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03-21-2017, 07:32 PM
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#1 |
 Drives: 2017 2SS Camaro Fifty Join Date: Mar 2017
Location: Odessa, TX
Posts: 58
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91 vs 93 octane
I have a feeling this has been hashed to death, but I did a search and couldn't find anything.
Very difficult to find 93 Octane out here in West Texas. What kind of harm am I doing using 91? I've actually been a little worried about going WOT with the 91 in it so far...
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03-21-2017, 07:37 PM
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#2 |
   
Drives: 2017 2SS Join Date: Mar 2012
Location: Rolla, MO
Posts: 1,106
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You'll be fine
Some stations have 93, but sometimes you can't find it. 91 is still "premium" as far as Octane is concerned.
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1996 Corvette - LT4
2017 Camaro 2SS 2019 GMC Sierra 2500 HD 2015 Harley Davidson Ultra Limited |
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03-21-2017, 07:41 PM
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#3 |
 Drives: Mitsubishi Evolution X Join Date: Nov 2016
Location: NY/NJ/CT Tri-State
Posts: 228
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On the engine sub forum, they claim the engine is tuned very close to the line (aggressive) timing wise for 93. But, yes, it'll adjust for 91.
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03-21-2017, 07:46 PM
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#4 |
      Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,558
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You only do harm if the engine manages to knock. If it does knock, that will be detected by the knock sensor, and the engine control module will retard spark timing. This will happen so fast you probably won't notice it.
Driving on 91 may mean you never realize 100% of engine power, but it is probably good enough to get you to 99.9%. You would probably need controlled conditions to measure any difference. The engine geometry and fuel maps are optimized for 93 and that will give best power and fuel economy, but you are close enough. 92 is what I have here at most stations in south Jersey. |
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03-21-2017, 07:53 PM
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#5 | |
Drives: 1969 Mustang MaCh1 Join Date: Nov 2015
Location: SJ
Posts: 835
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Quote:
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03-21-2017, 09:56 PM
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#6 |
Drives: 2013 Camaro convertible 2SS/RS Join Date: Sep 2014
Location: Southern NH
Posts: 1,077
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Does the manual say 93 or does it say premium? Premium in most states is 91. I know Ford specifically says 93 to get most hp.
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03-22-2017, 08:46 AM
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#7 |
 
Drives: 2017 Camaro SS 1LE Join Date: Nov 2015
Location: Atlanta, GA
Posts: 148
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Just switch to E85
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03-22-2017, 08:49 AM
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#8 | |
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Drives: 2017 2SS Camaro Fifty Join Date: Mar 2017
Location: Odessa, TX
Posts: 58
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Quote:
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03-22-2017, 08:52 AM
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#9 | |
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Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016
Location: Norman, OK
Posts: 2,424
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03-22-2017, 12:35 PM
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#10 |
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Drives: 2013 Camaro convertible 2SS/RS Join Date: Sep 2014
Location: Southern NH
Posts: 1,077
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Just looked up the manual for the SS, and it recommends premium 91 or higher. So its not specific to 93 like the Mustang.
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03-22-2017, 02:11 PM
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#11 | |
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Drives: 2017 2SS Join Date: Mar 2012
Location: Rolla, MO
Posts: 1,106
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Quote:
You can find 93 around here, but most places only have 91. 91 will not cause any issues. Straight out of my 2017 owners manual:
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1996 Corvette - LT4
2017 Camaro 2SS 2019 GMC Sierra 2500 HD 2015 Harley Davidson Ultra Limited |
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03-22-2017, 02:34 PM
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#12 |
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Would 91 non-ethanol be better to use than 93 with 10% ethanol?
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03-22-2017, 02:43 PM
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#13 | |
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Drives: 2013 Camaro convertible 2SS/RS Join Date: Sep 2014
Location: Southern NH
Posts: 1,077
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Quote:
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03-22-2017, 03:47 PM
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#14 | |
 
Drives: '17 2SS 50th Join Date: Sep 2016
Location: Southeast
Posts: 422
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Quote:
I guess 91 100% gasoline would be better for the engine, while the 93 10% ethanol would be better performance-wise.
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