What Octane to run?!? - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Scottishgames · 03-05-2011, 04:37 PM

:seesaw:

BowlingSS · 03-05-2011, 05:00 PM

Quote:

Originally Posted by iNTERNETUAL

I have been using the Mid-Grade "89", If I want to jump to the 93, whats the best way to do it. I heard its not good for your engine to jump up after using lower grade fuel.

Just do the fuse pull after going to 93. I always use 93 in my baby.

Bill

MMX RS · 03-06-2011, 11:26 AM

Sorry,
What's the "fuse pull"? Is it as simple as it sounds (yanking a fuse for a minute and reinstalling it?)

Quote:

Originally Posted by BowlingSS

Just do the fuse pull after going to 93. I always use 93 in my baby.

Bill

Nomad · 03-06-2011, 12:29 PM

Check out this sticky from the Bolt On section. Will tell you everything you need to know. http://www.camaro5.com/forums/showthread.php?t=38964

rtcat600man · 03-06-2011, 01:28 PM

Quote:

Originally Posted by MMX RS

Sorry,
What's the "fuse pull"? Is it as simple as it sounds (yanking a fuse for a minute and reinstalling it?)

Fuse pull is for the V8 not the V6.

Nomad · 03-06-2011, 07:21 PM

Quote:

Originally Posted by rtcat600man

Fuse pull is for the V8 not the V6.

Missed that. Sorry.

MMX RS · 03-06-2011, 07:30 PM

Does the LLT automatically adjust its timings for higher octane then without doing what the V8 needs?

Russell James · 03-06-2011, 08:21 PM

No, the LLT does not have a high octane map. It's calibrated to run on 87, and like all modern engines can reduce timing if it senses knock. But it's not going to sense higher octane and go to a more aggressive timing map. At most, it would avoid reducing the timing if the previous fuel you were running was causing some spark knock. In other words, premium would not increase your power, it may just not reduce it as much if the other regular fuel was causing some knock. Because it costs more, psychologically you will believe it is running much better.

ChuckD · 03-18-2011, 10:08 PM

Quote:

Originally Posted by clg_98ta

You should not notice any ping... the knock sensor will detect it before you hear it and retard your timing. Not too noticeable in everyday driving, but your engine won't make much power w/o spark advance. But you will definitely notice at WOT, and the dyno will notice as well.

Correct. The ECU's have octane spark tables and if they detect slight knock, they immediately switch to a lower octane spark table. There's nothing wrong with running it on 87 octane. The car was calibrated to run on a wide range of octane.

I run 87 in the winter.

bowtieguy66 · 04-02-2011, 06:58 PM

Altitude will play a part with what you can run as well, air pressure is lower at higher altitudes, meaning the pressure in the cylinders is lower, too.

So by going up 5,000-plus feet in elevation, you've effectively lowered the compression ratio of your engine, and that means you can use lower octane fuel without making the engine ping.

Altitude where I live, 85 octane is the equivalent of 87 octane at sea level. It is why in mountainous areas you can only get 89 or near octane fuel.

It's one of the fringe benefits of living up here in the mountains. Along with shortness of breath, -30 degree weather etc.

03-05-2011, 04:37 PM	#29
Scottishgames Suck'n Gas And Haul'n Ass Drives: 2011 1LT/RS - 1936 Chevy Streetrod Join Date: Oct 2010 Location: Ohio Posts: 344	:seesaw: __________________ http://www.camaro5.com/forums/album....ictureid=53017

03-06-2011, 12:29 PM	#32
Nomad Drives: '11 2SS/RS RJT M6 Join Date: Oct 2010 Location: Grounded in the 'Shwa Posts: 478 View My Garage	Check out this sticky from the Bolt On section. Will tell you everything you need to know. http://www.camaro5.com/forums/showthread.php?t=38964 __________________ Vararam CAI, Elite Engineering Catch Can, Separate Clutch Fluid Reservoir, Ghost Armor Full Protection Package, Chromed Turn Signal Bulbs, RPI Stealth Splash Guards, Skip Shift Eliminator, Defenderworx Chrome Bowtie Inserts, Pfadt Trailing Arms, Camaro Decal Store CGM Hood Spears with "376ci" custom text, Billet Depot/Drake Underhood Polished Caps, CGM Lug Nut Decals, Pedders Front Radius Rod Inserts, JacFab Front License Plate Bracket

03-06-2011, 07:30 PM	#35
MMX RS Drives: MMX Camaro 2LT RS Join Date: May 2010 Location: Indianapolis Posts: 71	Does the LLT automatically adjust its timings for higher octane then without doing what the V8 needs? __________________ Selene: 2010 RJT/2Tone 2LT RS A6 Blackout Front/Rear Bowties, RS badging INJEN Power-Flow Intake MRT v2 Axle-back Exhaust VMax Spiral-ported TB; VMax Ice-olator Vitesse Throttle Controller RX Catch-Can RJT Eibach Sway Bars AAC Plasma LED DRLs; Sequential Turn Signals Black Gill Inserts; Red-swapped Door and Dash ABL

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03-06-2011, 08:21 PM	#36
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	No, the LLT does not have a high octane map. It's calibrated to run on 87, and like all modern engines can reduce timing if it senses knock. But it's not going to sense higher octane and go to a more aggressive timing map. At most, it would avoid reducing the timing if the previous fuel you were running was causing some spark knock. In other words, premium would not increase your power, it may just not reduce it as much if the other regular fuel was causing some knock. Because it costs more, psychologically you will believe it is running much better.

04-02-2011, 06:58 PM	#38
bowtieguy66 Drives: 2010 camaro ss Join Date: Mar 2011 Location: north east utah Posts: 33	Altitude will play a part with what you can run as well, air pressure is lower at higher altitudes, meaning the pressure in the cylinders is lower, too. So by going up 5,000-plus feet in elevation, you've effectively lowered the compression ratio of your engine, and that means you can use lower octane fuel without making the engine ping. Altitude where I live, 85 octane is the equivalent of 87 octane at sea level. It is why in mountainous areas you can only get 89 or near octane fuel. It's one of the fringe benefits of living up here in the mountains. Along with shortness of breath, -30 degree weather etc.