The normal maximum for electric vehicles is to set the transmitter at 100% before calibrating the esc, any racing adjustments would then usually be to reduce the throttle EPA or use the rate switch or knob to accommodate slippery racing conditions.
Most transmitters are designed to accommodate servo driven throttles for I/C engines as well, here you may need the extra mechanical travel over the normal 100% servo throw to get full travel of the carburetor throttle slide, hence the extra 50% of available travel.
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