PV. Last auto tune of the VEs showed only 0,1 or 2s across the table. New map flashed to bike. 10 minute run. Total cool down. Warmup and log
Anything useful to show and tell?
PS it's not the smoothest idling Harley I've heard but it's not horrible and I'm still looking at timing
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
OK I have taken your data and pulled it into Excel. I dropped a few of the items out that were of no use and added a few columns in the beginning to keep track of time from startup. I've marked where it goes into Closed Loop and then mark a few other areas. Let's see if you can get an idea of why I marked these areas.
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
It looks as if it takes another few seconds before the O2 start switching properly ?? ...and they don't seem to switch all that quickly ??
(don't tell me my O2's are k'nacked when I swopped the exhaust
?)
(don't tell me my O2's are k'nacked when I swopped the exhaust
?)
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Thread Starter
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HD EFI Guru
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Look at the O2 voltage 524 - 528 then again at 532 - 534
Look at Integrator and Adaptive at 529, 530. Note how one is trying to Remove VE and the other Add VE at the same time.
Look at 13455 Front Integrator and Adaptive are both trying to reduce VE but Front O2 shows 0.06 volts which is dead lean!
13455 - 13485 Front O2 shows dead lean the whole time, that's over 2 seconds! Look at what the Integrator tries to do.
Now do you think averaging or using these data frames just might screw things up when tuning? You have to look at the data then get rid of the bad data First, then try tuning it.
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
(edit) is the CLI rising to 118% being manipulated by the EITMS strategy to richen the fuel?
I'll have another look at the rest of what you've pointed out over the weekend and hopefully others will join in with questions.
Have a good weekend
Last edited by Gordon61; Aug 5, 2016 at 05:53 PM.