fuel quality
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
How do we know it's "exactly" the same engine? I'm not doubting you, but I have no idea if compression is identical. The ignition timing curve may be different as well, that alone could account for that.
Mountain Pass
Joined: Aug 2019
Posts: 151
Likes: 3
From: Poland
IMHO in modern engines is no metter, you can use 87 or 91, ECU use knocking sensor and change ignition time. On higher octane you can have better performance only when your ECU is tuned to this gasoline. I use 98 octane gasoline on my 2V 4,6 Expy. I use it because it's premium gas here ( cleaner and better for injection system ) but it nothing change compare to regular 95 octane fuel, car run the same.
the change of octane is felt in old carburetor engines where the ECU did not modify the engine operation.
but if you go to some tuner to change and tune up ECU map, you can use other octane than is in your car spec and your ECU will go better on this.
the change of octane is felt in old carburetor engines where the ECU did not modify the engine operation.
but if you go to some tuner to change and tune up ECU map, you can use other octane than is in your car spec and your ECU will go better on this.
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