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A alternator on the drive shaft type setup could act as regenerative breaking... while driving it would not charge then as soon as you hit the breaks the 12v from the break light wiring trips a relay and the alternator is energized and connects to the electrical system and starts charging, most "GM one wire" alternators have a plug on them that can be used to control the charging of the alternator , for external regulator use..
I don't know how much breaking you'd get out of a standard high output alternator, but if its capturing wasted energy its a good idea.. however I know that you can make a gas powered alternator based charger from a 5 hp lawn mower type motor.. so they do take 5hp to turn the alternator at 5000 rpm..
realize that when your motor is running at 2k the alternator is at about 5k... so at red line of 6k its probably spinning at 10+k rpm.. so the exhaust mounted turbo may be a great idea... it would add some back pressure to the exhaust also.
If some one had a spare turbo laying around this probably would not be to hard to test out. couple the shaft from the turbo compression side to the alternator run some compressed air through it.. see what happens
Happy modding!
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