99 Octane
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From: Lake Elsinore, CA
I put 1/4 tank of 100 octane a couple of weeks ago to stop the detonation I was starting to get because of the heat/humidity. Normally I don't get any but it was in the mid-90's here and was over the limit for the high compression I run. Worked like a charm.
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St. Jude Donor '03-'04
Cruise-In 1-2-3-4-5 Veteran
It's 'racing fuel', DV. It's used in high-compression engines and in turbocharged and supercharged engines to allow higher boost without detonation.
You're lucky to have it on tap...but be sure it's not leaded race gas.
You pretty much have to fill up with it to get a measurable performance (HP) benefit, because the dilution of 99 octane with any significant amount of normal 91/92/93 octane drops you right back down in the octane numbers.
You're lucky to have it on tap...but be sure it's not leaded race gas.
You pretty much have to fill up with it to get a measurable performance (HP) benefit, because the dilution of 99 octane with any significant amount of normal 91/92/93 octane drops you right back down in the octane numbers.
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From: Lake Elsinore, CA
Actually, the dilution in various proportions is a great way to eliminate detonation without having to fill up with an entire tank of the high octane, expensive stuff. The reason I only put in 1/4 tank is it brought me up to ~94.75 octane which I figured would be just enough to eliminate the knock, which it did. I knew I only needed a small bump in octane to accomplish this so buying a full tank of 100 would have been a waste. Using octane in excess of what it takes to avoid detonation is a waste of money. 
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From: Indianapolis IN
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Originally Posted by dallasvette
I saw 99 Octane at the pump the other day. At 5 bucks a gallon i wouldnt fill up with it but, why and what is that high octane used for?
thanks
thanks
Racer
Joined: Jul 2004
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From: Greenville SC
Originally Posted by Patches
I put 1/4 tank of 100 octane a couple of weeks ago to stop the detonation I was starting to get because of the heat/humidity. Normally I don't get any but it was in the mid-90's here and was over the limit for the high compression I run. Worked like a charm.
Thanks,
JCR_Indy
Indianapolis area
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From: Lake Elsinore, CA
A Shell gas station I drive by every day has always carried at least 100 octane. They carried 105 for a while. They call it racing gas which is pretty much what it's used for by those buying it there. I usually see guys that look like they're headed to the track filling up with it.
There are a few stations in this general area that carry high octane gas. At Commerce, the dragstrip on the other side of town, they usually have a trailer with 100, 105, 110 and even higher octane fuel available for the hi-comp motors guys show up with.
There are a few stations in this general area that carry high octane gas. At Commerce, the dragstrip on the other side of town, they usually have a trailer with 100, 105, 110 and even higher octane fuel available for the hi-comp motors guys show up with.
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When I lived in Germany, I used to fill up my bimmer with 98 octane at Esso or BP on the autobahn...it worked out to about $4.25 a gallon depending on the price per litre and DM to $ exchange rate. I didn't need it around town, but I found that on extended trips cross country, driving 240/250 KPH all day, it made a huge difference in the way the engine ran. Tended to run cooler and gas would last longer...about 1:10 per tank versus :45 mins on the 93.
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From: .... NJ
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Originally Posted by Joe Diver
When I lived in Germany, I used to fill up my bimmer with 98 octane at Esso or BP on the autobahn...it worked out to about $4.25 a gallon depending on the price per litre and DM to $ exchange rate. I didn't need it around town, but I found that on extended trips cross country, driving 240/250 KPH all day, it made a huge difference in the way the engine ran. Tended to run cooler and gas would last longer...about 1:10 per tank versus :45 mins on the 93.
Le Mans Master
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From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
[QUOTE=Patches At Commerce, the dragstrip on the other side of town, they usually have a trailer with 100, 105, 110 and even higher octane fuel available for the hi-comp motors guys show up with.[/QUOTE]
If you're running cats, you have to make sure it doesn't have lead. It'll kill them. Years ago, we would use 130 AvGas and cut it with Amoco 94 in the Drag Cars.
If you're running cats, you have to make sure it doesn't have lead. It'll kill them. Years ago, we would use 130 AvGas and cut it with Amoco 94 in the Drag Cars.
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It's race gas for use at the track. That's about the only time I could afford to run it. Bet the car doesn't ping on that stuff.
Team Owner
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From: Lake Elsinore, CA
Originally Posted by sxe60
If you're running cats, you have to make sure it doesn't have lead. It'll kill them. Years ago, we would use 130 AvGas and cut it with Amoco 94 in the Drag Cars.
What they sell at Commerce is unleaded. I know there are some guys that use leaded aviation fuel not realizing it has lead in it.
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St. Jude Donor '03-'04
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Did you start with 93 and 100, Patches? My dilution calc doesn't come to 94.75 when I use 92 and 99...
But I understand your point - use what you need to prevent detonation and don't go overboard.
I do wish I could find unleaded high-octane here in Nashville, but so far it's only available at the speedway. The local Marathon stations still carry 118 Leaded around back.
But I understand your point - use what you need to prevent detonation and don't go overboard.
I do wish I could find unleaded high-octane here in Nashville, but so far it's only available at the speedway. The local Marathon stations still carry 118 Leaded around back.
Team Owner
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From: Lake Elsinore, CA
Right. I use 93 and 100. You should end up with 93.75 with 3/4 of 92 and 1/4 of 99. Maybe you can come down here and tow a tank to take some back with you. 
Last edited by Patches; Aug 13, 2004 at 06:18 PM.
Le Mans Master
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From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Anybody using octane booster additives? Used to use them in hi-compression carb engines, but I wonder what they'd do to fuel injection and plastic gas tanks. 
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From: Lake Elsinore, CA
JBS sells Torco. Check it out and contact him for more info.
http://www.jbsblownc5.com/html/torco.html
http://www.jbsblownc5.com/html/torco.html
Safety Car
Joined: Dec 2003
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From: Sarver Pennsylvania
Patches,
thanks for taking the time to explain what it all should mean to anybody pulling up to the pumps!
I used to get Sunoco "260" that was rated at "104" for my GTO and my friends really got on me for bothering to pay that much for gas. And that was when it was $.40 a gallon!!
If you're driving around, get whatever it takes to keep the car from knocking. Anything more is just a waste of YOUR cash!
thanks for taking the time to explain what it all should mean to anybody pulling up to the pumps!
I used to get Sunoco "260" that was rated at "104" for my GTO and my friends really got on me for bothering to pay that much for gas. And that was when it was $.40 a gallon!!
If you're driving around, get whatever it takes to keep the car from knocking. Anything more is just a waste of YOUR cash!
Melting Slicks
Joined: Jun 2002
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From: Middletown CT
Here's a link to a couple charts that tell you what octane you will have when blending 100 and 93 , 100 and 92, or 100 and 91 octane. I keep a copy in the glove box.
http://www.76.com/products/76racing.asp#OCTANE
In my area I can buy Turbo Blue 100, Sunoco 100, or CAM II at the pump. The Sunoco and CAM II are the same gas, I think. They market it as CAM II and sell it at non-Sunoco gas stations.
http://www.76.com/products/76racing.asp#OCTANE
In my area I can buy Turbo Blue 100, Sunoco 100, or CAM II at the pump. The Sunoco and CAM II are the same gas, I think. They market it as CAM II and sell it at non-Sunoco gas stations.
Last edited by Greg_E; Aug 13, 2004 at 09:26 PM.
