Internal wastegate.
With a stock IX turbo it really doesn't matter that much because the IX turbos all seem to be characterized by severe boost taper issues. In my opinion, the taper is not a result of any deficiency of the stock actuator per se.
Well, if you think about it I guess you could argue that the taper is actuator related. But, I am not 100% convinced that an upgraded actuator would necessarily cure the taper under all circumstances.
I always thought that the IX turbo although it is configured with a more efficient compressor housing volute design in comparison to the VIII turbo which it superseded, might suffer from pressure ratio anomalies brought on by having slightly improved compressor flow due to the improved housing design while having retained the old compressor wheel along with the 16G's unimproved hotside.
I realize that my response is a bit off topic. But, as a practical matter if you aren't going to be running anymore than 23-24 PSI then you won't gain much by upgrading the actuator. On pump gas, especially on 91 octane, you won't really gain anything by going to an upgraded heavy duty actuator.
Now, if you are going to be running 25 PSI and above, then sure get an upgraded actuator. I am just not sure that the IX's taper issues can be totally solved by an actuator swap. I realize that you didn't even mention boost taper, but even so, you are going to have to deal with it if you run a IX turbo.
Well, if you think about it I guess you could argue that the taper is actuator related. But, I am not 100% convinced that an upgraded actuator would necessarily cure the taper under all circumstances.
I always thought that the IX turbo although it is configured with a more efficient compressor housing volute design in comparison to the VIII turbo which it superseded, might suffer from pressure ratio anomalies brought on by having slightly improved compressor flow due to the improved housing design while having retained the old compressor wheel along with the 16G's unimproved hotside.
I realize that my response is a bit off topic. But, as a practical matter if you aren't going to be running anymore than 23-24 PSI then you won't gain much by upgrading the actuator. On pump gas, especially on 91 octane, you won't really gain anything by going to an upgraded heavy duty actuator.
Now, if you are going to be running 25 PSI and above, then sure get an upgraded actuator. I am just not sure that the IX's taper issues can be totally solved by an actuator swap. I realize that you didn't even mention boost taper, but even so, you are going to have to deal with it if you run a IX turbo.