USA spec RC390 - recommended octane?
guzz46
New Member
The manual states to use 95 RON.
Treachery
Moderator
^^^^^
That's going to be US 91 octane, or in most areas, premium.
That's going to be US 91 octane, or in most areas, premium.
emeglasson
New Member
Any ideas on weather or not it makes sense to use race gas at the track; VP110?. Will it help much? Will it cause any problems?
gbabyracing
Member
I used VP T4 this last few races in then KTM. It is a pump replacement race fuel. It runs about $13-14 gallon. I use it on all my race bikes. On our SV650's, it's 2hp pour in and a 1/2 second or more acceleration. (on dyno) You can feel the crispness of throttle when running over pump fuels. A very stable unleaded non ethanol fuel that is a 94 motor octane, 100 research method.. If I don't run this, I run 91 research method octane non ethanol pump fuel. If I don't know the local fuel quality, I run T4.
I can always go to a track around the country and know safely exactly how our bikes will perform.
I can always go to a track around the country and know safely exactly how our bikes will perform.
mr-fabricator
New Member
Use 95 as thats what its mapped for , 98 will givr u the ability to tune more ignition advance as it resists detonation but as for performance u wont / shouldnt see any difference between 95 and 98 on standard ecu .
Placebo effect may play a part and i am / was subject to this but the physics and science supports that u won't have and advantage by just putting higher octane fuel in .
Last point is on very warm days the fuel in your tank will be warmer and inlet temps higher , this can possibly cause pre detonation of fuels in comparrison to ignition settings so if u wanted to be uber safe use 98 .
Safety margins are always good wich is why standard maps are so rich and ignition advance tame . Putting 98 in will only add a further safety margine but still not increase performance .
. Just from what ive researched .
Regards lee
Placebo effect may play a part and i am / was subject to this but the physics and science supports that u won't have and advantage by just putting higher octane fuel in .
Last point is on very warm days the fuel in your tank will be warmer and inlet temps higher , this can possibly cause pre detonation of fuels in comparrison to ignition settings so if u wanted to be uber safe use 98 .
Safety margins are always good wich is why standard maps are so rich and ignition advance tame . Putting 98 in will only add a further safety margine but still not increase performance .
. Just from what ive researched .
Regards lee
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