Actually Dave, the wastegate will still open regardless of the tuning.....but only because drive pressure overcomes spring pressure in the actuator. I tuned the heck out of my friend's 99.5 6-speed but couldn't get decent boost at low RPM (what I knew it was capable of). I never had an issue with automatics, but since manuals lose boost at every shift, I knew something was fishy. So I adjusted the wastegate rod until it was physically impossible for the wastegate to ever open and now the driveability of his 6-speed is GREAT. Of course I had to take some fuel out down low afterwards but it's a totally different truck now. I wouldn't recommend doing it to another truck, but I'm just throwing it out there because I know that the springs in the actuators are pretty weak and that they will be overcome by drive pressure at relatively low boost regardless of whether or not the wastegate solenoid is commanded to send boost to the actuator or not.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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