Boost is irrelevant... it's just the difference between the barometric pressure and the absolute manifold pressure. It does not appear anywhere in the ECU calibration, but the manifold absolute pressure (MAP) does appear everywhere.Dolfius wrote:Yes Bosch 3Bar MAP sensor. I didn't log MAP, but boost pressure and Baro pressure was logged- Boost+Baro=MAP as far as I understand it. So it can be a either or.
Ok, but do you have any idea what BARO does your sensors read? You alter the MAP limits only in those areas which correspond accurately to the barometric pressure in your area as reported by accurate weather devices but unless you are sure the sensors on your car see the same you should either work with MAP and MAP only, not boost, or also log BARO along with boost to get an idea where on the MAP tables you actually land.Dolfius wrote: But it didn't get anywhere near the boost limit of 22psi set. I know VT uses load tune logic, so looking at the log the load is also off from the 2.16 target set in the map. And this is my issue. In the one log, the load is pegged at 1.925 from around 4500rpm all the way to 6000rpm. Even though the map has WGDC to work with, and a 20% WGDC correction to work with, it still only gave spring pressure (because 0% WGDC) and didn't get to 2.0 load at all. Which is incorrect. The load at that flow should be at the very least 2.1.
Why is the load getting pegged at 1.925? What table am I missing that's preventing the load targets from being reached?
So why did load peg around 1.915 in that log? Hard to tell without a proper log... but with 0WGDC and all going at spring pressure it's clear that the ECU logic was pulling back WGDC, thus boost and power, to stay below some configured limits.
The load reported in that log though is correct. Load is proportional with the AIR flow, volumetric efficiency and 1/RPM, so in that case the air flow increased linearly with the RPM.