Bob Rouleau

The manual and the gas cap in my GT3 both specify 93 octane using the average method of RON+MON/2; that being said, Shell is 91. I use Sunoco in Ontario and Petrocan 94 in Quebec.

Jaak Lepson

Providing it is programable for Ethanol ... if not .....

Bob Rouleau

The Porsche manual says up to 10 percent is OK. Someone told me that Sunoco and Petrocan 94 is 14 percent. Can anyone confirm that?

MichelleJD

It is modded, but I'm getting a stand-alone EMS and may be able to deal with detonation issues. I just dislike Shell and was hoping for an alternative. Maybe Sunoco is the way to go......

Jaak Lepson

To clear up a bit of confusion in North America we use a CLC measurement. CLC is 4 points LESS than RON which is used in the rest of the world so 95 RON is equal to 91 CLC. If your car needs 93 RON ... it will be more than covered with Shell 91. See this link http://www.type2.com/bartnik/octane.htm

Here's another link: http://en.wikipedia.org/wiki/Octane_rating

In most countries (including all of Europe and Australia) the "headline" octane rating, shown on the pump, is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, is 91–92 in Europe. However most European pumps deliver 95 (RON) as "unleaded", equivalent to 90–91 US (R+M)/2, and some even deliver 98 (RON), 100 (RON), or 102 (RON).[2]



Sunoco 94 has close to 10% Ethanol. Look at the sticker on the pump.

Jaak Lepson

Ethanol causes cats to go prematurly ...

We are allowed a max of 10% at the pump unless it's set as e85.

Bob Rouleau

Jaak, do you have any references for the ethanol/failed cats comment. I am mightly suspicious about cat failures in cars running 94 octane pump gas.

Jaak Lepson

Talk to Jumper 5838 ... he's had issues! 94 uses Ethanol ... also talk to Gretch where frinds of his had snow sleds engines go due to ethanol.

Jaak Lepson

More on the cat issue:


In a USA Today article, USA Today blew the whistle on the move to e20 in Australia. Reportedly, e20 testing in Australia lead to the damage of 40 percent of all the car's catalytic converters. http://www.e85safety.com/

Automakers also have doubts that it is as benign as E10. They are running trials, but they say they do not have enough data on how risky E20 is to components and whether it would change emissions in unwanted ways.

"Our vehicles are able to handle E10, but to move to E20 there are technical issues. It's not that simple," says Ford Motor (F) spokeswoman Kristen Kinley.

General Motors (GM) spokesman Alan Adler says that in E20 tests in Australia, "40% of the vehicles sustained (catalytic converter) damage, which allowed essentially unchecked tailpipe emissions."

"We believe there's not data sufficient to prove that all vehicles will function OK with E20," says Reg Modlin, director of environmental affairs for Chrysler. "It's not a legal fuel, and it would void the warranty."

http://www.usatoday.com/money/autos/...nol-fuel_N.htm


Washington, D.C. – A new government study of ethanol fuels found that they don’t increase tailpipe emissions, but that mileage does go down when gas contains as much as 15 percent or 20 percent alcohol. Ten percent ethanol is now the legal limit for use in most cars.

The study, released today, also found that ethanol can increase temperatures in some cars’ catalytic converters, and that excess heat could be sufficient to damage the converters, according to an auto industry group.

The Energy Department studied the impact of the ethanol blends, known as E15 and E20, on 13 different automobile models and on 28 types of small engines, including ones used in lawnmowers and generators.

Under federal regulations, gasoline cannot contain more than 10 percent ethanol except for use specially equipped, flexible-fuel cars.

The ethanol industry wants the government to allow blends such as E15 or E20 to expand the market for the fuel. However, car makers and manufacturers of small engines have raised concerns that the ethanol could harm engines, and the higher blends also could run afoul of federal air-pollution laws if the alcohol were to increase emissions or damage emission-control equipment.
http://www.desmoinesregister.com/art...20/-1/biofuels

http://www.biofuelsdigest.com/blog2/...ses-emissions/

Turbodan

I was told by an Imperial Oil executive who I know that turbocharged engines will benefit performance wise with sunoco 94. I really don't care about my cats on the 951 it is an 87 no more e-tests.

theiceman

you may have to switch as there is no BP in Canada .. it would be a long drive back to get gas

Jaak Lepson

My 951 likes Shell better ...GURU V8.0 chip ...

MichelleJD

GURU?! THAT'S a blast from the past!

Jaak Lepson

Yup ... and she runs real good .... They replaced the Weltmeisters I had ... much better.

Turbodan

Jaak you should read about Russel's max 951 chip. He knows guru and has altered gurus codes and in his words "cleaned it up a lot". His chips are pretty much the only ones recommended on the 951 board and a lot of testing has been done.