Hello
Is there a difference between a turbo and a Direct injection gas engine ?
Do these engines require the most expensive gas octane to last longer ?
Thank you
Gasoline Direct Injection, Turbo, and Octane are all independent of each other. And they can also all be used together.
Gasoline Direct Injection means gas is injected directly into the cylinder head, instead of the intake chamber where it normally is injected.
Turbo means getting more air into the engine. A turbo does this by using exhaust gasses to turn the turbo, thus getting more air into the intake.
Octane refers to the gasoline ability to prevent engine knock when ignited. The higher the octane number, the more compression the fuel can withstand before detonating. The lower the octane number, the lower the compression the fuel can withstand before detonating.
Use the gas the manufacturer recommends. Some cars require higher octane, many cars don't need higher octane. It doesn't matter whether it is GDI or Turbo. Some use lower octane, some use higher octane.
In most circumstances, use the gas the manufacturer recommends.
I wouldn't really say that octane and turbocharging are independent of each other, but I guess in terms of just concepts they are independent. All turbocharged/supercharged engines need to run higher octane gas because they have increased compression. However, modern engines like Mazda's new turbocharged engine can run a lower octane without risking engine knock but at the cost of some performance. Great write-up explaining all these though.
For turbocharged engines, there is an excellent write up under ‘Read this first’ sticky —> scroll down to Car Guides section -> click on ‘A deep dive into turbocharged engines’
https://carkiller.com/scottykilmer/qa/article-turbocharged-engines/
No, clean the valves yearly and change your oil more often......
