Abstract: A vacuum modulator control for automatic transmission racing cars includes a cylinder having one port communicating with the motor vacuum and the other port going to the vacuum line to the transmission. An adjustable knob adjusts the vacuum to a fixed amount regardless of the transmission gear.
Abstract: An adjustable fully automatic vacuum modulator control, for use in vehicles having automatic transmission with a vacuum modulator includes a cylinder which contains a slidable piston and front face having an adjustable stop to regulate the vacuum flow. Three ports communicate with the interior of the cylinder and the position of the piston changes during conditions of acceleration and deceleration.
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