Yes, 50 bucks of the 100 Octane Gas, Please.

[David JP]

Has anyone here tried 100 octane gas, and if so, what are your
thoughts, pro and con?

Also, is it available in the tri-state area?

[CRUZTAKER]

I tried the 100 proof in Ennis at the track with no noticable improvement. But that's just me...I have little experience with race fuels and am looking forward to further replies to this thread.

[TAF]

I'm not the best to speak on the specifics of this, but...I've been told "race gas" will ruin your cats.

Maybe some others with more knowledge of the specifics can chime in, or prove me wrong.

[Smokie]

Has anyone here tried 100 octane gas, and if so, what are your
thoughts, pro and con?

Also, is it available in the tri-state area?Just some thoughts until the real experts chime in. If you are referring to what is available at a race track, it comes in two flavors leaded and unleaded, if you use leaded, your cats will be ruined. If you use 100 octane unleaded, nothing much will happen unless your computer has been programmed to take advantage of the high octane rating and therefore a waste of your money.

Here is a link you might find useful:
http://www.racegas.com/

[Cobra25]

Since we are on the Topic of Gasoline, Has anybody noticed if their cars run better on certain brands of 93 oct. gasoline than others.

[TAF]

Since we are on the Topic of Gasoline, Has anybody noticed if their cars run better on certain brands of 93 oct. gasoline than others.
I ONLY run BP/Amoco 93 in mine...tried another once and there was a NOTICEABLE difference!

[MapleLeafMerc]

Has anyone here tried 100 octane gas, and if so, what are your
thoughts, pro and con?

Also, is it available in the tri-state area?

The best I've found so far is Sunoco 94. Pioneer (an indy dealer) has 93. Esso, Shell, Petro-Can all have just 89-91. I like to think the 94 is better than the 89; maybe it isn't.

Good question!

[jgc61sr2002]

I ONLY run BP/Amoco 93 in mine...tried another once and there was a NOTICEABLE difference!
What Todd said. ^^^^

[RF Overlord]

If you use 100 octane unleaded, nothing much will happen unless your computer has been programmed to take advantage of the high octane rating and therefore a waste of your money.

Smokie is absolutely correct...our motor is designed to run on 91 octane fuel... Jerry's (Dennis's) programming bumps that requirement up to 92 or 93...using a gasoline with an octane rating well in excess of what the motor requires (i.e. 99 or 100LL or what have you) is simply a waste of money as it will produce no noticeable improvement in performance. In fact it may even REDUCE performance slightly as higher octane fuels burn slower and have lower BTUs (energy content)...using 99 octane fuel in a Marauder, unless it's HEAVILY modified (higher compression, altered valve timing, significantly advanced spark timing, etc.) is as useless as running 91 octane in a motor designed for 87.

A fuel's octane rating is NOT a measure of its performance ability, it is simply a measure of its resistance to detonation. If your motor is not experiencing detonation/knocking/pinging with (for example) 87 octane fuel, then using 89 or 91 will NOT make the car run any better/stronger/smoother/cleaner...

[TAF]

Smokie is absolutely correct...our motor is designed to run on 91 octane fuel... Jerry's (Dennis's) programming bumps that requirement up to 92 or 93...using a gasoline with an octane rating well in excess of what the motor requires (i.e. 99 or 100LL or what have you) is simply a waste of money as it will produce no noticeable improvement in performance. In fact it may even REDUCE performance slightly as higher octane fuels burn slower and have lower BTUs (energy content)...using 99 octane fuel in a Marauder, unless it's HEAVILY modified (higher compression, altered valve timing, significantly advanced spark timing, etc.) is as useless as running 91 octane in a motor designed for 87.

A fuel's octane rating is NOT a measure of its performance ability, it is simply a measure of its resistance to detonation. If your motor is not experiencing detonation/knocking/pinging with (for example) 87 octane fuel, then using 89 or 91 will NOT make the car run any better/stronger/smoother/cleaner...
Yes...but what about "race gas" and CATS...almighty "fluid-one"....

[MapleLeafMerc]

Smokie is absolutely correct...our motor is designed to run on 91 octane fuel... Jerry's (Dennis's) programming bumps that requirement up to 92 or 93...using a gasoline with an octane rating well in excess of what the motor requires (i.e. 99 or 100LL or what have you) is simply a waste of money as it will produce no noticeable improvement in performance. In fact it may even REDUCE performance slightly as higher octane fuels burn slower and have lower BTUs (energy content)...using 99 octane fuel in a Marauder, unless it's HEAVILY modified (higher compression, altered valve timing, significantly advanced spark timing, etc.) is as useless as running 91 octane in a motor designed for 87.

