Thanks a million! I'm not exaggerating, but I have searched for this video for months. I loved the way you explained the VNT mechanism. However, I missed one point: Once the car is ignited a vacuum is produced, and the vacuum makes the actuator pull the vnt rod, which narrows the air passages between the turbines and vanes. Like the fan example, when the airflow speed is low, you can pressurise it by blowing from a narrower space, hole, etc. From my understanding, airflow speed is maximum when the vanes are almost closed at low engine speed. Naturally, the vanes open more with increasing rpm, which allows for more air, thus a higher turbo boost pressure. Is that right?
I guess you get a green light for overall information, but since I was just here for a clearer how VNT turbos work portion I had to skip almost half your video... Otherwise it was great thanks...
I was wondering. Could the vanes of the VGT be made of ceramic? It would be light and extremely heat resistant and should be reliable as the vanes are not subject to mechanical stresses and pressures other than movement, i.e., opening and closing.
the steel turbocharger is powerful enough, the unit is already small and light, nowhere in engineering, even planes and rockets do not use ceramics. the answer is NO.
What I want know the vanes should be closed or open little bit I want adjust the screw in my turbo but I want know if stays open little bit or closed at all thank you
At low engine speed, the vanes are in the “closed” position narrowing the gap between them which accelerates the exhaust gas onto the turbine wheel. At high engine speed the vanes open up slowing the exhaust gases, which prevents the turbocharger over-boosting.
Thanks for that Tom. I have not long ago modified gtb2260v turbo (but not fitted yet) to run a mechanical actuator over the electronic item, I just wanted to make sure I have the actuator sat on the right side of the turbo to operate the veins to the correct position. Now I'm thinking I may have it wrong!
