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The twin turbos are a sequential affair. One for low end, the other for
high end. They are not intended to be both providing large amounts of boost
simultanously. I do not know of any fliers who used twin turbos.
Just a minor
nit to pick. The FD sequential twins do both provide boost
simultaneously. The primary comes in as early as possible, and the
secondary joins it later. Basically, it's like having a small turbo for
quick spool up on the low end, then the two small turbos essentially become one
larger turbo at higher rpm. There's a nightmare
of valves, solenoids, and hoses that make this happen, but when it
works, it's a beautiful thing for a street machine :-)
FWIW, I'm
100% in agreement that you don't want twin turbos on an aircraft unless the
engine is so big that it's your only option for the amount of boost you
want to run. I also agree that the stock turbo is not properly sized for
aircraft use.
Cheers,
Rusty (I miss
my FD, but I'd be in jail if I still had it...)
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