All you need for throttle reduction (and fuel cutoff works almost as
well) is the spring loaded system MB used in the W126. Mehcanical
throttle with a servo that can push it shut against a sprung rod,
works pretty well. Since it only closes the throttle, it cannot
stick open.
There are several other ways to make it work, including using the
stop light filaments as the ground for the throttle servo circuit.
When the stop lamps are on, the control circuit goes dead.
Any system that allow unintended throttle opening is faulty, they
really have to be failsafe. This is why the throttle spring is on
the throttle, not the dash -- that way if the linkage breaks, the
throttle goes closed instead of falling wide open.
Very expensive over-reliance on very complex electronics for very
marginal results. I cannot be convinced that "active traction
control" does much that a minimally competent driver can do.
Antilock brakes are great, but individual "wheel speed control" to
keep an SUV from falling over is B...sh... The only thing that's
gonna keep a vehicle from rolling over in a minor accident, as all
SUVs and Minivans do, is to lower the center of gravity about 18".
Peter
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