Quote:
Originally Posted by Timpo
How do you know? Are you a car engineer?
I'm sure pretty much everywhere you look on google, they would teel you using lower octane gas will affect your gas mileage.
I'm not an engineer so I have no clue how realiable google articles are, just fyi.
Also it doesn't really matter if he's driving under "normal conditions"...what did you mean by this?
If engine has high enough compression or boost to detonate...I'd say high octane gas is necessary.
I know ECU will adjust ignition timing and stuff...but I don't think ECU can control air getting compressed and air friction igniting fuel in the combustion chamber.
Then again, I am a complete noob so...
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Actually I did get my engineering degree recently - you must have missed that post when I came back to RS after my absence.
I've actually built my own ECU from scratch and also built the world's first aftermarket drive-by-wire throttle controller to integrate DBW with non-DBW ECU's. So yes, I do know a bit about how ECU's work.
Your car will never know what octane is in the tank until such time as you require more power (like heavy acceleration) at which time it will detect knock and adjust timing accordingly to compensate. Under normal driving your ECU will not know if you have regular or premium in the tank.