Nothing can prevent overboost with the actuator line off as long as the rod is connected to the wastegate arm to keep it shut and as long as the turbo spins freely. Only takes a half second for a mitsu to bring the boost up far enough to hit OBS.
When I first put a 2.5/t03 in the omni and got it running I'd just finished putting the FMIC on when it dawned on me I could take out for a spin. Forgot all about running a line to the actuator. Surprised I didnt break anything! Did blow the head gasket.
Thats good to hear. Didn't trick the computer or anything and it was the stock T1 smec so I guess it worked as it should. Omni has a wiring issue of the fan not kicking on even w/ CTS unplugged so I let it warm to 165 before I got in it. Head gasket was probably on its last leg anyway.
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