Delay at nanosecond revel

When the throttle valve is closed immediately from some rotation on internal combustion engine, much Carbon Oxide is exhausted polluting atmosphere by over-chock phenomena. Avoiding this inconvenient state, some mechanical device was invented, so to speak "Dash pod". This was settled on the idling stopper portion of throttle valve center shaft controlling the RPM transient, comes down to 1,000 RPM and the reduction rate is so gradual to the idling speed.

The control is effective to reduce the amount of Carbon Oxide included in exhaust gas, but the transient from 1,000 RPM to idling was very disgusting phenomena for the drivers at the beginning.
This mechanical system has been come down even to the most recent computer controlled system.

Most sophisticated controlled by wire system could control the rotational transient more easily than before because the transient curvature could be programmed in flash memory by the electric engineer not by mechanical one. The term "by wire" here does not mean some mechanical wire but an electric wiring. Of course, the result now is based on repeated trial and error, once a vacuum valve and an actuator were invited on the control system.

Talking about my experience, I clearly felt the accelerating response delay when Bosch L-jetro system had been invited comparing mechanical carburetor, and now more delay is felt after controlling throttle valve by wire has been introduced. Nanosecond revel delay as it may be, I feel the delay. This may be one of the reason to re-experiment the nostalgic no-delay acceleration response on mechanical carburetor in Air-cooled VW Beetle.