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Old 03-30-2009, 10:33 PM   #1
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Regular vs Premium

It's been said the SS V-8's will run fine on regular. What performance decrease will there be when using regular vs premium and if used regularly will regular harm the engine. Does anybody know?
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Old 03-30-2009, 10:35 PM   #2
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The only time you'd need to run premium is if you change the tune to a 93 octane b/c of an induction change. If you're running the factory tune then paying for the more expensive gas is a waste. Essentially, regular gas will do fine.
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Old 03-30-2009, 10:39 PM   #3
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the thing with reg. unlead is that the octane rating has to be atleast 87 but it can be as high as 93. and often is. i ran regular in several cars i have had that called for premium
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Old 03-30-2009, 10:40 PM   #4
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This was asked in a previous thread.

But! The cost difference really is not that big... at most 25 cents more a gallon. Let's asume a 18 gallon tank, (just a guess, my FJ is 16.# something) $4.50 a tank.

Unless you fill up every other day, it's worth the extra expense. If you're getting a SS I would get the higher octane.
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Old 03-30-2009, 10:42 PM   #5
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Higher octane = higher burn = more HP
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Old 03-30-2009, 10:47 PM   #6
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Originally Posted by kopacko View Post
Higher octane = higher burn = more HP
pardon????

The function of a higher octane gasoline is to delay the flame propogation or 'burn' to prevent detonation. I'm not sure about the L99, but the LS3 will have a 92+ octane recommendation.....just like the corvette. Sure, there will be no problem running a lower octane gas......any detonation, or ping will be picked up by the knock sensors and the computer will dial back the ignition timing....but you will definitely not get all of those 420+ horses!!

So, performance affected with regular gas, definitely, engine longevity affected with regular gas, definitely not......
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Old 03-30-2009, 10:48 PM   #7
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The only time you'd need to run premium is if you change the tune to a 93 octane b/c of an induction change. If you're running the factory tune then paying for the more expensive gas is a waste. Essentially, regular gas will do fine.
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Old 03-30-2009, 10:54 PM   #8
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Originally Posted by kopacko View Post
Higher octane = higher burn = more HP
WTF? Research. Higher octane = slower burn
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Old 03-30-2009, 10:58 PM   #9
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Sorry, meant higher energy to burn...not higher burn too fast for my own typing.
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Old 03-30-2009, 11:03 PM   #10
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Sorry, meant higher energy to burn...not higher burn too fast for my own typing.
Sorry for the flame. This has been talked about here at great length, some with knowledge and some without. Search, you will find. Some are even funny.
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Old 03-30-2009, 11:05 PM   #11
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Yea eventually might need a 5th gen specific Octane guide. Basically use unleaded in the V6 and Super in the SS.
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Old 03-30-2009, 11:10 PM   #12
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why not use reg and a bottle of octane boost? I run 87 in my Trailblazer SS it calls for premium but runs fine on the 87. I can definately tell a difference if I run the 93 in performance (and maybe mileage) but I can't tell for sure because my wife drives it too and she always seems to burn gas faster than I do and she says I drive fast...lol
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Old 03-30-2009, 11:28 PM   #13
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You ever notice the scam at the pumps were the 93 is like 60 cents a gallon more then the regular because they know most people look at the lowest price on the sign (also always on the top of the sign) as they pull in. You know it's a scam because then you see the guy down the block foe 12 cents more, but everyone starts the regular price very close to each other!
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Old 03-30-2009, 11:31 PM   #14
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In the LS1 running lower octane is fine for the engine but the computer retards the timing, so you lose power. No engine damage though. I just can't bring myself to save $3.00 per tank when I know it will cost me performance. I usually drive pretty calm but I do get on it at least a few times per tank.
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Old 03-30-2009, 11:52 PM   #15
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I wonder what would happen if I put 110 Octane into an LS3..

