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#31
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Re: fuel fuel injection cut off when engine brakes the car
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about the rich mix as soon as you pres the throttle, the ecu fuel mapping consider enriching the mix only when necesary by controlling the injector on time. I believe that by pass valve is not completely closed when engine brake except when in cruise control... that would explain why engine brake power is greater under cruise control... this would means that, actually, our ecu does FI cutoff but bypass valve controls the amount of air getting into combustion chambers. Maybe that is why car industry does not use this kind of bypass valves anymore, they replaced it by stepper motors (syncronized cero magnetic slip, fast, precise and huge torque) |
#32
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Re: fuel fuel injection cut off when engine brakes the car
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Cutting the fuel during this shut down prevents this condition. At the same time the Idle By-pass valve is opened, to catch the engine at 1250 rpm, stepping down, to bring the engine down to a clean idle. Hence the reason for later cars to use direct cylinder injection. Quote:
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Harvey.
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