After the SAU Dyno Day at UAS, I noticed that boost was all over the place using the Autospeed boost controller.
Boost was bleeding off up top, but this is to be expected from a pneumatic boost control system.
I decided to see if I could get the curve to sit a bit flatter than what it was. After sourcing a wastegate actuator from an R32 GTS-T, which is, I believe spring rated to 10 PSI and is a direct fit we ran the car back on the Dyno to compare the difference.
Boost was sitting pretty flat though the Rev range but the dreaded bleed off was still present. I have plotted the result on a XLS spread sheet and created this chart. Hope this helps anyone who is thinking of performing this cheap and easy mode.
The part was picked up from SSS performance for $30 and was about 15-20 min to fit. I did have to reset the boost controller after the fit as boost was hitting 20 PSI with the original setting for the R33 wastegate actuator.
Sam
Yellow is the R32 actuator
Red = R33