986 Forum - for Porsche Boxster & Cayman Owners

986 Forum - for Porsche Boxster & Cayman Owners (http://986forum.com/forums/)
-   Boxster General Discussions (http://986forum.com/forums/boxster-general-discussions/)
-   -   Octane?? (http://986forum.com/forums/boxster-general-discussions/43863-octane.html)

Timco 03-28-2013 05:24 PM

Octane??
 
Car says use 93 min. Here I can only get 91 octane.

Can someone tell me what this translates into as far as performance or engine life?

KRAM36 03-28-2013 05:52 PM

I don't know the answer to your question, but I have the same issue here. I buy some Octane Booster for every fill up.

thstone 03-28-2013 06:22 PM

Higher octane allows the ECU to advance the timing to get slightly more power. Very slightly. The ECU will automatically adjust the timing to account for 91 octane. No worries.

1olddude 03-28-2013 07:05 PM

91 is the same octane in Utah as 93 in California because of the elevation. You won't see any difference.

Kenny Boxster 03-28-2013 08:31 PM

Quote:

Originally Posted by KRAM36 (Post 333961)
I don't know the answer to your question, but I have the same issue here. I buy some Octane Booster for every fill up.

91 is the highest some states have, which is not a problem for the Boxster. Get 93 if you can, but don't waste any money on Octane Booster. Snake oil at it's best. Some have been even been found to reduce power, and some contain ethanol. No good.

blue2000s 03-28-2013 08:54 PM

Because the air is less dense in the mountain states, the engine is less sensitive to knock, hence the lower octane requirement. 91 in the mountains is equivalent from an anti-knock standpoint to 93 at sea level. You WILL NOT make as much power as a car at sea level, but it's due to the density of air, not the octane of the fuel. Adding octane booster is a waste of money, and actually will drop power even further. In other words, what Kenny said.

Timco 03-28-2013 09:24 PM

Quote:

Originally Posted by blue2000s (Post 333989)
Because the air is less dense in the mountain states, the engine is less sensitive to knock, hence the lower octane requirement. 91 in the mountains is equivalent from an anti-knock standpoint to 93 at sea level. You WILL NOT make as much power as a car at sea level, but it's due to the density of air, not the octane of the fuel. Adding octane booster is a waste of money, and actually will drop power even further. In other words, what Kenny said.

So can I carry an oxygen tank with me and run a hose to the intake? Like nitrous?

Jaak 03-28-2013 09:52 PM

From the Canada Forum on Rennlist that I had posted:


Did the search:

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 Octane Ratings

Here's another link: Octane rating - Wikipedia, the free encyclopedia

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 9192 in Europe. However most European pumps deliver 95 (RON) as "unleaded", equivalent to 9091 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.

986_c6 03-28-2013 09:58 PM

Been running 91 octane (which is the best we can get in the sorry state of Cali) on all my cars with no probs.

tricolour 03-28-2013 10:02 PM

As JAAK has said.

In Oz we have 91, 95 and 98 RON.
The fuel sticker on my wifes 'S' says 96 RON.
I run it on 98 mainly because of the high summer temperatures that can stay in the 35C - 38C range for weeks.

blue2000s 03-29-2013 05:54 AM

Quote:

Originally Posted by Timco (Post 333991)
So can I carry an oxygen tank with me and run a hose to the intake? Like nitrous?

It's exactly what Nitrous Oxide injection does.

ProjectM96 03-29-2013 06:06 AM

Quote:

Originally Posted by Timco (Post 333954)
Car says use 93 min. Here I can only get 91 octane.

Can someone tell me what this translates into as far as performance or engine life?

When I bought my Boxster, most gas stations in my area had 91 and 92 octane.

I called up Porsche of America and they said I can use a minimum of 91 octane. I lose about 0.2HP for using it over 93 octane, but who cares?

It makes no difference in reliability or gas mileage. Those are just myths.

986Porsche986 03-29-2013 06:46 AM

I've been using 91 for the last ten years in her with no problems. I did recently find a cheveron station that does sell the premium with no ethanol, so I've been using that every chance that I get.

986_c6 03-30-2013 12:29 AM

Yes. I agree with 986Porsche986.

I would worry about the performance loss with ethanol content in the gas more so than the actual octane.


All times are GMT -8. The time now is 01:13 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website