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I have version 2.5 and there is no vacuum tube from the compressor. Mine definitely has the two-position throttle switch, and while I at first noticed the sequential boost, I don't now. That could just be my activating the throttle faster. It's my understanding that the Ver 3s had sequential activation, which would likely involve a rheostat. That could mean you have a ver 3.
Someone wrote that the step-up from 2-5 lbs was to eliminate strain on the shaft from going from full stop to full speed all at once.
All the design elements of the system are well known, so I suspect someone with sufficient skills could replicate it using now available parts, though I don't know if it would be cost effective now. Maybe the Torqamp could be part of the system if someone could design a controller. All the other elements would seem to be simple. I see Torqamps advertised at $2500, and there's a mini version but I didn't see a price. They're 48 volts and I don't know if that would present any problems integrating with our 12-volt systems. The Torqamp site indicates cars are running them now with the batteries in the trunk, but I didn't see any examples in my brief visit. Could be they use a button on the steering wheel like the NOX guys do.
The system appeals to me because 5 lbs is all I would want to put in these engines. that and the cheap price and easy installation. I still think there would be a market for them if replacement parts were available. unless there's a patent issue or something like that.
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