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well it's probably because of two reasons.
1st reason is that the car as you say is die cast, so it's heavier than most cars of their size. Now i assume that these cars use magnet steering much like our bits right? Anyway the heavier the car usually the harder it is on the steering meaning it requires a little bit more electricity to complete the task, so it draws the current and takes some of the electricity used for the motor.
2nd reason, perhaps the car was designed to slow down when turning so that you can steer with more control.
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