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Pud237 · 13-05-2008

Originally Posted by newalfisti

Agree, the ECU will not advance the timing if you put 98RON. But it is perfectly capable to retard it. The use of 98RON will allow the ECU to correct the timing to a lesser extent and it will allow the engine to run at the nominal table values or close to them.
So you will indeed get a benefit by using 98RON.

IF there is any detonation of 95 octane fuel. Obviously if zero detonation of 95 fuel occurs, then there is no benefit to running 98.

13-05-2008	#37 (Post Link)
Pud237 AO Platinum Member Join Date: Apr 2006 Location: North Yorkshire Posts: 13,537 Member car: Alfa 156	Re: Rolling Road last night. Originally Posted by newalfisti Agree, the ECU will not advance the timing if you put 98RON. But it is perfectly capable to retard it. The use of 98RON will allow the ECU to correct the timing to a lesser extent and it will allow the engine to run at the nominal table values or close to them. So you will indeed get a benefit by using 98RON. IF there is any detonation of 95 octane fuel. Obviously if zero detonation of 95 fuel occurs, then there is no benefit to running 98.