I just want to see if this makes sense to anyone...
I've been working on a tow tune for my LMM. So far I've gotten my timing and boost tables where I want them and have seen a significant reduction in DPF soot loading and fuel consumption, exactly what I'm after. All was going well until I decided to open the vanes at idle and close them at 0-5mm^3 and 2000+RPM for an exhaust brake. The exhaust brake worked very well, but my vane position was erratic elsewhere.
For example, sitting at idle it'd jump between 5% where I had it set and 30, 80, and even 100% with no apparent rhyme or reason. I then noticed driving around town my vanes were at 90% and I was running 4 PSI of boost. This was way more than it should have been. I looked through the tune and saw nowhere that that much boost or vane position should have been commanded. In fact, most of this erratic behavior was well above the max vane tables.
As an experiment, I built a new tune off my stock tune, changing only timing and desired boost tables. It now commands vane position just as would be suspected based on the vane pos tables and their multipliers.
The only things I did to cause the erratic vane positions was change the 300-800 RPM cells from 0-15mm^3 to 5% and the 2K+ RPM and 0-5mm^3 cells to 99.5%, and of course changed the max tables at 2K+ and 0-5mm^3. No other cells in the vane tables were touched.
Does this make any sense to anyone else? Is this a mystery feature of the 8594 OS, or am I missing something somewhere?
I've been working on a tow tune for my LMM. So far I've gotten my timing and boost tables where I want them and have seen a significant reduction in DPF soot loading and fuel consumption, exactly what I'm after. All was going well until I decided to open the vanes at idle and close them at 0-5mm^3 and 2000+RPM for an exhaust brake. The exhaust brake worked very well, but my vane position was erratic elsewhere.
For example, sitting at idle it'd jump between 5% where I had it set and 30, 80, and even 100% with no apparent rhyme or reason. I then noticed driving around town my vanes were at 90% and I was running 4 PSI of boost. This was way more than it should have been. I looked through the tune and saw nowhere that that much boost or vane position should have been commanded. In fact, most of this erratic behavior was well above the max vane tables.
As an experiment, I built a new tune off my stock tune, changing only timing and desired boost tables. It now commands vane position just as would be suspected based on the vane pos tables and their multipliers.
The only things I did to cause the erratic vane positions was change the 300-800 RPM cells from 0-15mm^3 to 5% and the 2K+ RPM and 0-5mm^3 cells to 99.5%, and of course changed the max tables at 2K+ and 0-5mm^3. No other cells in the vane tables were touched.
Does this make any sense to anyone else? Is this a mystery feature of the 8594 OS, or am I missing something somewhere?