... Would I reach the moon? (Has access to 110 and Jet A..)
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Old 03-31-2009, 12:00 AM   #16
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Quote:
Originally Posted by VTXrider View Post
In the LS1 running lower octane is fine for the engine but the computer retards the timing, so you lose power. No engine damage though. I just can't bring myself to save $3.00 per tank when I know it will cost me performance. I usually drive pretty calm but I do get on it at least a few times per tank.
Someone mentioned in another thead that when you switch abck to higher octane the engine readjusts to teh correct timing ?

Also, in the same thread i beleev Fbod or someone mentioned that although using 93 octane costs more at teh pump, the cost is offset by getting the correct mileage by using the 'recommended fuel for best performance' 9as it says in the manual)
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Old 03-31-2009, 12:42 AM   #17
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I got to go with premium for the performance... Cmon you woudent want to loose any hp. I would want every bit of the 426hp!!
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Old 03-31-2009, 12:52 AM   #18
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I got to go with premium for the performance... Cmon you woudent want to loose any hp. I would want every bit of the 426hp!!
Yup like I said, to me it's worth the few bucks a fill up, I fill up every third day (I have a 100 mile round trip to work and back and get 300 miles on a 16 gallon tank) it's worth it to me, I can tell the difference in performance, and I do actually get a little better mileage with premium.
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Old 03-31-2009, 12:55 AM   #19
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I always run the good stuff in my Harley, but then I'm only filling up 4.5 gallons at a time... lol

The Camaro won't be a daily driver either, so it will always get the good stuff too !!!!!
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Old 03-31-2009, 01:20 AM   #20
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The higher the octane, the slower the combustion burn (less volatile). When you use a higher octane, the engine computer (ECM) can keep pushing the ignition timing advance for more horsepower.

Detonation (pinging) occurs when the combustion burn is too fast and the explosion of combustion slams down on the still coming up piston.

Most GM V8's have been using ESC (Electronic Spark Control) for many years. It uses a piezo-electric microphone to listen for detonation, and when it hears a certain amount (ECM see's this as a voltage from mic) it will back off the advance.

It uses an intricate logarithm you wouldn't beleive.

So, the higher the octane - the more spark advance and horsepower. As long as the engine uses ESC or similar.

We get 93 in Florida, that's all my Camaro will ever see. Ethanol does boost octane ratings, too.

Throw a can 104 octane boost (any auto parts store) in the gas tank and hold on!

Or you can use lower octane (more volatile) - and have less horsepower, and the resulting lower mpg.

Premium pays for itself by increasing fuel mileage on many vehicles. Corvette C6 owners have confirmed this fact.
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Old 03-31-2009, 02:22 AM   #21
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Quote:
Originally Posted by shockandawe View Post
It's been said the SS V-8's will run fine on regular. What performance decrease will there be when using regular vs premium and if used regularly will regular harm the engine. Does anybody know?
DO not run on regular if you have Ls3 at least. I've seen ppl do it in ls2 and it makes the engine knock pretty bad!!!
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Old 03-31-2009, 02:25 AM   #22
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I wonder what would happen if I put 110 Octane into an LS3..

... Would I reach the moon? (Has access to 110 and Jet A..)
Tried it in an ls2. It doesn't make that big a difference unless you are tuning to it. It won't give you nearly as much increase as in an FI car either even with tune.

IT runs super smooth though!
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Old 03-31-2009, 04:42 AM   #23
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And there is a grade in between the two. Use midgrade if you can't afford the good stuff. It will be better than the lowest grade.
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Old 03-31-2009, 07:28 AM   #24
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most places around here you can't get the mid grade any more (kind of weird) it is either 87 or 92/93
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Old 03-31-2009, 07:37 AM   #25
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Once the PCM pull's timing to correct for knock the damage is already done. The ls3 doesn't have an octaine sensor like the GP GXP and Impalla SS did. It can only react to the combustion event. It blows my mind why people wil but a nice car and then struggle to find a way to power it with cheap shitty gas. You looking at about 200 bucks a year difference in overal cost of ownership and more than likley you will loose more than that with MPG losses.
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