Power Vision Information Thread
Road Master
Joined: Aug 2014
Posts: 1,035
Likes: 39
From: Olive & Oak
Yep i tried both methods with editing the pvv files - they will load in LT ok but it still will not give the suggested calculations. it may have something to do with the names of the logged signals being different in PV2 vs PV1. I do know the table names changed in PV2 which is why the "fix" is needed on the pvv files to get them to load in LT.
The next best alternative would appear to be MegaLogViewer HD from EFI Analytics. it does load the PV2 log files just fine and you can set up multiple graphing display options, play back the log in a visual format, etc. for example I can have the graph display RPM vs MAP vs Spark Knock R and it will show me exactly where the events occur. there is apparently a way to use the scatter plot function to see lean areas but I'm still messing with it. FWIW
The next best alternative would appear to be MegaLogViewer HD from EFI Analytics. it does load the PV2 log files just fine and you can set up multiple graphing display options, play back the log in a visual format, etc. for example I can have the graph display RPM vs MAP vs Spark Knock R and it will show me exactly where the events occur. there is apparently a way to use the scatter plot function to see lean areas but I'm still messing with it. FWIW
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
Question- do any of you tuning experts know what the "Set Lambda" values in the PV2 log files are referring to?
Is this the ECM reporting what it "sees" as the lambda from the O2 sensor - or is it what is in the AFR table? Reason I ask is my log files show a leaner "Set Lambda" than is in my AFR table for a given MAP / RPM.
For example, reporting a Set Lambda of 0.999 at 101.86 MAP, 0 rpm (idle). my AFR table is set to 0.850 in the 100 MAP and 750~below area, so I might expect it to log 0.850? My VE Front is 92 and VE Rear is 99 for this area as well. Also saw some leaner Set Lambda values in the 70,80,90 MAP range than the AFR table would indicate for that specific MAP and RPM, even taking into consideration adjacent cell values.
I have NB sensors so not sure how the ECM would be able to report a Lambda value outside of Stoich. But these Set Lambda values are not coming from my AFR table either.
My entire AFR table is open loop so there is no fuel trimming going on - or is there?
Is this the ECM reporting what it "sees" as the lambda from the O2 sensor - or is it what is in the AFR table? Reason I ask is my log files show a leaner "Set Lambda" than is in my AFR table for a given MAP / RPM.
For example, reporting a Set Lambda of 0.999 at 101.86 MAP, 0 rpm (idle). my AFR table is set to 0.850 in the 100 MAP and 750~below area, so I might expect it to log 0.850? My VE Front is 92 and VE Rear is 99 for this area as well. Also saw some leaner Set Lambda values in the 70,80,90 MAP range than the AFR table would indicate for that specific MAP and RPM, even taking into consideration adjacent cell values.
I have NB sensors so not sure how the ECM would be able to report a Lambda value outside of Stoich. But these Set Lambda values are not coming from my AFR table either.
My entire AFR table is open loop so there is no fuel trimming going on - or is there?
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
Wow never heard of that one- I will definitely give it a shot- I just did that in LT and saw it change to "enabled" at the top of the menu.
Road Master
Joined: Aug 2014
Posts: 1,035
Likes: 39
From: Olive & Oak
Not a genius but dug that nugget out of this thread. A lot of good info here if you can find it and comprehend what you found.
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
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Outstanding HDF Member
Joined: Jun 2014
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From: 90210
interesting data in LT- but not overly helpful without LT PRO and WB sensors. Since my AFR table is OL, my VE and New VE logged values are the same. hence no suggested tuning changes. It does show some minor spark knock events but nothing worth tuning over- but nice to see LT actually working! With NB sensors this would appear to be more useful on AFR tables that run some CL.
No tuning entry for Actual AFR vs Desired AFR since that requires LT PRO- which is really what I wanted to see. This is still baffling me on where the "Set Lambda" logged data is coming from in the ECM and why it is different from the AFR table values.
So back to my original question- what is the "Set Lambda" logged data and why would it differ from the corresponding AFR cell values for a given MAP / RPM.
No tuning entry for Actual AFR vs Desired AFR since that requires LT PRO- which is really what I wanted to see. This is still baffling me on where the "Set Lambda" logged data is coming from in the ECM and why it is different from the AFR table values.
So back to my original question- what is the "Set Lambda" logged data and why would it differ from the corresponding AFR cell values for a given MAP / RPM.
Last edited by LA_Dog; May 18, 2015 at 07:40 PM.