A fuel's octane rating is NOT a measure of its performance ability, it is simply a measure of its resistance to detonation. If your motor is not experiencing detonation/knocking/pinging with (for example) 87 octane fuel, then using 89 or 91 will NOT make the car run any better/stronger/smoother/cleaner...

99 is a waste because the stock MM only needs 91 (diff of 8), and 89 won't help if 87 is all you need (diff of 2). Is the octane scale linear, so that differences are comparable through the range? Is the 94 I go out of my way to buy at Sunoco also a waste?

[67435animal]

Yes...but what about "race gas" and CATS...almighty "fluid-one"....

Todd, I use Race Gas in the Corvette, mixing 1 gal of 110 octane leaded fuel to 2 gallons of SU. I get around 99-100 octane which is what the motor needs. There are flavors of racing fuel that are unleaded. I have seen them at the race tracks. Commerce, for example, sells unleaded high octane fuel as well as leaded.

My racing fuel costs 5.25 per gallon. The 427 loves it and takes advantage of it.

For our motors, most will run just fine with no detonation on 91-93 SU. If the motor isn't knocking, there is no benefit to be gained from higher octane.

And, if anyone uses octane boosters, throw them away. Two things you should know:

* when the octane booster says things like 'raises octane up to 8 points!' that means raises 93 to 93.8! At 6-8.00 per little bottle that's way more expensive than my racing fuel

* also, octane boosters leave a rust colored deposit all over your upper cylinders, pistons and spark plugs

Just a caveat for those who think boosting with a booster is a good idea.

If you want to try racing gas, buy only unleaded. However, for almost all of our engines, good old pump gas will do the job. Ain't it great?

Bob

[Bigdogjim]

I ONLY run BP/Amoco 93 in mine...tried another once and there was a NOTICEABLE difference!
I on the other hand have noticed no ill effect with difference brands.

[67435animal]

99 is a waste because the stock MM only needs 91 (diff of 8), and 89 won't help if 87 is all you need (diff of 2). Is the octane scale linear, so that differences are comparable through the range? Is the 94 I go out of my way to buy at Sunoco also a waste?

Larry, yes.

Bob

[67435animal]

I on the other hand have noticed no ill effect with difference brands.

Me neither. I buy mine at Kroger! I stopped buying Amoco when I learned that their "clean" fuels destroy carburetor rubber and gasket parts.

Bob

[MERCMAN]

just a little preview of available gas in INDY!!!!

[jgc61sr2002]

The pump states" Leaded" which is NG for the cats. :(

[schuvwj]

I seem to have the best luck with BP-93 octane or Mobil 93 octane.
There is a local Shell station that has unleaded 100 octane.
I occasionally top off my tank with $20.00 dollars worth at $3.59/gal.
to cleaner her out. Gas here in ILL. is really bad sh?t. I think they add
something to it to reduce emissions but drops performance badly.

[TripleTransAm]

99 is a waste because the stock MM only needs 91 (diff of 8), and 89 won't help if 87 is all you need (diff of 2). Is the octane scale linear, so that differences are comparable through the range? Is the 94 I go out of my way to buy at Sunoco also a waste?


I used to notice optimum operation on all my V8s (sounds like a soap opera - All My V8s, followed by The Young and the Beltless) when operating on Esso's 92 octane product. However, they did away with this when they addressed their high-sulfur-content issues, and decided not to enhance their octane via MTBE. As such, I actually noticed some pinging with the new formulation, and have now begun to use Petro Canada's 94 octane. Not my favorite gas by any measure, but what's a guy to do... we don't have any Sunocos here in Quebec (they all became Ultramars in mid 90s).

Before the change, it was well observed within the local (Toronto and Montreal) F-body community that best performance was obtained out of the 92 Esso vs the 94 Sunoco. Why? Seems the Sunoco would go 'bad' awfully quick and knock up a storm, reducing power via the ignition retarding, while the Esso 92 seemed to deliver more energy per unit quantity.

A great deal of the performance results from a certain fuel has to do with the additives package... a 92 from one company may be better than the 92 from another, and in some cases a 92 from one company may outperform (in a certain engine) a 94 from another company, etc...

[MapleLeafMerc]

A great deal of the performance results from a certain fuel has to do with the additives package... a 92 from one company may be better than the 92 from another, and in some cases a 92 from one company may outperform (in a certain engine) a 94 from another company, etc...

And then throw in Petro-Can's so-called 'winter gas'! I guess the question of what makes good gasoline is as complicated as understanding why the price goes up and down!

