For example, a regular grocery-getter with enough torque just to get around simply rolls off when in D and at minimum revs.
Why do super or hypercars not just take off when the same is done? I would assume that the amount of torque at the same rev range would be significantly higher for example in an Agera versus an Accord.
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Engines at idle RPMs do not make that much torque, regardless of whether they are a ‘supercar’.
When you read torque values on spec sheets, usually the manufacturer is picking the highest value across the whole RPM range. Usually the torque value they select is going to be between 2000 to 7000 RPM. Below that range would read much lower torque.
Gasoline engines are very poor at making power at low RPMs. If you got the actual torque value from a super car with an engine at idle speed, it would still be on the order of a big riding mower.
Additionally, modern engine control systems estimate and then control the torque produced by the engine in real time. So even if an engine could produce a high torque at idle, the control system could easily modulate its properties for drive-ability.
Interestingly, electric cars must deal with this problem because they CAN produce full torque at near zero RPM. If the torque were not controlled, it would be super easy to spin the wheels at every traffic light. Fortunately, this is easy to modulate with current limiting.
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