93 octane worth it?

Zaggeron · 01-29-2010, 07:12 PM

unless you change your compression ratio you won't realize any advantages to higher octanes. Remember octane is not a measurement of energy potential -- it measures a fuel's resistance to premature detonation. Higher octanes mean you can safely compress the gas further. But you can't take advantage of that just by filling up with higher octane

Modshack · 01-30-2010, 10:38 AM

Quote:

Originally Posted by Zaggeron

unless you change your compression ratio you won't realize any advantages to higher octanes. Remember octane is not a measurement of energy potential -- it measures a fuel's resistance to premature detonation. Higher octanes mean you can safely compress the gas further. But you can't take advantage of that just by filling up with higher octane

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...

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!

01-29-2010, 07:12 PM	#1 (permalink)
Zaggeron A True Z Fanatic Join Date: Jan 2010 Location: Austin, TX Posts: 1,951 Drives: '10 370ZR '13 BRZ Rep Power: 19	unless you change your compression ratio you won't realize any advantages to higher octanes. Remember octane is not a measurement of energy potential -- it measures a fuel's resistance to premature detonation. Higher octanes mean you can safely compress the gas further. But you can't take advantage of that just by filling up with higher octane __________________ 2010 Platinum Graphite 370z Roadster:Touring/Sport 2013 Subaru BRZ Limited

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
87 octane fuel in the Z	jmtt90	Nissan 370Z General Discussions	23	11-19-2010 10:01 PM
89 octane	darkseed	The Lounge (Off Topic)	31	11-11-2009 03:45 AM
The Octane Challenge	KillBill	Track / Autocross / Drifting / Dragstrip	4	10-12-2009 05:05 PM
100 Octane Gas Stations	ZzzZz	Southern California Region	1	09-02-2009 06:05 PM
Sunoco Octane 94	YamahaR6	Canada	6	08-04-2009 10:38 AM