91 Octane in 93 Octane tune - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JLBIII · 10-04-2015, 10:27 AM

Currently live in Pa where we have 93 octane. My Camaro has a LS3 conversion tuned for 93 octane. I may be moving to Northern Maine next year where they only have 91 octane and plan to take the Camaro with me. Should I leave the 93 tune and use an additive or get it tuned for 91? Also does the car need to have 91 octane fuel in it to be tuned to run with it? Thanks

Jsafe17 · 10-04-2015, 05:43 PM

Imho... the difference would be negligible

ecreps · 10-04-2015, 05:50 PM

Get it tuned on 91 imo. Might lose 5-10hp, but you don't want to risk having detonation.

JCunningham · 10-04-2015, 10:10 PM

get it tuned for 91. Yes it needs to have all 91 in it to be tuned. put 3 tanks of 91 through it befor the tune to make sure. just dont be getting on it with the 91 and you will be fine.

ksmrz · 10-04-2015, 11:06 PM

I'd have a a degree or 2 pulled out under wot areas at the minimum but really it depends how aggressive it is to begin with.

zebra · 10-04-2015, 11:22 PM

what's the elevation difference between where it was tuned & where you're moving?
the rule of thumb for octane is 1 point per 2500', so 93 at sea level essentially runs about the same as 91 at 5000'. that said, you should still be able to drive it fine, but it's much safer & will be more efficient to retune it.

376LS3 · 10-04-2015, 11:27 PM

I moved from 93 to 91 and my car knocked like a mother. Just listen after a couple fill ups. If you dont hear anything, youre prolly safe. But Id bet money youll need to retune.

GONIF · 10-05-2015, 12:21 PM

Retune with 91 in the area you live with a good tuner who knows what he is doing.

JLBIII · 10-06-2015, 05:17 PM

The altitude of Maine isn't too much different than here in Pa. My tune is fairly aggressive so I'll get it tuned for 91 before I would move. I'll just have to find a station around here that has 91 instead of 93. I think Sunoco carries it. I might talk to Ted Jannetty about a tune since we travel thru Waterbury on our way to Maine.
Thanks for all the replies!

zebra · 10-06-2015, 07:55 PM

Quote:

Originally Posted by JLBIII

The altitude of Maine isn't too much different than here in Pa. My tune is fairly aggressive so I'll get it tuned for 91 before I would move. I'll just have to find a station around here that has 91 instead of 93. I think Sunoco carries it. I might talk to Ted Jannetty about a tune since we travel thru Waterbury on our way to Maine.
Thanks for all the replies!

if you can't find 91 there, technically, you can take your gas tank capacity & add half of that in 89 then fill the rest with 93... but it's way easier to just look up a station that carries 91.

10-04-2015, 10:27 AM	#1
JLBIII Drives: 2010 RJT 2SS Join Date: Dec 2009 Location: SE Penn. Posts: 175	91 Octane in 93 Octane tune Currently live in Pa where we have 93 octane. My Camaro has a LS3 conversion tuned for 93 octane. I may be moving to Northern Maine next year where they only have 91 octane and plan to take the Camaro with me. Should I leave the 93 tune and use an additive or get it tuned for 91? Also does the car need to have 91 octane fuel in it to be tuned to run with it? Thanks

10-04-2015, 10:10 PM	#4
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	get it tuned for 91. Yes it needs to have all 91 in it to be tuned. put 3 tanks of 91 through it befor the tune to make sure. just dont be getting on it with the 91 and you will be fine. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1

10-04-2015, 11:06 PM	#5
ksmrz Drives: 2010 Camaro Join Date: Oct 2014 Location: wisconsin Posts: 334	I'd have a a degree or 2 pulled out under wot areas at the minimum but really it depends how aggressive it is to begin with. __________________ 2010 2SS LS3 228/235 Cam Motion custom ground cam, AI 280cc ported heads, Dynatech 1 7/8" long tubes, catless mids, CAI intake, ATI 10% UDP, CORSA cat back, Slp 160 tstat, gm 3.91s/Tru trac, EFI LIVE tuned by myself

10-04-2015, 11:22 PM	#6
zebra just can't seem to leave Drives: your mom wild!! Join Date: Oct 2008 Location: cold & windy Posts: 10,625 View My Garage	what's the elevation difference between where it was tuned & where you're moving? the rule of thumb for octane is 1 point per 2500', so 93 at sea level essentially runs about the same as 91 at 5000'. that said, you should still be able to drive it fine, but it's much safer & will be more efficient to retune it. __________________ Eve ('00 FRC): hot-air intake Rowan ('09 H3): 5spd mom-mobile Penny ('99 Sierra): 5.3 / HD 5spd... gone but not forgotten Samson ('18 HD): compounded 408

10-04-2015, 11:27 PM	#7
376LS3 Eh, that'll happen Drives: 2010 2SS Join Date: Apr 2012 Location: Mesa, Arizona Posts: 1,841	I moved from 93 to 91 and my car knocked like a mother. Just listen after a couple fill ups. If you dont hear anything, youre prolly safe. But Id bet money youll need to retune. __________________ 2010 Camaro SS LS3 - No Modz

10-04-2015, 05:43 PM	#2
Jsafe17 Drives: 2010 2SS/RS 6spd LS3 Join Date: Jan 2015 Location: Oregon Posts: 581	Imho... the difference would be negligible

10-04-2015, 05:50 PM	#3
ecreps Drives: 2014 1LE, 1996 z28 Join Date: May 2015 Location: United States Posts: 172	Get it tuned on 91 imo. Might lose 5-10hp, but you don't want to risk having detonation.

10-05-2015, 12:21 PM	#8
GONIF Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014 Location: The Left lane PHOENIX AZ Posts: 2,626	Retune with 91 in the area you live with a good tuner who knows what he is doing. __________________ OLD GUY FLYING FAST AND LOW

10-06-2015, 05:17 PM	#9
JLBIII Drives: 2010 RJT 2SS Join Date: Dec 2009 Location: SE Penn. Posts: 175	The altitude of Maine isn't too much different than here in Pa. My tune is fairly aggressive so I'll get it tuned for 91 before I would move. I'll just have to find a station around here that has 91 instead of 93. I think Sunoco carries it. I might talk to Ted Jannetty about a tune since we travel thru Waterbury on our way to Maine. Thanks for all the replies!