those sequential turbo systems are quite complex, too complex for Amateurs i think.
Even AMS changed back in the very last minute to single turbo on their 4G63-demo-motor for a big motor-buildup-competition sponsored by some oil company. The big problem was to make the changeover smooth, thats very hard to realize. Despite that AMS won the competition.
Proffessionally done those sequential setups can be wonderful, look at rx7 FD, supra mk4, Volkswagen 1,4TFSI (compressor and turbo), BMW 123d, Merced C250CDI....
Even AMS changed back in the very last minute to single turbo on their 4G63-demo-motor for a big motor-buildup-competition sponsored by some oil company. The big problem was to make the changeover smooth, thats very hard to realize. Despite that AMS won the competition.
Proffessionally done those sequential setups can be wonderful, look at rx7 FD, supra mk4, Volkswagen 1,4TFSI (compressor and turbo), BMW 123d, Merced C250CDI....