on cars which don’t do it in real life, for example the bmw i8, why does this happen, it is silly plus ruins the sound of the car.
another example would be the abarth 695
The reason is on race tune with race gas, snapping the throttle shut causes a momentary over-richness, particularily in forced induction without diverter valves. The high temps and ignition advance they run cause this still fueled air to ignite when now in oxygen… They in fact do it in real life. An old hotrod trick on standard cars many moons ago was to put a spark plug in the tailpipe to cause it.
So it is more pronounced visually vs real life, but it does happen on high performance applications.
Because this is a video game, and flame spits are cool.
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“Cars that shoot flames are automatically better than those that don’t.” - Matt Farah, The Smoking Tire