94 Octane Gas - Where?

[Orbie]

So anyone specifically tuned on Husky 94, what are you running or going to be running? I have tried on Shell 91 and it runs poorly on it, wondering if the PetroCan 94 comparable to Husky since it has ethanol, or retune?

[arcticcat522]

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I don’t know if it’s because of heat issues, but I knock on Shell 91 and have zero knock on Husky 94.

Same with me on my 135i. It wasn't crazy amount of knock, but still there. I'll need to get the tune updated for Shell 91 it looks like. FML

[SpdDmn268]

My tuner has tested and doesn't recommend Petro94.. Their results for Chevron weren't consistent, so I guess I'll stick with Shell91.
Already flashed the 91oct OTS map on my winter beater :'( And just go E85 for the summer car?

[Mitsu3000gt]

The theory I have read is that (generally speaking on 'stock' vehicles) higher octane with a bit of Ethanol (eg. Husky 94) is usually better than lower octane with no ethanol (eg. Shell 91) because the reduced knock from the higher octane value allows for more performance than you are losing due to the less efficient combustion from the ethanol. Is that true or is that just a common misconception?

[ThePenIsMightier]

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The theory I have read is that (generally speaking on 'stock' vehicles) higher octane with a bit of Ethanol (eg. Husky 94) is usually better than lower octane with no ethanol (eg. Shell 91) because the reduced knock from the higher octane value allows for more performance than you are losing due to the less efficient combustion from the ethanol. Is that true or is that just a common misconception?

If you read below, it seems like a few people are reporting Shell 91 gave them less knocking than any alleged 94, ethanol, or not.

*I'd just like to add that while V-Power is ethanol free in this market, that's not a guarantee elsewhere. The Scotford refinery doesn't supply fuel to all stations in all of Western Canada.

[killramos]

You would be pretty hard pressed to find a stock vehicle that would actually knock on Shell 91 at Calgary’s altitude.

[rage2]

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The theory I have read is that (generally speaking on 'stock' vehicles) higher octane with a bit of Ethanol (eg. Husky 94) is usually better than lower octane with no ethanol (eg. Shell 91) because the reduced knock from the higher octane value allows for more performance than you are losing due to the less efficient combustion from the ethanol. Is that true or is that just a common misconception?

Generally, yes. There are other variables too. Ethanol is something like 40% less energy content than straight gasoline, so there's a bit of a power loss there, so 4% in a E10 10% ethanol fuel. Then there's the tuning, the stoichiometric ratio for ethanol is very different than gasoline, 14.7:1 for gas and 9:1 for ethanol IIRC so your stoich shifts richer as you have more ethanol, so you need to tune for that to get optimal power. The reason why ethanol blended fuels are better for FI applications is cooling, so in effect it's almost higher knock resistance thx to cooling the mixture than the 94 rating suggests. That's what made Husky 94 so damn good for FI applications if you're tuning specifically for it. Bad for fuel economy but awesome for outright power. It's a terrible fuel for NA cars (at our elevation), or stock tuned cars.

Shell 91 is good in a different way because I genuinely felt that it's higher than it's rating compared to other 91's I've tested back then. I could run higher boost, more aggressive timing than anything else. It's been over a decade since I've been in the game, so things might've changed since then.

[Mitsu3000gt]

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Generally, yes. There are other variables too. Ethanol is something like 40% less energy content than straight gasoline, so there's a bit of a power loss there, so 4% in a E10 10% ethanol fuel. Then there's the tuning, the stoichiometric ratio for ethanol is very different than gasoline, 14.7:1 for gas and 9:1 for ethanol IIRC so your stoich shifts richer as you have more ethanol, so you need to tune for that to get optimal power. The reason why ethanol blended fuels are better for FI applications is cooling, so in effect it's almost higher knock resistance thx to cooling the mixture than the 94 rating suggests. That's what made Husky 94 so damn good for FI applications if you're tuning specifically for it. Bad for fuel economy but awesome for outright power. It's a terrible fuel for NA cars (at our elevation), or stock tuned cars.

Shell 91 is good in a different way because I genuinely felt that it's higher than it's rating compared to other 91's I've tested back then. I could run higher boost, more aggressive timing than anything else. It's been over a decade since I've been in the game, so things might've changed since then.

Thanks, that makes sense. Sounds like 94 is still the way to go for FI cars unless you have the benefit of testing multiple tunes.

[Orbie]

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My tuner has tested and doesn't recommend Petro94.. Their results for Chevron weren't consistent, so I guess I'll stick with Shell91.
Already flashed the 91oct OTS map on my winter beater :'( And just go E85 for the summer car?

Did your tuner specifically say why they did not recommend Petro94?

[Xamim]

Is Husky 94 completely gone? My summer car is tuned for it so I haven't been to a Husky since last year. I know that some stations stopped carrying it but other stations still had it, or at least did when I filled up at those locations last fall (Deer Ridge and Macleod & 42nd Ave).

[SpdDmn268]

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Did your tuner specifically say why they did not recommend Petro94?

Lots of knock (not my car/tune specifically, across all his tunes and testing)
Weird that Petro94 in Ontario is the go-to.

Xamim
Is Husky 94 completely gone? My summer car is tuned for it so I haven't been to a Husky since last year. I know that some stations stopped carrying it but other stations still had it, or at least did when I filled up at those locations last fall (Deer Ridge and Macleod & 42nd Ave).

Deer Ridge had switched when I was there Saturday

[Xamim]

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Lots of knock (not my car/tune specifically, across all his tunes and testing)
Weird that Petro94 in Ontario is the go-to.



Deer Ridge had switched when I was there Saturday

Well then... Guess I'll have to get in touch with Sunny and see what he recommends now.

[ExtraSlow]

Thread weirdness test.

[rage2]

Fixed it.

[bspot]

Has anyone logged Mohawk 91 yet?

[GTS Jeff]

I've switched to Shell 91 and set the octane on my EPL adjustable tune down to 91. 3.24 pulley ratio. Car still runs well but I haven't logged yet. One thing I did notice is a massive gain in fuel economy - I averaged 7.4L/100km highway driving this weekend.

[Xamim]

Husky decided to realign our fuel grade slate with the rest of the market and what is available from the refineries that supply our fuel. We apologize for the inconvenience but unfortunately, octane 94 will no longer be available at Husky stations.

Got this as a reply from Husky customer service.

[ThePenIsMightier]

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Got this as a reply from Husky customer service.

Thanks for digging that up.
I can't wait to see my friend lose her mind this summer trying to fill her Huracan! RoFL!!
You know how even smart people do stupid things? This is one of those things. Crazy smart. Chemical engineer with career in hydrocarbons processing. Has forgotten more about combustion than most will ever learn.
Vehemently insists on Husky-94 for Lambo...

Oh gawd, I'm doing the pee-pee dance thinking about how to tell her!!
I am so excite!!

[faiz999]

~~

[killramos]

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Thanks for digging that up.
I can't wait to see my friend lose her mind this summer trying to fill her Huracan! RoFL!!
You know how even smart people do stupid things? This is one of those things. Crazy smart. Chemical engineer with career in hydrocarbons processing. Has forgotten more about combustion than most will ever learn.
Vehemently insists on Husky-94 for Lambo...

Oh gawd, I'm doing the pee-pee dance thinking about how to tell her!!
I am so excite!!

You can buy her a barrel of ethanol for Christmas.