wow what a diff a little octane makes
Thread Starter
Drifting
Joined: Mar 2004
Posts: 1,873
Likes: 1
From: Savannah Ga
wow what a diff a little octane makes
Per my owners manual on my 82CE it says 87 so thats what I've been doing.Just for the heck of it I started putting in 89.I fill up when I get to half a tank so it took a little while.Man do I ever feel the difference!!!It idles better,much more responsive,even sounds better.My thoughts are this.The guy I bought the car from removed the stock exhaust and cat,replaced with 21/2" duals,put in some kind of preformance thingy.it's not really a chip.It's like a little black box that fit inline with something that looks like it goes into the FI and put two K&N air filters.Thats all thats been done to an otherwise stock 38,000 mile engine.I'm thinking that just those mods made it want more octane.What is your take on this?I know I'm not going back to 87 thats for sure.
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
Octane levels in gasoline cannot affect any of the things you mention one way or the other - it can only delay the onset of preignition. Your engine is not indanger of preignition at any of the conditions you mention.
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
Race Director
Joined: Mar 1999
Posts: 10,258
Likes: 1
From: Calif.
Originally Posted by Mike Ward
Octane levels in gasoline cannot affect any of the things you mention one way or the other - it can only delay the onset of preignition. Your engine is not indanger of preignition at any of the conditions you mention.
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
Instructor
Joined: Jan 2005
Posts: 117
Likes: 0
From: OKLAHOMA CITY OKLAHOMA
You know Ive been thinking that if the guy before used high octain gas and tuned the car,carb,timing -you would notice a big diff cuz its tuned to be what we used to call an octaine hog.
Safety Car
Joined: Oct 2004
Posts: 3,725
Likes: 5
From: Minnesota
Originally Posted by Mike Ward
Octane levels in gasoline cannot affect any of the things you mention one way or the other - it can only delay the onset of preignition. Your engine is not indanger of preignition at any of the conditions you mention.
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
One other possibility is that I've been told the higher octane gas sometimes has more of the additives like detergents in it.
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
The heat might be the issue. My L48 ran a LOT better when it was cooler than when it got hot. The difference was very noticable from 180 as opposed to 210 degrees.
Racer
Joined: May 2004
Posts: 315
Likes: 0
From: North Richland Hills TX
I personally feel that it does make a difference...1st, when I use the lowest octane, when I stop my car will preiodically sputter when I turn it off...major carb rattle..plus it just SEEMS smoother when I accelerate w/ higher octane...I have swapped between them time and time again and I still adhere to this proclomation... 
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Thread Starter
Drifting
Joined: Mar 2004
Posts: 1,873
Likes: 1
From: Savannah Ga
thats what I'm talking about Buck.Before this gets into a science project we might want to take into effect the low mileadge of the engine and the not drivin'hard and put away wet thing and consider carbon build up causing more compression hence the need for more octane.I don't know.I do know that it runs better.I didn't notice it right off the bat but after a full tank of 89 was into the system I sure did.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Originally Posted by Mike Ward
Octane levels in gasoline cannot affect any of the things you mention one way or the other - it can only delay the onset of preignition. Your engine is not indanger of preignition at any of the conditions you mention.
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
Octane can not make that much of a difference.
Instructor
Joined: Jan 2005
Posts: 117
Likes: 0
From: OKLAHOMA CITY OKLAHOMA
Originally Posted by Joe Buck
I personally feel that it does make a difference...1st, when I use the lowest octane, when I stop my car will preiodically sputter when I turn it off...major carb rattle..plus it just SEEMS smoother when I accelerate w/ higher octane...I have swapped between them time and time again and I still adhere to this proclomation...
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Everybody needs to remember, 82's are computer controlled, fuel injected... No carbs to adj...
The higher octane is pinging less, 82's have a knock sensor, so Copter is probably getting more advanced timing with less ping...
The higher octane is pinging less, 82's have a knock sensor, so Copter is probably getting more advanced timing with less ping...
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Originally Posted by Mike Ward
Octane levels in gasoline cannot affect any of the things you mention one way or the other - it can only delay the onset of preignition. Your engine is not indanger of preignition at any of the conditions you mention.
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
There is some other factor at work here. Then again, I had an over active imagination at one time too and wanted to believe that expensive gas worked better than cheap gas.
Let the flames begin!
I experienced the same thing in reverse years ago during the energy crisis when I accidently got tank of regular in a 70 LS-5.. Almost undrivable.. I had to give the gas to a friend.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
for all the reasons stated both pro and con on this issue..all i can say is it made a huge diference on my L48 126k dog motor! and on my new stuff i'm starting off with sunoco 93 and tuning specifically to that gas.....
Safety Car
Joined: Oct 1999
Posts: 4,101
Likes: 10
From: NorCal
Originally Posted by Desertdawg
Everybody needs to remember, 82's are computer controlled, fuel injected... No carbs to adj...
The higher octane is pinging less, 82's have a knock sensor, so Copter is probably getting more advanced timing with less ping...
The higher octane is pinging less, 82's have a knock sensor, so Copter is probably getting more advanced timing with less ping...
Hans
Le Mans Master
Joined: Dec 2001
Posts: 5,706
Likes: 552
From: St. Peters MO
C7 of Year Finalist (stock) 2019
2018 C7 of Year Finalist
<<<The guy I bought the car from removed the stock exhaust and cat,replaced with 21/2" duals, put in some kind of performance thingy. It's not really a chip. It's like a little black box that fits inline with something that looks like it goes into the FI>>>
The previous owner probably installed this device. I am posting a question about it to get some responses.
Throttle Performance Switch
The previous owner probably installed this device. I am posting a question about it to get some responses.
Throttle Performance Switch
Last edited by 2K14C7; Jan 26, 2005 at 11:25 AM.
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
ahh, there ya go. I didn't know that year had a knock sensor. Am I right to assume that the ignition will advance the spark as much as possbile (or conversely, retard it as much as required) depending on detonation, which can be affected by octane?
I know if I advance my timing as much as possible on 93 octane, I'll get detonation on 89 or 87 because I have no knock sensors.
I know if I advance my timing as much as possible on 93 octane, I'll get detonation on 89 or 87 because I have no knock sensors.
Burning Brakes
Joined: Nov 2004
Posts: 1,028
Likes: 0
From: San Antonio Texas
i have a 94 chevy P/U with 500,000 (count 'em) miles on it. it still runs fine on 93 octane. but let me put a tank of 87 in it and it'll sputter and cough all the way home. dies when i come to a stop at every light. i believe in OCTANE.