> So how is the boost controlled by the mfg? Is it with a fuel cutoff or
a
> ign retard or what? And what sets it off? Is it set off by excessive
boost?
> Is it knock sensors? Or is it a mechanical device?
Depends on the car (I've lost track of the thread's origin, so perhaps you
all were talking about a particular car). My own SVO Mustang has fuel
cutoff as a function of the rev limiter only; a knock sensor and ignition
retard to protect against detonation; but none of these function as boost
control per se. Nevertheless the engine management system is computer
controlled, as today's engines are.
Boost on the SVO is controlled as a function of a cooperation between a
simple integral mechanical wastegate (AiResearch T03 turbo) and an
electro-mechanical boost solenoid --- the latter of which simply allows one
to choose low boost or high boost (depending on available fuel octane).
Turbos being pretty simple torque enhancers, I would expect most turbocars
to be controlled by simple mechanical wastegates, integral or separate.
Richard Nichols
San Diego, CA USA
rnichol1@san.rr.com
86 Ford Mustang SVO (61B) - 1C
(The Thinking Man's Mustang)
72 Ford Pinto 2.0 (62B) - 3J
(Over Three Million Served)
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