Sorry it's a long post really wanting to learn tuning a motor without a screwdriver and timing light.
Thanks for any feed back!
data logging and tuning
Moderator: mikel
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terrysheldon
- Posts: 9
- Joined: Wed Feb 24, 2010 9:23 pm
data logging and tuning
I have been data logging and was curious about how to use the knock retard info, on one when im in WOT was -3.0 and another one was +3.0, but the total remained at 0. The max retard was at +12? Is this offset normal? Is one of the knock retard values the main one to be at 0 and the others go up and down? If the positive number from adding time, or is the low one from adding time? I am sure I will be having a custome tune done but I am still wanting to learn more about making adjustments on my own when I need to. Living at 7k elevation is more difficult to have the canned tunes work to their max potential.
Sorry it's a long post really wanting to learn tuning a motor without a screwdriver and timing light.
Thanks for any feed back!
Sorry it's a long post really wanting to learn tuning a motor without a screwdriver and timing light.
Thanks for any feed back!
RE: data logging and tuning
The knock retard is how much the comptuer is retarding from the ideal calculated point based on the feedback of the knock sensor. Lets say you get a 3° retard and your actual timming is 12° BTDC (before 0); this means that the timming was 15° but the PCM retarded (made it happen latter) to 12°.
I also live at +7k ft above, and I think the Diablo is not working very well in WOT adjustments at high altitude; this means that the changes should get arround 100 KPa range, but WOT at this altitude would read arround 75 KPa so I thing it is not (or barely) adjusting in this range. I have pending to do a thread about that, but been traveling a lot lately an it will require a bunch of logs and custom tunes to accomplish.....
I also live at +7k ft above, and I think the Diablo is not working very well in WOT adjustments at high altitude; this means that the changes should get arround 100 KPa range, but WOT at this altitude would read arround 75 KPa so I thing it is not (or barely) adjusting in this range. I have pending to do a thread about that, but been traveling a lot lately an it will require a bunch of logs and custom tunes to accomplish.....