Originally Posted by chip-3door
You seriously need to think about how the ECU is going to know whats going on with the vanes.
Daft as it sounds, the R5 essentially is an airflow based system, cossie is only normally map and TPS
I dont see how map and TPS can really work with a VNT turbo in a high state of tune.
That is a good point.
The way I understand it, the variable vane position within the Exh housing will be governed by the Exh gas back pressure, agree? If so, then wouldn’t that mean that the pressure within the intake manifold would govern the Exh gas back pressure dependant on engine rpm?
I would have thought that it would be correct to say that by mapping the engine using a map sensor (rather than an airflow meter) would be more accurate considering the above?
In my opinion the most accurate method would be using TPS/MAP/Exh back pressure “mode”. The Autronic ecu range do offer this option in there software.
I’m interested in opinions as this is a discussion that I have yet to see/read on the net
