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#26
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Join Date: Jan 2005
Location: Griffin, GA
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About to finish my first tank of 89 octane mid-grade. No performance differences or sounds but I got 20 miles for this tank and low fuel light hasn't come on yet. I'm sold for now...
Last edited by GRT8; 02-10-2005 at 09:43 AM.
#27
RX8 and a Truk....
Originally Posted by Fanman
Butt dynos are notoriously inaccurate :D
Yes, the engine/electronics are set for use with 91 octane. In not using 91 octane, gasolines with 87 octane ratings the engine is set s that timing will be retarded further at WOT.
Yes, the engine/electronics are set for use with 91 octane. In not using 91 octane, gasolines with 87 octane ratings the engine is set s that timing will be retarded further at WOT.
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#28
Insanely Yellow
DMP: Absolutely true. There is no "octane sensor" that looks at the gas. Only the O2 and knock sensors working together to detect premature ignition (aka "knock").
#29
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Location: Milwaukee Wi.
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Originally Posted by LucasET
So, I'm too lazy to look it up and I know it's there, but....what are peoples results with ethanol blend so far? I live in Iowa, and every mid-grade brand is a blend. Ethanol obviously burns cleaner than regular fuel, but it also burns at a lower temp...so would I have less build up but be losing power? And, is ethanol a no-no for the rotary? I've had my 8 for just under a year, and the majority of the time, I use BP premium, mostly because there are no Shell stations to be found where I live. I average about 19mpg give or take.
I burn 87 octane ethanol reformalated gas all winter. No problems flooding starting/stopping cold etc. Seems to run fine. I tried 93 octane and the power seems the same. I'm hopping ethanol keeps the engine cleaner. Anyone know?
#30
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Sorry for the "non-technical" explanation. But you are correct that it is based on detonation. It's not like a car can sense octane #'s. However the ECU in many of today's high performance cars will detect pinging & detonation long before the person driving the car would & adjust faster (retarding the engine) than we could. You might not feel the retardation of the timing but the loss of hp is there. If I took away 10-15 hp from this car, I would hazard a guess that not many people would be able to know that with a "butt dyno." In normal around town driving it will pretty much be unnoticeable, but would come into play in high performance/track driving. Similar to what happened to the M3 in the article.
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