Johnny DB

That's what I'm using because it was the fuel that pulled the least amount of timing. I was using Vpower 91 because it was ethanol free but the timing pull was bad....

Johnny DB

Did not know that, thanks!

cstyles

Ya it's pretty eye opening when you look at what the ECU is doing via data logs! There is something different about our fuel in Canada compared to the USA fuels - even though our 'top' fuel is 94 octane, it has less knock resistance than USA top tier 91 octane (except the states with really poor fuel as a result of regulation ie Arizona, California and Nevada).

Cobb Tuning warns on their website that if you're using Canadian 94 octane you need to run their least-aggressive ACN91 map, which they have purposefully dialed everything back due to the poor fuel quality in those three states. I couldn't believe our Ultra 94 had to be matched with the hobbled mapping from Cobb. So of course I did some logging using Ultra 94 and Cobb's 93 octane map. ECU was pulling 10 degrees of timing across all cylinders, it was clearly not liking the situation. So then I changed the mapping to Cobb's 91 octane map and again data logged. Still lots of knock sensor activity! Sure enough and as promised by Cobb, I switched to the ****ty ACN91 map and that's the only map that had knock patterns similar to stock tuning. I couldn't believe it but it's true - and no one can empirically explain why our 94 octane fuel has significantly less knock resistance than USA's 91 octane.

As a result of my testing, I sold the Cobb Accessport and decided to do a customized tune with Kevin @ UMW instead - specifically for my car, using Ultra 94 fuel. Not cheap and unable to be resold at a later date, but I like the peace of mind that the car is tuned professionally & safely for the exact fuel I'm using.

Would love if someone out there 'in the know' could actually explain the knock resistance difference between Canadian and USA gasoline. The same question has been asked across every tuner platform out there including GTR's, Subaru, JDM, etc... No firm answers.

993GT

^+1 for custom tuning, EPL 'track' tuned on 91oct, is a freight-train no matter the conditions

911 Rod

Please explain Rob.

993GT

Anything in particular? custom tuning vs OTS (off the shelf) allows you to dial in the car via datalogs and/or dyno... a track tune is slightly more conservative(boost/timing, boost 'hit') vs the industry norm street tuning to account for higher operating temps(IAT's in particular) experienced while tracking, also custom tuning allows you to dial-in how the throttle/boost mapping is done
also get 2-step, change OBC readout for bigger injectors,etc

I am the Walrus

Johnny DB

Where are you located? Vancouver?

I am the Walrus

hi
yes, Vancouver
(There is a no ethanol sticker for 94)

ronnie993tt

All those anti-pipeline enviro ***** and yet you still have the best gas for high performance vehicles! Chevron also had Techron in it as I recall. Very jealous.

.2PDK

Wait till Notley restricts the flow and prices jump...

jumper5836

is EPL the same as the tune cstyles mentions "customized tune with Kevin @ UMW"

I have the 996tt GIAC tune. Not sure about changing it, I run Shell 91 and have run ultra 94. Doesn't seem to matter which one I use I see no difference on top speed on the back straight at Mosport. From what I can tell it run greats with the giac tune.

mistermct

This. Also a fully separate pump so no mix from other grades. Only fuel I use in my cars... except the diesel

Brian 162

Costco gas is 91 octane and ethanol free. Just get there at 7 in the morning when there's no line.

Mark Henry

In Ontario except for ESSO and petro canada all gas is the same, it all comes from the same refinery. ESSO and petro canada come from a different refinery in Montreal.
The big thing for me is I want super from a station that sees high turnover on the premo. No such thing as mid-grade from the refinery, it's mixed reg and super at the pump that's why it's 5% methanol.
Turbo's would actually benefit from methanol, besides boosting octane it has a cooling effect in the burn.
Modern cars don't really have a problem with methanol, as long as it doesn't sit in the tank long. Over winter storage use pure gas and stabilizer.

Easy gas/methanol test is take a glass jar (small, tall and skinny is best) and fill it with some gas, add 10% water to it, give it a shake and let it stand for a few minutes.
If the water on the bottom looks like it doubled in volume that's 10% methanol. No change in the 10% water level no methanol.
I've tested super at costco, shell, ultramar, etc., the premo is pure.