![]() but it turned out it was ''normal shell'' not the Super unleaded I made a phone call ''what fuel did you fill the car up with''.''Shell, like you told me''. The car went off to do a promotional track day and returned for my 'playing about' with 269 hp. I was developing/playing on the (chassis) dyno trying to get max hp out of the cars, I had got a very repeatable 275 hp with a combination of modded cat/air filter and some added fuel via a 'tricked' temperature sensor. ![]() Race team running 1991 964 Porsche Carrera RS cars, we always used Shell ''super unleaded'' You need to remember that better fuel does not always mean 'better performance' as the ignition timing will have been optimised for a particular rating, this example was some years ago. "Shell V-Power 98", "Caltex Platinum 98 with Techron", "Esso Mobil Synergy 8000" and "SPC LEVO 98" in Singapore, "BP Ultimate 98/Mobil Synergy 8000" in New Zealand, "SP98" in France, "Super 98" in Belgium, Great Britain, Slovenia and Spain Here is the numbers from the link in my post above for the 98 Bp Ultimate I use. I've heard conflicting things about it, like unless your bike is mapped for it using super unleaded (97-99) is a waste of time, but like you say the tank on the RSV4 is so small it doesn't make much difference to use the better fuel, I just wondered if there's any point in doing so though.Īlso like someone else said octane ratings in the US and Europe are measured differently, I think European fuel still works out a little higher but the difference isn't as big as the numbers first look.aAs far as mapping goes it is not necessary in the difference between 95 & 98 RON Euro spec fuel, the 98 just burns a faction slower & more controled than the 95, giving a better combustion cycle.
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