Dyno with 100 octane petrol?

ChrisSlicks

Depends on the exact formulation. Shell Optimax+ was 99.4 RON / 87.5 MON which averages out to 93.45.

Do they even sell the Shell 100 RON in Australia anymore? I heard they were stopping last year and that now the best you could get is 98 RON (98.3 RON / 86.9 ). Probably not much different overall.

Phimosis

Usually motor and reasearch octane differ by 10 points. I wasn't sure about Shell in Australia, so I went and looked up the MSDS on it:

Shell V-Power Racing with new friction modification technology, a minimum Research Octane Number of 100 and a Motor Octane Number of 89, exceeds the requirements of the Federal Fuel Quality Standards Act (Petrol Determination) for premium unleaded petrol. The new friction modification technology is designed to enable optimum engine efficiency and improved acceleration, in comparison with Shell Optimax Extreme. Shell V-Power Racing is ideal for use in modern high compression and knock-sensor vehicles that are 5% ethanol compatible.


so it's 94.5 R+M/2

PS I read something about Optimax Extreme being phased out with the new product being called V-power racing, for whatever it's worth.