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The BMW Range
5 Series
F10, F11, F07
Ron Rating and Engine Power for F10
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<blockquote data-quote="Shotgun" data-source="post: 573950" data-attributes="member: 23827"><p>After going thru the web for information, i found some interesting information. According to wikipedia, <a href="http://en.wikipedia.org/wiki/Octane_rating" target="_blank">http://en.wikipedia.org/wiki/Octane_rating</a> here, the V power and V power racing here is RON97. In Singapore it is RON98. The regular unleaded is RON95. It makes sense now cos if it's RON98 here, they would have advertised it that way. Second piece of info is what I found from the US 5 Series owner's manual which says the 535i engine is rated at 300hp with AKI 91 fuels. AKI is the rating for the american and canadian system. AKI is the Anti-Knock index which is tested differently from the RON (Research octane Number) system. There is a table on the wiki website that equates the american AKI91 fuel to be similar but not exactly the same, to RON95 which is our regular fuel. </p><p></p><p>It also says that the regular american fuel is rated at AKI 87 which is equivalent to RON91-92 here. Thats probably why the bloke on the youtube site that dynoed the 535i only achieved 277hp at the wheels due to lower fuel quality and also some drivetrain losses. (check that youtube video out) </p><p></p><p>From the bits and pieces of info online, I would put a guess that at RON95 (regular unleaded here) the power output for the 535i should be 300hp which is not far off from the manufacturer's claim of 306hp with RON98. So if you use RON97 or Vpower, it should bring you closer to the claimed 306hp by BMW. Different strokes for different folks here but the lowest you would get from regular is 300hp which is pretty decent. </p><p></p><p>My original concern after watching the dyno video is that the car might lose lots of HP from using lower grade petrol here. Now I doubt that's the case and that i also know that we actually do get pretty good octane numbers from the petrol here. </p><p></p><p>On a different note, the americans actually recommend AKI89 or better for the 535i, which i guess to be RON92 equivalent. The disadvantage for that is a lower power output for engine.</p></blockquote><p></p>
[QUOTE="Shotgun, post: 573950, member: 23827"] After going thru the web for information, i found some interesting information. According to wikipedia, [url]http://en.wikipedia.org/wiki/Octane_rating[/url] here, the V power and V power racing here is RON97. In Singapore it is RON98. The regular unleaded is RON95. It makes sense now cos if it's RON98 here, they would have advertised it that way. Second piece of info is what I found from the US 5 Series owner's manual which says the 535i engine is rated at 300hp with AKI 91 fuels. AKI is the rating for the american and canadian system. AKI is the Anti-Knock index which is tested differently from the RON (Research octane Number) system. There is a table on the wiki website that equates the american AKI91 fuel to be similar but not exactly the same, to RON95 which is our regular fuel. It also says that the regular american fuel is rated at AKI 87 which is equivalent to RON91-92 here. Thats probably why the bloke on the youtube site that dynoed the 535i only achieved 277hp at the wheels due to lower fuel quality and also some drivetrain losses. (check that youtube video out) From the bits and pieces of info online, I would put a guess that at RON95 (regular unleaded here) the power output for the 535i should be 300hp which is not far off from the manufacturer's claim of 306hp with RON98. So if you use RON97 or Vpower, it should bring you closer to the claimed 306hp by BMW. Different strokes for different folks here but the lowest you would get from regular is 300hp which is pretty decent. My original concern after watching the dyno video is that the car might lose lots of HP from using lower grade petrol here. Now I doubt that's the case and that i also know that we actually do get pretty good octane numbers from the petrol here. On a different note, the americans actually recommend AKI89 or better for the 535i, which i guess to be RON92 equivalent. The disadvantage for that is a lower power output for engine. [/QUOTE]
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