05-02-2016, 11:32 AM | #45 |
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Yes 99 Ron for uk V-Power (used to be 98 when it was called optimax). Some folks (Germany and Oz I know of) can get V-Power racing at 100 Ron. HP 'gain' is small yes, but plenty will swear it also gives a smoother more efficient engine. Others will say it's a load of marketing rubbish! You takes your choice.
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05-02-2016, 04:19 PM | #46 | |
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The US is a little different than the UK. Some states, like California, only have lower octane (AKI 91) fuel available at the pump while others, like Washington, offer higher octane (AKI 93). Everyone is going to put their state's "premium" into their M2, but we're wondering if those 2 octane points would make any difference at all. It seems nobody really knows yet. |
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05-02-2016, 04:22 PM | #47 | |
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On 91 upper RPM we see timing pull and heat indicative of 2 likely things - pre-det and turbo pushed outside of efficiency range (overboost). The latter happens on the standard N55 turbo at about 15psi. Given that we already know that at 15psi the N55 can make on the order of 20whp more than at 91, that 5hp number could be conservative. |
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05-03-2016, 09:07 AM | #48 | |
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Switched to Tesco Momentum 99 [TM99] and saw 1-1.5psi more boost over Shell v power ie more consistent 16.5psi with TM99. FWIW, with a tune, these N55 engines love octane. I put half a bottle of NF Race Octane booster into a tank of TM99 and tried Jb4 maps 5 and 7 - car was insane, hitting 18psi. Definitely not for the limp wristed.....
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05-03-2016, 09:28 AM | #49 | |
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05-03-2016, 10:07 AM | #50 |
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Mini - my JB4 car is stock apart from DP and I've yet to use OB on the track or drag strip. When used on public roads ie mixed driving its brutal even on part throttle. Full throttle is seriously mental, IMHO too much for the overcrowded roads in SE UK.
I do track days periodically and my current setup works well even when driven hard for 20min track sessions. I think FMIC and charge pipes would need upgrading to get the most out of OB on a circuit or at the drag strip. BP
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05-03-2016, 11:05 AM | #51 |
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I bought octane booster before I picked up my car because we only have 91 octane here, then I read that it can plug up exhaust sensors so I have never used it.
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