The Blazer was made legal so it can be driven on the street. The woman at the DMV couldn't understand, at first, why it hadn't been licensed since 2009...
I also got the brakes sorted out, so it's safe - for now. Then I took it out on the highway for a real test... I found that the Turbomaster is set to produce a max of 12-psi of boost pressure, and it'll stay there for as long as you're into the acc pedal. No codes popped up, so the programming must be OK with it. That may have been part of the problem with melted pistons... the GM-4 turbocharger really needs an intercooler when pushed to 12-psi (the GM-series of turbos are not that efficient past about 7-psi - the boosted air gets hotter), and combined with more fueling than stock. Runs great though. All of the gauges work correctly and there are no warning lights on the dash.
Turned out, the brake fluid reservoir was just low. After getting the Blazer operational, Sarah and I replaced the front brake pads due to them being worn to the point of needing replacement. We removed the rear drums, but didn't replace the shoes. I estimated the rear shoes being at 1/2 life.
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