tuning 4.6l

Post by **lafrad** » February 27th, 2011, 8:30 am

Naw, we measure octane differently in the US compared to any other country. 98 for them is 91/93 in the US.

Post by **montelibre** » February 27th, 2011, 8:48 am

In Europe, for example, the octane is higher (the price too!

) because the cars for this market have a hight CR , about 10 to 1 or more.

Post by **Cheromaniac** » February 27th, 2011, 9:04 am

herbiehind wrote: damn , i remember the good ole days of high octane

In Europe (and here in the UAE) they use the RON octane rating which is 4 points higher than the R+M/2 octane rating used in the US. Therefore:

91 RON = 87 US octane = E-Plus here in the UAE (my "winter" fuel)
95 RON = 91 US octane = Special here in the UAE (my "summer" fuel)
98 RON = 94 US octane = Super here in the UAE

Most modern high compression engines (10+:1 CR) have knock sensor control of ignition timing advance so that allows them to run on lower octane fuel without pinging but with a slight reduction in performance compared to running on Super.

Post by **herbiehind** » February 27th, 2011, 1:08 pm

gotcha . why would we make it the same? it's all much more confusing this way ..

tuning 4.6l

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