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YOUR RESEARCHWill 100 octane do anything in a stock 996?
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Run richer or leaner
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Suggestion
The higher octane gas does not have more energy in it nor will your engine run richer or leaner.
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Suggestion
If, however, you have only 91 octane as we do in California then you will benefit with a mix of high octane unleaded (unless cost is no object then use all 100 unleaded)to increase your octane to 93.
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Suggestion
This system also uses a knock sensor to determine the maximum amount of timing advance that can be tolerated without knock.
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If, however, you have only 91 octane as we do in California then you will benefit with a mix of high octane unleaded (unless cost is no object then use all 100 unleaded)to increase your octane to 93.
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No but your car needs more than 91 (93 to be exact) for it's maximum potential. During hot summer days, you may benefit from a 91/100 mix.
Here's some info on this:
<a href="http://www.rennsportsystems.com/~porsche/2a.html" target="_blank">Gasoline, Detonation, Timing, and Twin-Ignition</a>
Not really, but the exhaust will smell really really good!
Make sure it's unleaded (believe it or not, some of that high octane racing gas is leaded still...well at least here in the backwoods) or you'll do some serious converter damage.
Mike
'02 C4S
The octane of fuel describes it's resistance to knocking when tested in a specialized engine for this purpose. The higher octane gas does not have more energy in it nor will your engine run richer or leaner. Your cars electronic engine management system determines, by measuring a number of variables, the appropriate injection of fuel to achive the correct air fuel ratio (richness/leaness) for complete combustion.
This system also uses a knock sensor to determine the maximum amount of timing advance that can be tolerated without knock. It does this by increasing the timing up to a preset limit until knock is detected by the piezo sensors attached to the cylinders. They literally "listen" for knock. When knock occurs timing is dialed back until knocking stops. Generally, higher octane fuel tolerates more timing advance before knock occurs and somewhat greater cylinder pressure, and therefore power, are generated.
So, if your car is set to make maximum power with 93 octane as stated in the post by Viken above, and you can get fuel of this quality then go no further. If, however, you have only 91 octane as we do in California then you will benefit with a mix of high octane unleaded (unless cost is no object then use all 100 unleaded)to increase your octane to 93. My car with a 93 octane Euro RS chip runs awful on 91 octane, I can hear it ping and the engine soften as the timing is dialed back by engine management under full throttle. With a mix of 91 & 100 unleaded all is well. <img src="graemlins/yltype.gif" border="0" alt="[typing]" /> <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
I can't believe you guys in CA can't get 93 octane! Did the condors and spotted owls have anything to do with this? I love nature and the Discover Channel but this is ridiculous.
Jim:
You are so correct, and don't forget the Redwood trees. I can still get 104 Octane at a local gas station but I am keeping really quiet about it, or else the envirocrazies will be sitting in front of my house.
Bocky <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
Another CA resident here, but I don't have any stations around that sell anything above 91. Any recommendations on octane boosters. I've heard that 104+ is the way to go, but I would be interested if anyone has suggestions (unfortunately, moving to another state is not an option).
I have read that the so called "octane boosters" are almost useless, at least in volumes added. Anything that would be truely effective in the volumes they are selling would be too toxic to market. I found a local supplier of Union 76 unleaded racing gas, but he won't put in into car, only portable cans. I store a couple of 5.5 gallon Jaz cans of it and add to fuel as neccesary, mixing with Union 76 91. I add around 25% 100 octane or about 1 Jaz can per fill up. Works for me, but I don't drive car a lot, and not on trips.
Yes, California is a great place to live, particularly San Diego, where the octane may be low but a least the prices are the highest in the nation.
[quote]Originally posted by Ocean Blue Cabrio:
<strong>Another CA resident here, but I don't have any stations around that sell anything above 91. Any recommendations on octane boosters. I've heard that 104+ is the way to go, but I would be interested if anyone has suggestions (unfortunately, moving to another state is not an option).</strong><hr></blockquote>
Read the link I posted above regarding octane boosters or other additives.
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