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That website is great, but sometimes the fuels listed are not available at their pumps (only if you buy a 55 gallon drum or some other quantity), like Hill Petroleum in Arvada, CO (the Denver area).
Yup.
I believe that SS-100 is the Sunoco unleaded gasoline that is street-legal in California, following CARB regulations.
It appears to have 9.5% ethanol by volume per the specs.
It's known as 260 GT outside of California.
Yup.
I believe that SS-100 is the Sunoco unleaded gasoline that is street-legal in California, following CARB regulations.
It appears to have 9.5% ethanol by volume per the specs.
It's known as 260 GT outside of California.
Unfortunately has 9.5% Ethanol (as you said), but this will raise your octane by adding some to pump 91. I think the Sunoco 98 (260GTX) comes in Ethanol-Free:
I go out of my way to avoid Ethanol in my GT3 (but we have nothing more than 91 octane in Colorado, without resorting to 100 octane race fuel that does include Ethanol).
If you can still get 94 Ethanol free, I'd use that in a heartbeat. Unless your car has an aftermarket tune, it will run best with 93 Octane Ethanol-free or slightly higher. Lower octane and any ethanol content will theoretically cause a bit of power loss.
Ethanol yields less energy than gasoline per gallon and can harm some parts in the fuel system and attract water (but nothing to get too alarmed about under E15).
If you had a specific tune for it, you could probably make more power with 100 octane race fuel with ethanol (Sunoco has around 10%, AFAIK).
Thanks so much @GrantG this is the answer I was looking for. My car is fully stock with no tune, so I’ll stick with ethanol free as long as it’s available from Top Tier fuel providers.
Slow day at work so I’ve been researching fuel for the 992 GT3/RS, and thought I’d make a thread because there are a lot of highly knowledgeable people here regarding motors and engineering who can hopefully shed some light on my current dilemma.
Is it better for the motor’s longevity, durability, and preventing it from going “boom” during a HPDE or spirited mountain drive by using ethanol free gasoline, or fuel with ethanol that performs better?
Here’s a recent video testing the new 2022 Shell V-Power 91 & 93 formulations (which now contain 5% & 7.5% ethanol respectively) vs. the previous top performing fuel Chevron 94 ethanol free. All fuels from BC, Canada and it’s very sad to see the Shell V-Power is no longer ethanol free which was always my go to fuel. Also shocking the top fuel adds 30hp & 19lbft of torque more than the lowest. I never thought such similar gasolines would have this large of a delta.
Edit: Link didn’t work, see below comment for working link.
Additionally, here’s a picture of the 992 GT3 owners manual which states the motor can tolerate up to 15% ethanol.
So which fuel should we use? Listed Best to Worst from the YouTube test:
1: Chevron 94 + 10% Ethanol Manual Mix
2: Shell 93 (7.5% Ethanol)
3: Shell 91 (5% Ethanol)
4: Chevron 94 (Ethanol Free)
Appreciate any input, thanks.
So anyone of the myriad of California GT3 owners here concerned about full throttle in your GT3 on the crappy 91 Octane fuel we are offered ?? Asking for a friend....
So anyone of the myriad of California GT3 owners here concerned about full throttle in your GT3 on the crappy 91 Octane fuel we are offered ?? Asking for a friend....
That’s totally safe, but the ECU may restard timing a touch to reduce chance of knocking (and power)
sorry I'm not familiarized with the term. In Poland they just call it racing 100. There are 95, 98 also
Research Octane Number (RON) and Motor Octane Number (MON) are two different tests to determine 'knock" point. In USA gasoline is labeled as the average of the two (R+M)/2. I believe in most of Europe gas is labeled with just the RON, but not certain as I haven't been there for a very long time.
I found out in internet:
"99 RON Shell V-Power racing features enhanced octane quality. With an octane rating of 99 RON, Shell V-Power is designed to provide more power and improved responsiveness in many modern cars"
01-06-2023, 03:10 PM
