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YOUR RESEARCHOctane Blend Charts…
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Use among a host of other things, too
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How the computer handles it is decided by a number of factors - ambient temperature and air density (at temps over 68 degrees F, the computer begins to retard timing and power to handle early detonation), load on the engine, octane of the fuel being used, among a host of other things, too.
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At one time I’d seen a chart that included more starting Octane ratings from 89 up, if I find it will be replaced.[/quote]
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In Europe, you use a different measurement standard.
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Also, when I first looked at this thread I was using the PC in the lab rather then my regular desktop and it omitted the 2nd chart for some reason.
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How the computer handles it is decided by a number of factors - ambient temperature and air density (at temps over 68 degrees F, the computer begins to retard timing and power to handle early detonation), load on the engine, octane of the fuel being used, among a host of other things, too.
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These Charts may help achieving the optimum Octane of 93 (R+M)/2 for our
Cayman
’s. The first Chart is for a base of 91 (R+M)/2 followed by a second chart for a base of 92 (R+M)/2 blending with 100 (R+M)/2 Race Fuel. Remember any rating over 93 (R+M)/2 your wasting $$.
--- 91 Octane Base ---
--- 92 Octane Base---
zornet
Could just be the 2 hours I spent playing basketball in the sun but, what does this graph mean? or anyone who understands what they're looking at please explain.
For instance If you had 5 Gallons of 92 Octant (left column) and bended 1 gallon of 100 Octant you would then have a blend of 93.3 Octant. At one time I’d seen a chart that included more starting Octane ratings from 89 up, if I find it will be replaced.
zornet
Just buy 100 octane gasoline and mix it into your tank. This way you know how much of which to mix to create 93 octane in case it isn't available in your area. I'm pretty sure thats what it means.
Just out of
ignorance
& curiosity....Out here in the U.k., all the petrol stations display ' Premium, or Super Unleaded at 98 Octane'.....This appears as standard......There is no other choice of lowerunleaded petrol from what I can see......
Does that mean we regularly, unwittingly fill up on 'Racing Grade' fuel.....?
Edited by - Doc_Rishi on 06/11/2006 3:54:58 PM
At one time I’d seen a chart that included more starting Octane ratings from 89 up, if I find it will be replaced.[/quote]
zornet /fckeditor/editor/images/smiley/MWPX/wall.gif[/quote][/quote][/quote]
[/quote]
Ah, I get it now. Thanks for that clarification zornet. Also, when I first looked at this thread I was using the PC in the lab rather then my regular desktop and it omitted the 2nd chart for some reason. I think I was just having a hardtime figuring out what 92 in the first chart meant, 2nd chart would of gave it away :/fckeditor/editor/images/smiley/MWPX/lightbulb.gif
<hr style="width: 100%; height: 2px;" />quote - How do we know that 93 octane fuel would be the highest grade fuel that our
Cayman
could take advantage of?
fuser
<hr style="width: 100%; height: 2px;" />fuser,
It says so in the owner's manual, and inside the fuel filler flap - the cars are optimized for 93 octane - US octane, that is. How the computer handles it is decided by a number of factors - ambient temperature and air density (at temps over 68 degrees F, the computer begins to retard timing and power to handle early detonation), load on the engine, octane of the fuel being used, among a host of other things, too. Once you get over the 93 octane that the car is optimized for, you're just paying for higher numbers, not higher performance.
brad
Edited by - beez on 06/14/2006 09:46:05 AM
Thanks Zornet and beez,
I know there was a thread stanarded by mpollard about the price of high octane fuel sometime back, but out of curiousity what do you guys pay for your high octane fuel?
Here the only station serving this fuel charges 8.49 per gallon if you purchase 5 gallons at a time, and 7.49 per gallon if you purchase 50 gallons.
fuserchris - If your down from Santa Barbara some time this is thetrend mpollard posted --- "
http://www.planet-9.com/topic.asp?T...+Newport+Hills+NB&Forum_Title=Zone+8"]100 Octane Fuel Union 76 Newport Hills NB
.
Search capabilities of the site are quite good.
zornet
I haven't bought racing gas in quite a while - last time was end of last year for a track day at Laguna Seca with the
996 turbo
, and I paid $4.95/gal. I'm sure that bears no resemblance to current prices... it sure made the turbo fly like a bat out of hell, though.
brad
