Originally Posted by chip-3door
The problem is that the VE of the engine is not fixed at a given RPM/Boost level anymore because it will also depend on the vanes, thats my objection.
Now obviously in theory the vanes should always do the same thing at any given rpm/boost level, but in reality i suspect that the different time to go up through the gears will result in a slightly different response at any given load site from the vanes, especially as they are not instantaneous to react.
However, If you measure exhaust back pressure then thats cool, you just need some sort of feedback in terms of what the vanes are doing so you can use that to alter the fuelling, then you dont need an airflow meter signal, that was just one suggestion on how to react to the vanes.
Yes totally agree. The vanes would react much slower that what the electronics in the ecu/engine dynamics would. If there is a Exh gas back pressure input to the ecu, I would have thought regardless of vane position that the ecu would compare Intake manifold pressure VS Exh gas back pressure to give an indication of vane position (to a degree).
By knowing the approx vane position (hence Exh back pressure) VS engine rpm/manifold pressure I have no doubt that it is possible to tune. The amount of time taken though would be immense considering every possible scenario
Personally I’d prefer to stick to my “conventional” style of turbo too
