Any gas stations pumping 100 octane?
08-23-2005, 12:28 AM
#22
Le Mans Master
Originally Posted by Virt
No 93 octane pumps anywhere in CA 
If you need anything higher than 91 you'll have to mix in race fuel. 5gallons of 100 octane + 10 gallans of 91 octane gets you a tad above 93 octane.
If you need anything higher than 91 you'll have to mix in race fuel. 5gallons of 100 octane + 10 gallans of 91 octane gets you a tad above 93 octane.
total octane = ((91 X 14gallons) + (100 X 4gallons)) / 18gallons
93 = ((1274 + 400)) /18
93 = 1674 / 18
Yours would yield:
((91 X 10) + (100 X 5)) / 15 = 94
Last edited by jimman; 08-23-2005 at 12:32 AM.
08-23-2005, 11:08 AM
#24
Racer
Thread Starter
Originally Posted by jimman
Slight math problem: total Octane = (standard octane X gallons of it) + (race octane X gallons of it) / total gallons
total octane = ((91 X 14gallons) + (100 X 4gallons)) / 18gallons
93 = ((1274 + 400)) /18
93 = 1674 / 18
Yours would yield:
((91 X 10) + (100 X 5)) / 15 = 94
total octane = ((91 X 14gallons) + (100 X 4gallons)) / 18gallons
93 = ((1274 + 400)) /18
93 = 1674 / 18
Yours would yield:
((91 X 10) + (100 X 5)) / 15 = 94
That's what I had thought. But apparently octane doesn't just divide out simply like that. There is some loss in the transition.
Interesting enough, I filled up 6 gallons of 100, 9.5 gallons of 91. That should be well above 93 octane. Probably close to 94. I took my car to dyno about 3 hours later (had driven roughly 50 miles between pump and dyno shop), and I was still getting 2-3 degrees of timing pulled due to knock.
08-23-2005, 01:01 PM
#25
Le Mans Master
Originally Posted by Virt
That's what I had thought. But apparently octane doesn't just divide out simply like that. There is some loss in the transition.
Interesting enough, I filled up 6 gallons of 100, 9.5 gallons of 91. That should be well above 93 octane. Probably close to 94. I took my car to dyno about 3 hours later (had driven roughly 50 miles between pump and dyno shop), and I was still getting 2-3 degrees of timing pulled due to knock.
Interesting enough, I filled up 6 gallons of 100, 9.5 gallons of 91. That should be well above 93 octane. Probably close to 94. I took my car to dyno about 3 hours later (had driven roughly 50 miles between pump and dyno shop), and I was still getting 2-3 degrees of timing pulled due to knock.
08-23-2005, 06:31 PM
#26
Racer
Thread Starter
Originally Posted by jimman
Could be but I used it after some conversations with the torco people and some other research on the linear response. Mine was pinging real bad after my LS2 edit getting rid of the low octane table. It pinged after 2.5 hours in LA traffic going 5 mph in 95 degree temps. Stopped at the 76 in Mission Viejo and added two gallons of their 100 octane to about a half tank, ping was gone after a few miles.
What mods have you put onto your car? What octane gas are you tuned for?
08-23-2005, 08:03 PM
#27
Le Mans Master
Originally Posted by Virt
Yuck... I was afraid of that. I was thinking about have the lower octane table removed too... But was afraid of that exact thing happening.
What mods have you put onto your car? What octane gas are you tuned for?
What mods have you put onto your car? What octane gas are you tuned for?
Halltech Stinger
GM performance Exhaust
08-23-2005, 09:30 PM
#28
Racer
Thread Starter
Originally Posted by jimman
91 octane
Halltech Stinger
GM performance Exhaust
Halltech Stinger
GM performance Exhaust
Wow
The 91 octane should keep you in the high table.... What sucks is how once you go to the lower table I heard it doesn't try the higher table until you refill with at least X amount of gallons of gas.... I wouldn't mind leaving the lower octane table on there as long as the car checked for ping more often =\
08-27-2005, 03:43 AM
#29
Originally Posted by Virt
I thought it was illegal to sell leaded gasoline at the pumps? Didn't the government pass that law a while back?
06-21-2013, 12:48 PM
#32
Melting Slicks
Wow... old thread. Here is a helpful resource:
http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal
http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal
06-24-2013, 08:03 PM
#33
I regularly buy 100 at the Unocal 76 on Pico and Barrington. It was actually $9.99 when I have purchased it there, not $10.99 as the list above says. I've also bought it at the Unocal 76 on San Vicente and Bundy in Brentwood. I wish more stations had it. I'm always trying to plan my itinerary around being near one of those places when I need petrol, especially since my car drinks gas like a wino drinks ripple. 
06-25-2013, 12:07 AM
#34
Team Owner
