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Highest Octane For Stock ECU??

Originally Posted by USNA94 Our tests showed that there was no appreciable increase in power when using a higher octane rated fuel but there was definitely a decrease in power

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Highest Octane For Stock ECU?? Highest Octane For Stock ECU??
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Old 09-03-2009, 04:02 PM   #1 (permalink)
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Our tests showed that there was no appreciable increase in power when using a higher octane rated fuel but there was definitely a decrease in power when using a lower octane rated fuel at the higher end of the RPM spectrum.

Now, would you like me to prove that Force=mass x acceleration or are you going to take my word for it?

Yes, USNA94, please prove what the optimal octane is for the 370z.
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Old 09-03-2009, 04:08 PM   #2 (permalink)
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Yes, USNA94, please prove what the optimal octane is for the 370z.
Well, to be fair, the question of what the optimal octane for the 370Z is, and whether or not higher octane produces additional power, are two separate questions. Given the level of detail in USNA94's explanation of how octane works, I have no reason to doubt the information. It'd just be cool to see some definitive evidence is all. After all, unless he's making up stories, he was privy to such evidence by virtue of his lab test. It'd be nice if he has the graphs from that test or something to share with us.
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Old 09-03-2009, 04:15 PM   #3 (permalink)
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Yes, USNA94, please prove what the optimal octane is for the 370z.
Optical would be whatever octane you tune it for before it starts knocking and pinging ... its hard to say what its tuned for stock because the ECU is the learning type so it can adjust itself to whatever premium gas is avaliable to it. You could say that its tuned to 91 and will increase performance with 93 as it "learns" it or that its tuned to 93 and decreases performance with 91. Whatever works best for you I assume.
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Old 09-03-2009, 04:44 PM   #4 (permalink)
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Yes, USNA94, please prove what the optimal octane is for the 370z.
If you would like to provide me your engine, a test stand, and a dyno (I'll supply the gas of various octane ratings because i'm generous like that) I would gladly provide this information with some pretty graphs and everything. If not, I suggest going with what the owners manual states. I hear those Japanese engineers are pretty sharp.
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Old 09-03-2009, 05:27 PM   #5 (permalink)
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Well, I might just spend some time and money on dyno'ing with 91, 93, 94 and share the results with you all. One of these days...

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If you would like to provide me your engine, a test stand, and a dyno (I'll supply the gas of various octane ratings because i'm generous like that) I would gladly provide this information with some pretty graphs and everything. If not, I suggest going with what the owners manual states. I hear those Japanese engineers are pretty sharp.
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