[Fliz]

Does anyone know how the geometry (vane position) of the turbo in our S cars changes with respect to RPMs?

For example, is there a certain RPM where the vanes shift position or do they continually adjust. And, is the position a factor of anything other than RPM? Like oil temperature etc.?

Thanks,
Fliz

 

[Andros X Thomson]

It depends on RPM and load demand.

 

[ZuffenHouseRules]

" Traditional VGT control systems utilize a boost map that correlates a desired boost level with a particular engine fuel delivery and engine speed. A boost sensor measures the boost level and adjusts vanes to increase or decrease the boost to match the boost map. "

https://www.google.com/patents/US6679057

 

[4802]

Does anyone know how the geometry (vane position) of the turbo in our S cars changes with respect to RPMs?

For example, is there a certain RPM where the vanes shift position or do they continually adjust. And, is the position a factor of anything other than RPM? Like oil temperature etc.?

Thanks,
Fliz

These articles might help :https://paultan.org/2006/08/16/how-does-variable-turbine-geometry-work/
https://blog.caranddriver.com/tech-...porsche-718-boxsters-turbocharged-flat-fours/

 

[Fliz]

Thanks for the refs folks!

I'm trying to understand how this all works to help figure out what could be causing some of the sounds I hear in my car. Seems like a tall order given how much is going on in these engines!