what's the highest octane allowable for our e36's?? Also, would leaded fuel be harmful?
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Leaded? Hmm...aren't leaded fuels usually a very high octane like 120, perhaps? Unless you got FI plus other mods and racing, then I wouldn't hurt my car with leaded fuels. -
where would u get leaded fuel from?? would it be cheaper?Comment
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where would u get leaded fuel from?? would it be cheaper?
my boss buys it in 5 gals container. leaded 110 octane for about $30.. not very cheap
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Interesting how much more gas prices rise as you go over 93 octane.
Before gas got crazy in the U.S., we had a gas station w/ 100 octane racing feul for $5.99/ gallon. :eek2:Comment
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geez.. gas is expensive as is.. Are you guyz tracking ur cars or something? I don't really see another reason to be buying these outrages gas prices. 5.99 a gallon.. MAN!Comment
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Leaded fuel will destroy your cat and O2 sensor. Any more octane than what is required to keep the engine from pinging (ie preignition) is a waste of money.Comment
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In pasadena california, you can buy 104 octane race gas from the pump at a shell station. $5.99 a gallon though. You can also buy 5 gallon drums of leaded race gas from some gas stations, all you have to do is ask sometimes. Expensive though. I am not sure where, but I think I heard that our engines can't take leaded fuels..no no very bad. But you can use unleaded race gas.Comment
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yeah guys, but what is the highest octane allowable? In the Chilton manual it says 94 or higher. But how high?Comment
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In pasadena california, you can buy 104 octane race gas from the pump at a shell station. $5.99 a gallon though. You can also buy 5 gallon drums of leaded race gas from some gas stations, all you have to do is ask sometimes. Expensive though. I am not sure where, but I think I heard that our engines can't take leaded fuels..no no very bad. But you can use unleaded race gas.
Is 104 too much for our engines?Comment
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Is 104 too much for our engines?
Did you read my post? Race gas will not give you more horsepower.Comment
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Did you read my post? Race gas will not give you more horsepower.
I know that. I'm just curious on how much octane we can feed our babies(SAFELY)Comment
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I heard they sell the NOS brand gas additive for like $12 that raises the octane level above 100. My friend tried it on his turbo M3 and said he felt a nice difference. I plan to try some this weekend.
Not sure how much octane the engine can handle safely but I wouldn't go higher than 110. Jet fuel for small engines is about 100/115 and 115/145 for the larger ones.Comment
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I was unaware that there is a max.Comment
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Octane is a measure of how slowly the fuel burns, or how easy it is to ignite it. The higher the octane, the slower it burns and the harder it is to ignite.
Engines with high compression and advanced timing require higher octane fuel in order to not ping or knock. Other factors, such as air temperature and combustion chamber design, also influence the octane requirement for an engine.
Running the correct octane will let the engine run to it's fullest potential without the computer backing off the timing due to pinging. Running anything higher than that will produce less horsepower because the slower burning fuel is not releasing all of it's energy fast enough to be used. Note that higher octance fuel does not contain any more energy, it just releases it slower.
So there really isn't a maximum octane, unless you wanted to define it as the point where horsepower starts to drop off due to incomplete burning. The minimum octane would be the point where horsepower drops off due to the computer retarding the timing.
As stated before, leaded fuels will ruin the O2 sensors and the catalytic converters.Comment
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