89 or 93?
03-24-2009, 06:07 PM
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89 or 93?
Hey yall.. i got a question.. i run 93 on my car now.. is it safe to run 89 on RX8s without them detonating? i was just wondering cause i race my car and i dont want to ruin anything... Thanks!! 
03-24-2009, 09:02 PM
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It will just damage your wallet not your car.
You do know there is no advantage or additional power to be made running anything higher than 91 octane in a stock (or even mildly ported) RX-8? No additional BTUs, no additional power.
A common misconception is that power output or fuel mileage can be improved by burning higher octane fuel than a particular engine was designed for. The power output of an engine depends in part on the energy density of its fuel, but similar fuels with different octane ratings have similar density. Since switching to a higher octane fuel does not add any more hydrocarbon content or oxygen, the engine cannot produce more power.
No need to ever use anything more than 91 in a RX-8. And if you are not seeing high (80F +) ambient air temps, you can probably use lower.
You do know there is no advantage or additional power to be made running anything higher than 91 octane in a stock (or even mildly ported) RX-8? No additional BTUs, no additional power.
A common misconception is that power output or fuel mileage can be improved by burning higher octane fuel than a particular engine was designed for. The power output of an engine depends in part on the energy density of its fuel, but similar fuels with different octane ratings have similar density. Since switching to a higher octane fuel does not add any more hydrocarbon content or oxygen, the engine cannot produce more power.
No need to ever use anything more than 91 in a RX-8. And if you are not seeing high (80F +) ambient air temps, you can probably use lower.