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Quote: Originally Posted by GJB Anyone done any dyno runs with U4 or MR12? What are U4 & MR12 ?
Fuel.
Ok , like 91 or 98 in OZ
http://www.vpracingfuels.com/motoroadracing.html U4 looks to be 103 octane, MR12 is 87.
Quote: Originally Posted by Betterbuell Ok , like 91 or 98 in OZ Not really. Both are oxygenated racing fuels.
Yes, oxygenated. Gives a 5% or so HP increase and much crisper throttle response.