Guys don't even bother to look if its not making boost . On a much larger turbo's (more mainstream) they generally "idle" at like 20k rpm and under full boost go to 100k .
I don't know on the Cruze but since its smaller, closer to valve exit and very responsive the idle speeds could be higher .
Don't shut engine off and let it cool down if you were pushing on it .
Don't know if there still around but there were add in electric pumps to prime and run after engine shutdown, along with bunch of turbo timers which just don't let engine turn off till xx time after key is pulled .
Never used the add-in pumps but they supposedly worked .
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