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FJR Motorcycle Forums
FJR Specific Discussion
85 Octane in The FJR
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<blockquote data-quote="Bounce" data-source="post: 1067967" data-attributes="member: 257"><p>IF the base motor is built to the higher octane in the first place. Otherwise it can only do what it was built to do. If that happens to be a build-to-87, then that's what it will perform best at and the ECU can only do "up to" that.</p><p></p><p>Take my STi. It was designed to 91. I got a custom tune that pushes more boost and it's tuned to 93. If I have only 91 or lower available, I make sure I don't "get into it" just to go easy on the motor. I've run 100+ (from the pump) in a couple of places just to see and real measured numbers as well as MPG and butt dyno reveals no improvements. At $8 a gallon, it's money down the drain.</p><p></p><p>The FJR is "built to" 87. You can custom tune it (or even custom build it) to a higher level that can then benefit from fuel combustion retardation (more octane) but out-of-the-box, anything more than just enough to avoid "knock" is, again, money down the drain.</p></blockquote><p></p>
[QUOTE="Bounce, post: 1067967, member: 257"] IF the base motor is built to the higher octane in the first place. Otherwise it can only do what it was built to do. If that happens to be a build-to-87, then that's what it will perform best at and the ECU can only do "up to" that. Take my STi. It was designed to 91. I got a custom tune that pushes more boost and it's tuned to 93. If I have only 91 or lower available, I make sure I don't "get into it" just to go easy on the motor. I've run 100+ (from the pump) in a couple of places just to see and real measured numbers as well as MPG and butt dyno reveals no improvements. At $8 a gallon, it's money down the drain. The FJR is "built to" 87. You can custom tune it (or even custom build it) to a higher level that can then benefit from fuel combustion retardation (more octane) but out-of-the-box, anything more than just enough to avoid "knock" is, again, money down the drain. [/QUOTE]
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FJR Motorcycle Forums
FJR Specific Discussion
85 Octane in The FJR
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