VVT Vane position

[killerbee]

0% vs 100%

which is which?

1. when the vanes flatten to form a circle this is:

a. 0% ?
b. 100% ?

2. The maximum boost is found near:

a. 0%
b. 20%
c. 80%
d. 100%

[a78turbo]

The percentage is relative to velocity. The higher the percentage, the faster the velocity for spool-up to a point. 100% is almost blocking flow completely. This is where GM is commanding LLY/LBZ turbo's for exhaust brake feature on 06 medium duty trucks. 0% is almost no boost at all, or fully open. Hope this helps out some.

[killerbee]

Awesome, thanks! Makes more sense now.