575 - Fuel quality / octane rating - Ferrari Life
 
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post #1 of 9 Old 01-31-2014, 08:02 AM Thread Starter
 
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575 - Fuel quality / octane rating

Hi All , being a newby , I have a question for the European 575 owners: which fuel do you use in your 575,:95 or 98 (super plus or v power)? is the 575 ECU setup to distinguish the different octane rating ?


I did not have yet the chance to (properly) drive my 575 and therefore I am in no position to evaluate (qualitatively) this aspect. Thank you (I apologize if this topic has been already addressed)
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post #2 of 9 Old 01-31-2014, 08:06 AM
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They still offer 95 and 98 Octane in Europe? That's amazing! Here Shell's highest is 91 Octane, and only Sunoco offers a higher 94 Octane, though Ferrari recommends the Shell gas
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post #3 of 9 Old 01-31-2014, 08:19 AM Thread Starter
 
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Originally Posted by tifosi_ View Post
They still offer 95 and 98 Octane in Europe? That's amazing! Here Shell's highest is 91 Octane, and only Sunoco offers a higher 94 Octane, though Ferrari recommends the Shell gas


I think the EU and the US octane rating numbers are not comparable. The EU is in RON while the US is not indicated in the same manner. I am no expert, maybe someone more knowledgeable can chime in?
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post #4 of 9 Old 01-31-2014, 08:50 AM
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@tifosi; The units of measures in Europe are not the same as in the USA; Europe quote Research Octane Number (RON) while the US uses the mean of Research and Motor Octane Number (MON). The 98 and 95 are RON. The MONs are generally between 85 and 87. so this gives gasoliines with (R+M)/2. between 90 and 94.
However in some countries you can find 100 RON and even 101 RON.
@riviera European regulations, I beleive, require cars to run on 95 RON and my European 550 drivers manual says use at least 95 RON unleaded,
Many high perfrmance cars meet this requirement by having knock sensors on the engine although I have not found one on the Maranello wiring diagram, The knock sensor via the ECU detunes the engine to run without knock..
The engine may or may not generate more power on 98 or more RON fuel.
Another thing to consider is the presence of alcohol or not in the fuel. Some of the degradation of the elastomeric seals in the fuel tank and pump system may be because the elastomer is attacked by alcohols.
I use 98 RON unleaded alcohol free fuel and higher RON if I can find it.

'97 Rosso Corsa 550 Maranello
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post #5 of 9 Old 01-31-2014, 09:21 AM
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575s in Europe need a recommended RON of 95-98 according to the owners manual. In the US that is the equivalent of 91-93 using research octane number plus motor octane number divided by 2. There will be virtually no hp gain from using 98 vs 95 in Europe (or 93 vs 91 in the US) and anything higher is a waste of money without remapping the Motronic DMEs.

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post #6 of 9 Old 01-31-2014, 10:35 AM
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Quote:
Originally Posted by tazandjan View Post
575s in Europe need a recommended RON of 95-98 according to the owners manual. In the US that is the equivalent of 91-93 using research octane number plus motor octane number divided by 2. There will be virtually no hp gain from using 98 vs 95 in Europe (or 93 vs 91 in the US) and anything higher is a waste of money without remapping the Motronic DMEs.
I would concur with that: although I have no technical knowledge in re 550s, this subject has been very thoroughly discussed with respect to later air-cooled 911s (in my case type 964) which are set up to run on low octane fuel. If you put higher octane fuel in you get no difference in performance or consumption if you haven't had the DME re-mapped to take advantage of the higher octane, so it is just a waste of money.

Best wishes, John
Ferrari: 550 Maranello S/N 110995, Dino 246 GT S/N 6934
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post #7 of 9 Old 01-31-2014, 10:59 AM
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This is quite interesting, thanks for the info everyone

Clyde
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post #8 of 9 Old 02-01-2014, 12:27 AM Thread Starter
 
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Thank you for all the replies, very interesting insights. I thought the 575 ECU would adjust on the higher fuel rating . As a side info - on my 993 I was told at Porsche Classic that the ECU does adjust and they warmly recommend the 98 super plus.
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post #9 of 9 Old 02-01-2014, 04:10 AM
 
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My experience between 95 and 98 RON is different top speed. That indicate lower peak hp with 95 RON and it makes even less power as they now must add 5-10% Ethanol which lower the energy content but increase octane rating slightly. They dont do that with 98 RON. If possible I prefer Shell V-Power 100 but they are closing down many of their gas-stations here and the remaining ones are automatic stations. It's extra tough to break even if you are in the gasoline business in Sweden as 75% of the pump price is tax plus last years scam with a cash handling security company embezzlement of est. $150,000,000 from gas-stations and other shops with cash customers.
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