Bruce Nunnally Posted June 28, 2022 Report Share Posted June 28, 2022 This tune had a couple of fixes to try to eliminate the torque management advance. They were partially successful. Previous run showed two spikes with up to 12 degrees of torque management advance; this run had one spike with only 4.2 degrees. Although there is still some TMA, this was progress. I have been showing the graphs as xy graphs, hp to rpm for example, which is the way a dyno might show similar data. However, this does not consider the time aspect — it takes much less time for the engine to get to 4500 rpm than from 4500 to 6500 for example. This shows time offset from hptuners scan along the X axis instead of RPM. My impression is that they are time in seconds of the scan. It is time correct, and RPM builds from left to right but I have not discerned a best way to show both the HP vs RPM and HP vs TIME on one chart yet. This second chart is useful however for understanding when events occur in time — go WOT, tip-in and boost, torque, and RPM build rapidly. A largely flat torque curve that matches the boost curve. The remaining TMA retard appears to coincide with rapid boost development. My next test will be to see if that is a limiter. View the full article Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted June 29, 2022 Author Report Share Posted June 29, 2022 I have made progress in reducing the torque management advance (TMA) by RPM Limit Accel Thresh vs. Accel. However, there is still some TMA remaining. I suspect there were multiple sources for the TMA — we solved one. My next hypothesis is that there is some torque management advance coming from boost rate of increase exceeding the allowed pressure delta. https://www.caddyinfo.com/wordpress/torque-management-advance-to-pressure-delta/ Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted June 29, 2022 Author Report Share Posted June 29, 2022 For today’s test I increased the pressure delta. One test (pictured) had no TMA at all (yay) Read more: https://www.caddyinfo.com/wordpress/torque-management-advance-one-more-source-slain/ Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted July 2, 2022 Author Report Share Posted July 2, 2022 New sparkplugs, first scan to confirm I put it all back together correctly lol https://www.caddyinfo.com/wordpress/scan-e3b-new-plugs-no-tma/ Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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