I'm planning to change the engine type in a Japanese compact car to boost highway performance. What are the pros and cons of a larger displacement engine compared to a high-compression turbocharged motor? How does it affect fuel efficiency, reliability, and high-speed handling? What suspension or aerodynamic modifications would make sense to safely harness the extra power? I’d love to hear your experiences and opinions!
How does the choice of engine type in Japanese compact cars affect highway speed?
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A larger displacement engine delivers smoother torque and is generally more robust under sustained loads, but it increases fuel consumption and weight; a high-compression turbo engine achieves higher output at the same displacement with better efficiency, though it’s more prone to overheating and requires stronger cooling. For the extra power, you should tune the suspension with stiffer stabilizers and possibly a bit more front or rear splitter to keep the car stable at high highway speeds.