Originally Posted by
OzDuramax
SV8346, I don't know if this helps you or not, and I have the 2012 RG with the Bosch EDC16C39 ecu, but they still run the same turbo.
I have left the vane position tables stock but I am able to demand whatever boost I like and it follows it beautifully. The Bosch ecu has about 5 tables from memory. Desired boost table and then about 4 different limiters based on Baro, RPM etc, etc.
I played with vane position entering some silly values just to see what result I got, but it made no difference. From real world daily driving and data logging, the stock tune with approx 23psi boost passed about 180 g/s of air past the maf at 3000rpm. At 28psi, I see approx 215 g/s. At 30psi I see 220 g/s. At 35 psi I see 225 g/s. This is with stock inlet. Seems to me that with the stock inlet track and its sharp short turn radius entry into the front of the turbo, these turbo's flow really well up to about 28 psi, but there are diminishing returns after that. I run a 30 psi tune as my daily driver which netted me 222 rwhp (stock 140). Not a tow tune by any means as its pretty aggressive and smokey at high rpm but great as a my daily transport with heaps of low-mid range torque, its awesome.
I know my vehicle is from an earlier year and runs a different ECU, but I just thought it may assist with your diagnosis.
Cheers.
Craig