87 octane
Thread Starter
Cruising
Joined: Mar 2018
Posts: 12
Likes: 2
87 octane
stingray manual says 93 octane is recommended, not required. Says 87 octane is acceptable. I don’t track my car, it’s a daily driver. What is the harm in running 87 octane in it? I say it will not harm the engine, only limit the performance.
Team Owner
Joined: Jan 2007
Posts: 29,059
Likes: 1,837
From: cookeville tennessee
If you really get into the paddle really hard for a period of time you would get knock I would say being this motor is 11:7:1 comp. Robert
Instructor
Joined: May 2018
Posts: 129
Likes: 55
From: N Va Va
I don't understand this thinking. I DD mine too 80 miles a day so it's not a garage queen.
You buy a high performance car for 60k then worry about 20 cents a gallon more for gas ?? Think about it. Let's say you fill it up and put 13 gallons in. 20 cents more a gallon $2.60 difference between 87 and 93..... I bet you spend more than that on a cup of coffee in the morning.
You buy a high performance car for 60k then worry about 20 cents a gallon more for gas ?? Think about it. Let's say you fill it up and put 13 gallons in. 20 cents more a gallon $2.60 difference between 87 and 93..... I bet you spend more than that on a cup of coffee in the morning.
Race Director
Joined: May 2001
Posts: 15,320
Likes: 2,069
From: Guelph, Ontario
87 octane plus hot weather plus full throttle is a recipe for disaster. Don't cheap out on the gas, stick with the good stuff. And try to run nothing but Top Tier while you're at it also.
Thread Starter
Cruising
Joined: Mar 2018
Posts: 12
Likes: 2
FYI aim in California and 93 is virtually not available, although there are 2 stations with 100 racing fuel...at 9.xx a gallon
Pro
Joined: May 2017
Posts: 518
Likes: 184
From: Machesney Park IL
how do I determine top tier. I know I can expect good additives in Chevron, Mobil, Shell; but should I assume Costco (don’t laugh) dos NOT have the best gas?
FYI aim in California and 93 is virtually not available, although there are 2 stations with 100 racing fuel...at 9.xx a gallon
Do you have 91 available?
Race Director
Joined: May 2001
Posts: 15,320
Likes: 2,069
From: Guelph, Ontario
how do I determine top tier. I know I can expect good additives in Chevron, Mobil, Shell; but should I assume Costco (don’t laugh) dos NOT have the best gas?
FYI aim in California and 93 is virtually not available, although there are 2 stations with 100 racing fuel...at 9.xx a gallon
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Instructor
Joined: Nov 2015
Posts: 167
Likes: 54
From: Lumberton Texas
I don't understand this thinking. I DD mine too 80 miles a day so it's not a garage queen.
You buy a high performance car for 60k then worry about 20 cents a gallon more for gas ?? Think about it. Let's say you fill it up and put 13 gallons in. 20 cents more a gallon $2.60 difference between 87 and 93..... I bet you spend more than that on a cup of coffee in the morning.
You buy a high performance car for 60k then worry about 20 cents a gallon more for gas ?? Think about it. Let's say you fill it up and put 13 gallons in. 20 cents more a gallon $2.60 difference between 87 and 93..... I bet you spend more than that on a cup of coffee in the morning.
And not sure where you get $0.20 more? 93 is +$0.60 more than 87 in Texas. Fill up with 16 gallons of gas is an extra $9.60. 1 tank of gas per week is $500 more a year. OP wants to know if this extra money is worth it?
OP, My thoughts are stay away from possible detonation from the higher compression from running 87. I usually run 93 but do not hesitate to fill up with 89. I will not risk anything with 87 though for the little savings it provides..
Last edited by LBRc7; Jun 9, 2018 at 01:37 AM.
Racer
Joined: Jun 2017
Posts: 388
Likes: 73
From: Idaho
You can use 87 but the PCM will switch progressively to the low octane table because of knock retard.
There is a knock learn factor which is a value Between 0 and 1, depending how much knock the car sees.
