MAYBE, it could be set on a relay with a tach with a shift light. set the shift light to come on at the rpm you want the blower to kick out, and when it comes on, it triggers the relay to cut the blower. that way, if you blow a boot, or shell the turbo, the blower wont come back on until youre below the set rpm. just a thought.
EDIT: come to think of it, 85 and later trucks with a manual tranny and the tach option came with shift lights in the top left little light box on the cluster. its amber and says "shift" and perhaps could be adjusted to the rpm you want? i dunno.
Thats an idea, i thought about it, but couldnt come up with a way to make it work off of rpms. I did grab my engine out of an 89, but i dont recall any shift light, and my dads 92 doesnt either. As far as i knew, that was a 90s chevy thing. The one benefit to it running off of boost, is no matter what rpm youre at, you always have boost, say the blower is set to kick out at 2200 and youre just cruising at 1800, you either have to down shift, or wait for the turbo to spool.
I did however come up with an alternate idea.
Mount TWO blowers on there, both 90* to each bank and run them with less overdrive, so instead of working 1 so hard and having to have it kick out to keep from overspeeding, have both of them able to turn 12k with the engine at 4400, at the same time, run electric clutches off of boost and no problem. Slightly more parasitic loss at lower rpms, but i would think a cooler air charge compared to the amount of air flowed, and moving more air. But with a potential of drawing 80hp off the fan belt, i think one would need a dedicated 8 rib belt for the super chargers.
One thing for certain, this setup will definately produce enough air. Im going to look up that cfm calculator that was posted and do some playing around. Im thinking 15+ lbs are attainable with 2 m92s. Then a turbo behind them making 35+.
Next question, can the turbo blow through the blowers if they are not turning? Even if it could im seeing it as alot of restriction. Running the turbo to bypass the blowers would require some sort 1-valve to keep from trying to spin the tubo the wrong way and losing boost inside the intake pipes. Disconecting the blower(s) might not be an option period when running a turbo with it. With the bypass setup would need at least two 1 way valves, and the way i have it laid out in my mind, 3 would make it alot easier. Also, my intention of killing the blowers is to free up the horsepower in the top end, roughly 80hp, but with a turbo blowing through them, and them theoretically not having to do anything except turn, i wonder just how much they would draw off the engine anyway, might be able to completely remove the whole blower disconect from the equation.
I know this all sounds pretty far fetched, but with the cost involved (more like the lack of) im really thinking about throwing something like this together, so if you all dont mind, im going to use you guys as my own personal think tank. On the matter of cost, the only thing this would add would be materials for brackets, charge pipe to tie into turbo pipe, a dual cold air instead of single, and the blowers themselves. Oh and lots and lots of time, which i see as a bonus, because i have time to kill. I must say, image of the layout in my mind is pretty epic.