So the Sunoco 94 is unncessary-oh well...at least they have a good car wash and give you credits toward your CAA membership!

[TripleTransAm]

So the Sunoco 94 is unncessary-oh well...

No, that's not quite what I was trying to say. Try to look at it this way... does your Marauder ping with 94? No? Then it's acceptable gas. Does it ping with 92? No? Then it too is acceptable. Does 91 ping? etc.etc.

And once you've established which fuels does not make your MM burp up, then it's a matter of seeing which one performs as far as mileage and instrumented acceleration results.

In my case, Petro Canada 94 octane IS necessary. Simply because the 91 octane alternative is unacceptable, due to pinging. But if you can get better mileage and / or better performance on a lower octane fuel without any pinging, then the higher octane fuel is unnecessary.

[junehhan]

I generally use Marathon because it's so convenient for me, but I have felt my vehicle running a bit better on Shell or Amoco when I tried those. Unfortunately, those stations are 2-3 miles away from me, and out of my daily route while the Marathon station is right next to the on-ramp onto the highway making it very convenient.

[SergntMac]

I on the other hand have noticed no ill effect with difference brands.
Ditto, and no remarkable benefit either.

[67435animal]

You answered Larry's question more completely than I did. It is a case of buying the lowest price fuel that works for your car. In some cases, fuel with the same octane rating at two different stations may cause your car to run differently.

In Georgia, all fuel must meet some specific requirements so the only differences is pretty much in the additives. We have just begun to experience low sulphur fuel here.

I buy 93 octane at the gas station at the corner, mainly because my car gets along with it and, it is lower priced than other stations.

Bob

[rookie1]

I feel obligated to point out in this thread that Citgo and Marathon are the only companies that DO NOT import oil from the middle east if that matters to anyone. it matters to me so these are my only 2 brands.

[junehhan]

I didn't realize that, but that's a good fact to remember. However, there is only a limited supply of oil, and while it may not happen in our lifetime, it's something that the entire world is eventually going to run out of.

[TripleTransAm]

However, there is only a limited supply of oil, and while it may not happen in our lifetime, it's something that the entire world is eventually going to run out of.

...and I'm sure my '78 T/A is going to play a significant role in doing so.

:lol:

[jgc61sr2002]

I didn't realize that, but that's a good fact to remember. However, there is only a limited supply of oil, and while it may not happen in our lifetime, it's something that the entire world is eventually going to run out of.
We have syntheic oil and fuel is probably not far off. :D

[Todd TCE]

Sunoco GT+

Unleaded, 104 (believe) and very oxygenated.

Trust me. :coolman:

[David JP]

Just some thoughts until the real experts chime in. If you are referring to what is available at a race track, it comes in two flavors leaded and unleaded, if you use leaded, your cats will be ruined. If you use 100 octane unleaded, nothing much will happen unless your computer has been programmed to take advantage of the high octane rating and therefore a waste of your money.

Here is a link you might find useful:
http://www.racegas.com/
Well thanks people, but I think we're still a square one.

I thought I would have to travel far to aquire 100 octane but by
chance, someone told me of a station that sold Sunoco race gas
3 miles from my home. After bowling them over and eluding the police
on a 3 mile chase through Brooklyn, I arrived at the gas station. (just kidding, of course).

$21 dollars got me little under 4 gallons added to a half tank of 93.
Driving 3 miles to meet a buddy, I felt no discernable difference.
After a burger and 2 Bass ales I felt a significant difference.

Aware of the placebo effect, I cruised around for 15 miles and I would say
that there is a positive difference, but the jury is still out.

I've read some threads here and my personal experience has taught me
that the quality of gas, oil, etc. means a whole lot in performance. When my father was ill, I drove from NY to New Orleans RT 6 times in a span of 2 years,
in a 94 Inteceptor. I really noticed the quality of gas then. My personal favorites are: (Drum role, please.....)

1. Amoco
2. Mobil
3. Shell
4. Sunoco
5. Fred Flintstone ( just won't use anything else).

[junehhan]

Depending on how our computers are programmed, it's possible that we can see performance gains with higher octane fuel. If the computer is programmed to keep advancing timing until it detects engine ping, it would depend on how far the computer has the ability to advance the timing. For instance, the new Honda Accord V6's make about 10-12 more hp on premium fuel as proved by several dyno's i've seen, even though it only requires regular 87 octane fuel. Of course, i'm not sure how much further the factory programming will advance timing when you use a higher octane gas, so that I don't know.

When i'm travelling, the only brands of gas i'll ever risk are Marathon, Shell, Texaco, Chevron, Amoco, Sunoco.