Then the pcm makes an average of high octane and low octane tables based of the knock learn factor.
The timing on the low octane table sucks, between 15 and 20 degrees less.
I wouldn’t run 87 unless emergency and would avoid full throttle. You won’t break anything though, because of all built in safeties.
How do I know that ? Because I’m tuning myself my bolts on GS with HP tuners
There is a knock learn factor which is a value Between 0 and 1, depending how much knock the car sees.
Then the pcm makes an average of high octane and low octane tables based of the knock learn factor.
The timing on the low octane table sucks, between 15 and 20 degrees less.
I wouldn’t run 87 unless emergency and would avoid full throttle. You won’t break anything though, because of all built in safeties.
How do I know that ? Because I’m tuning myself my bolts on GS with HP tuners
Last edited by Nabush; Jun 9, 2018 at 09:57 AM.
Le Mans Master
Joined: Oct 2014
Posts: 8,662
Likes: 2,722
From: Atlanta GA
But again I digress , did we really buy a $60,000 to over $100,000 dollar performance car to worry about saving $500.00 a year on fuel .... if that's the case then you really bought the wrong car .....
Dave
Dave
Melting Slicks
Joined: Nov 2007
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From: Pittsburgh PA
St. Jude Donor '10-'11-'12-'13-'14
Johncarter: I hate to see someone new to Corvette Forum get a bad impression. The Forum is actually a great resource and most replies are not rude. But it's still an Internet forum - so maintain a thick skin and continue to participate.
Pro
Joined: May 2017
Posts: 518
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From: Machesney Park IL
Dont do that. Most on here are good folks. Internet is public, so at times you get people who are not the most friendly and the anonymity allows them to be jerky when in person they wouldnt say a word.
Instructor
Joined: May 2018
Posts: 129
Likes: 55
From: N Va Va
Originally Posted by LBRc7
Should have known someone would chime in with this nonsense..
And not sure where you get $0.20 more? 93 is +$0.60 more than 87 in Texas. Fill up with 16 gallons of gas is an extra $9.60. 1 tank of gas per week is $500 more a year. OP wants to know if this extra money is worth it?
OP, My thoughts are stay away from possible detonation from the higher compression from running 87. I usually run 93 but do not hesitate to fill up with 89. I will not risk anything with 87 though for the little savings it provides..
And not sure where you get $0.20 more? 93 is +$0.60 more than 87 in Texas. Fill up with 16 gallons of gas is an extra $9.60. 1 tank of gas per week is $500 more a year. OP wants to know if this extra money is worth it?
OP, My thoughts are stay away from possible detonation from the higher compression from running 87. I usually run 93 but do not hesitate to fill up with 89. I will not risk anything with 87 though for the little savings it provides..
Nonsense ?? So the OP buys a C7 for what, to commute ? And then worries about gas prices ? Wow ...
Last edited by Black18C7; Jun 9, 2018 at 10:00 PM.
Instructor
Joined: May 2018
Posts: 129
Likes: 55
From: N Va Va
Originally Posted by Dcasole
But again I digress , did we really buy a $60,000 to over $100,000 dollar performance car to worry about saving $500.00 a year on fuel .... if that's the case then you really bought the wrong car .....
Dave
Dave
Instructor
Joined: Nov 2015
Posts: 167
Likes: 54
From: Lumberton Texas
Drifting
Joined: Jul 2012
Posts: 1,323
Likes: 239
From: Missi'ppi... no mo' MO for me!!
Over here in Mississippi, it's 70-80 cents more per gallon. In CA, it's 20 cents more from regular to premium, but ~70 cents more per gallon than MS pricing. If I was DD in CA, it might be something I'd consider, but since I like to hammer it, I pay the freight. It helps that I rarely let the tank fall to 1/4 full; it doesn't seem to hurt as bad at each fillup. Also, I don't wait til I have to have gas; I'll refill whenever I'm near 1/2 and see a good price. Sometimes that can save 10-15 cents per gallon.