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Racing fuel in a Z

A station here is selling racing fuel. Say you 'accidentally' filled her up with racing fuel, what would happen?

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Old 12-01-2009, 03:01 AM   #1 (permalink)
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Default Racing fuel in a Z

A station here is selling racing fuel. Say you 'accidentally' filled her up with racing fuel, what would happen?
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Old 12-01-2009, 03:21 AM   #2 (permalink)
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This will happen

http://www.youtube.com/watch?v=FAQ5mRq9kes
http://www.youtube.com/watch?v=FAQ5mRq9kes
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Old 12-01-2009, 08:28 AM   #3 (permalink)
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Knock Sensors FTW.
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Old 12-01-2009, 09:08 AM   #4 (permalink)
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Personally, I wouldn't "accidently" put anything other than 91-93 octane in my Z.

Anything above that is a waste, anything below that risks the engine.
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Old 12-01-2009, 09:13 AM   #5 (permalink)
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Clearly anything above is not a waste as shown by the video above.
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Old 12-01-2009, 09:21 AM   #6 (permalink)
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Shell claimed their V-power that sell worldwide is 99% same as the ones put into the Ferrari F-1 team...
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Old 12-01-2009, 09:34 AM   #7 (permalink)
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Quote:
Originally Posted by Chan Chee Hoe View Post
Shell claimed their V-power that sell worldwide is 99% same as the ones put into the Ferrari F-1 team...
1% can be a huge difference with fuel.
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Old 12-01-2009, 10:03 AM   #8 (permalink)
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As the video shows, some amount of high octane is not a waste in this car - the timing adjusts and you get some of the benefit. I definitely notice the difference when I put in a few gallons at the track (of course, our maximum normally available octane here is 91).

I'm not saying to fill the tank with 107, but mixing in some 107 can have noticeable affect. My guess is the max usable octane is about 96 or so, at which point you stop getting any benefit with the stock motor.
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Old 12-01-2009, 10:06 AM   #9 (permalink)
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My buddy and I go to the strip a lot. He drives the 370z. If anything you are advancing the timing due to the octane - it wouldn't hurt.

We basically coast our cars on empty then fill w/ around 3-4 gallons on VP109 (101 octane). BIG improvement.

Your ECU needs time to adapt. A couple WOT pulls should be good.
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Old 12-01-2009, 10:11 AM   #10 (permalink)
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The engine's VVEL is pure awesomeness
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Old 12-01-2009, 12:36 PM   #11 (permalink)
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Quote:
Originally Posted by imag View Post
As the video shows, some amount of high octane is not a waste in this car - the timing adjusts and you get some of the benefit. I definitely notice the difference when I put in a few gallons at the track (of course, our maximum normally available octane here is 91).

I'm not saying to fill the tank with 107, but mixing in some 107 can have noticeable affect. My guess is the max usable octane is about 96 or so, at which point you stop getting any benefit with the stock motor.
As the video indicates, it's oxygenated fuel. Leans it way out and make it burn hotter.
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Old 12-01-2009, 12:39 PM   #12 (permalink)
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Quote:
Originally Posted by kannibul View Post
As the video indicates, it's oxygenated fuel. Leans it way out and make it burn hotter.
It's not the octane, it's the oxygen content. If you tried the same experiment with high-octane non-oxygenated fuel you would not gain any power, you might actually lose power.
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Old 12-01-2009, 12:40 PM   #13 (permalink)
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Quote:
Originally Posted by ianthegreat View Post
My buddy and I go to the strip a lot. He drives the 370z. If anything you are advancing the timing due to the octane - it wouldn't hurt.

We basically coast our cars on empty then fill w/ around 3-4 gallons on VP109 (101 octane). BIG improvement.

Your ECU needs time to adapt. A couple WOT pulls should be good.
Placebo

Do a few drag runs with 91, then do a few with 101.
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Old 12-01-2009, 12:45 PM   #14 (permalink)
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Quote:
Originally Posted by ianthegreat View Post
My buddy and I go to the strip a lot. He drives the 370z. If anything you are advancing the timing due to the octane - it wouldn't hurt.

We basically coast our cars on empty then fill w/ around 3-4 gallons on VP109 (101 octane). BIG improvement.

Your ECU needs time to adapt. A couple WOT pulls should be good.
VP109 is oxygenated and is 105 octane (R+M/2). Given that you can't advance the timing or increase compression most of the gain will be from the oxygen content.
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Old 12-01-2009, 12:47 PM   #15 (permalink)
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Quote:
Originally Posted by ChrisSlicks View Post
It's not the octane, it's the oxygen content. If you tried the same experiment with high-octane non-oxygenated fuel you would not gain any power, you might actually lose power.
It's amazing how much octane is thrown around as a way to increase HP.

The car is designed to run on 91. Running less than that trips the knock sensors to retard timing. It won't advance timing due to higher octane - in fact, the car won't even "know" that it's running on higher octane, it simply knows that the knock sensors aren't tripping.
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