93 octane worth it?

1slow370 · 01-30-2010, 10:39 AM

Quote:

Originally Posted by MightyBobo

Look up JP-5 specifically

ok but only cuz you didn't tear me a new hole about how it is clearly superior just cuz it says aviation grade or AVSMO

2theextreme · 01-30-2010, 10:42 AM

Quote:

Originally Posted by MightyBobo

I'll stick with my JP-5. You know what JP-5 is used in, right? Its exclusive! "High" rollers, only!

1slow370 · 01-30-2010, 11:01 AM

ok so it's carrier grade high flashpoint kerosine turbine fuel. It's still a heavy oil do you ever have injector fouling problems? run anything with it like a can of seafoam to prevent that, and do you use it regularly or track only. I'm interested because kerosine does have a higher specific energy and it may offer a power boost but i would be worried about fouling. The motor is 11-1 so i wouldn't be to worried about getting it to run though.

MightyBobo · 01-30-2010, 12:05 PM

Its used for this, specifically:

Get it? "HIGH" ROLLERS?! Harrrrrrrr

j.arnaldo · 01-30-2010, 12:06 PM

From 87 to 93, definitely!; from 91 to 93...?

KillerBee370 · 01-30-2010, 06:04 PM

Quote:

Originally Posted by ZzzZz

Fill up my Z with 91 or 93 but don't let me know.

$1000 says I can tell you the difference.

kenchan · 01-30-2010, 08:56 PM

93 is all we get around here for super unleaded... So that's what I use in my Z.

The BlueMax · 01-30-2010, 09:01 PM

I'm only on my second tank and I put 89 octane in it because some guy who worked as a fuel delivery driver told me that there wasn't really any difference in the plus vs. premium, but some difference in 87 standard. I don't think I have noticed anything yet, but the car's pcm would take the timming down to compensate. You don't notice it as much in a GM LT1 350 V8 as much as you will in the Nissan 3.7 V6. I'm still experimenting.

1slow370 · 01-30-2010, 09:03 PM

there are noticeable differences between fuels but usually only if you are comparing a good premium to a lesser grade fuel even of the same octane. It's more about the gas than it is the octane number.

as for the JP-5 apparently it is the naval standard for at sea operations so every plane on an aircraft carrier uses it

MightyBobo · 01-30-2010, 09:17 PM

Makes sense - its high flashpoint is crucial to...oh, I dont know...not killing the crew if it ignites, and its extremely low freezing point is crucial to the U2's ability to fly extremely high without its fuel freezing.

ChrisSlicks · 01-30-2010, 09:49 PM

Quote:

Originally Posted by bluemax

I'm only on my second tank and I put 89 octane in it because some guy who worked as a fuel delivery driver told me that there wasn't really any difference in the plus vs. premium, but some difference in 87 standard. I don't think I have noticed anything yet, but the car's pcm would take the timming down to compensate. You don't notice it as much in a GM LT1 350 V8 as much as you will in the Nissan 3.7 V6. I'm still experimenting.

89 is not recommended for continuous use given the high compression ratio that the 370 uses. Your fuel guy was correct in terms of additives, but you need a minimum of 91 to keep this engine happy. All my American cars are built for 87 so that's what I use.

1slow370 · 01-31-2010, 02:00 AM

Quote:

Originally Posted by ChrisSlicks

89 is not recommended for continuous use given the high compression ratio that the 370 uses. Your fuel guy was correct in terms of additives, but you need a minimum of 91 to keep this engine happy. All my American cars are built for 87 so that's what I use.

True that use what it says on the cap when in doubt.

ZzzZz · 02-01-2010, 08:48 PM

Quote:

Originally Posted by Modshack

Well.......That's not entirely true. With today's adaptive ECU's, the knock sensor will allow the advance of timing up to the point of detonation then back off slightly for maximum power and efficiencies. Higher octane allows more timing to be advanced with a result in slightly more performance. Cooler Intake temps also allow this advance. I've posted numerous charts and graphs on this in the past so I'll spare you that. The 370 ECU has proven to be very adaptive which is one reason it responds so well to mods without re-tuning and will respond to higher octanes as well, at least up to the max adjustment range within the ECU programming. . As an example from the Audi camp, the difference between a 93 octane program and a 100 octane program on a 1.8T motor is roughly 15-20 hp. The differences between the programs are are primarily timing advances...

Finally... a man who understands!

01-30-2010, 12:05 PM	#34 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 53	Its used for this, specifically: Get it? "HIGH" ROLLERS?! Harrrrrrrr __________________ I don't own a car anymore.

01-30-2010, 09:01 PM	#38 (permalink)
The BlueMax Enthusiast Member Join Date: Jan 2010 Location: Louisville Posts: 337 Drives: 09 370/97 T/A 01 ZRX Rep Power: 26	Still Investigating I'm only on my second tank and I put 89 octane in it because some guy who worked as a fuel delivery driver told me that there wasn't really any difference in the plus vs. premium, but some difference in 87 standard. I don't think I have noticed anything yet, but the car's pcm would take the timming down to compensate. You don't notice it as much in a GM LT1 350 V8 as much as you will in the Nissan 3.7 V6. I'm still experimenting.

01-30-2010, 09:17 PM	#40 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 53	Makes sense - its high flashpoint is crucial to...oh, I dont know...not killing the crew if it ignites, and its extremely low freezing point is crucial to the U2's ability to fly extremely high without its fuel freezing. __________________ I don't own a car anymore.

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01-30-2010, 11:01 AM	#33 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	ok so it's carrier grade high flashpoint kerosine turbine fuel. It's still a heavy oil do you ever have injector fouling problems? run anything with it like a can of seafoam to prevent that, and do you use it regularly or track only. I'm interested because kerosine does have a higher specific energy and it may offer a power boost but i would be worried about fouling. The motor is 11-1 so i wouldn't be to worried about getting it to run though.

01-30-2010, 12:06 PM	#35 (permalink)
j.arnaldo Banned Join Date: Oct 2009 Location: Puerto Rico Posts: 937 Drives: Nissan 350Z, 2004 Rep Power: 0	From 87 to 93, definitely!; from 91 to 93...?

01-30-2010, 08:56 PM	#37 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	93 is all we get around here for super unleaded... So that's what I use in my Z.

01-30-2010, 09:03 PM	#39 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	there are noticeable differences between fuels but usually only if you are comparing a good premium to a lesser grade fuel even of the same octane. It's more about the gas than it is the octane number. as for the JP-5 apparently it is the naval standard for at sea operations so every plane on an aircraft carrier uses it