Why Do Turbocharged Engines Use 95 Octane Fuel?
2 Answers
Turbocharged engines use 95 octane fuel due to its excellent anti-knock properties. Here are the extended details: 1. High-octane fuel has a higher ignition point and better anti-knock performance, allowing for increased pressure in the engine cylinders, resulting in greater explosive recoil force and improved engine output power. 2. 95 octane fuel has a higher ignition point, slower combustion speed, and higher heat release, enabling it to meet the varying power demands of different engines. 3. The cylinder volume of a car engine remains constant. With an engine compression ratio of 11:1, meaning 11 volumes of air are compressed into 1 unit volume in the cylinder, the turbo starts working when the car is started, and the engine draws in air. 95 octane fuel can withstand higher pressure without causing knocking issues.
When I drove a turbocharged car before, I found that using 95-octane fuel was essential, mainly to prevent engine knocking. Turbo engines have high compression ratios and operate under significant pressure, causing temperatures in the combustion chamber to soar. If lower-octane fuel like 92 is used, the gasoline may ignite prematurely, resulting in knocking sounds—like a drum beating inside. Over time, this can damage pistons and valves, and repairs can cost thousands. Once, I mistakenly filled up with 92-octane fuel, and within less than a week, the engine warning light came on, with a noticeable drop in power. 95-octane fuel has a higher octane rating and better anti-knock properties, ensuring smooth combustion and maximum power output, making the drive smoother and more fuel-efficient. I recommend owners regularly check their manuals—most turbocharged cars recommend 95-octane or higher. Don’t risk major damage for minor savings; careful maintenance is key to keeping your car in top condition.
