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      03-20-2011, 05:03 PM   #1
nivek311
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High Octane Fuel

Can we run 100 octane fuel if it's a little leaded? Or will it ruin injectors, fuel pump, etc? I think if heard airplane fuel is the best choice for an engine with as high compression ratios as the M3.
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      03-20-2011, 05:07 PM   #2
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If you run leaded fuel you will foul your O2 sensors.

Don't do it
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      03-20-2011, 05:30 PM   #3
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Noted. Unleaded airplane fuel might do the trick then. Plus it smells delicious.
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      03-20-2011, 10:30 PM   #4
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there was a thread where someone used leaded race fuel, the pics of the of the sensors were not pretty
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      03-21-2011, 06:21 AM   #5
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If you want high octane fuel run Sunoco 260 GT, it's 100 octane, unleaded and street legal.
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      03-21-2011, 11:51 AM   #6
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airplane fuel is made for airplanes
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      03-21-2011, 12:00 PM   #7
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Quote:
Originally Posted by persian54 View Post
airplane fuel is made for airplanes
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      03-21-2011, 12:03 PM   #8
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You should use the airplane fuel. I hear you get tremendous performance gains by using it. Post pics after so we can all see if it worked
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      05-25-2011, 04:00 PM   #9
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I do not know of any unleaded airplane gasoline.

I have been a pilot for 40 years (military, and civilian) and I am unaware of any aviation gasoline that is unleaded. Many years ago the US switched to low lead 100 octane fuel for all piston engine aircraft. This fuel is great in older cars without catalytic converters or O2 sensors, but not usable in newer cars. I live in Sacramento and we have a few gas stations that sell 100 octane unleaded fuel at the pump. You could use this fuel in your M3 but I am not sure you would get any more power out of it. High octane fuel is only beneficial if the engine has a computer program that will take advantage of the higher detonation margins of 100 octane fuel. I have not heard of anyone who sells a high octane fuel "chip" for the M3.
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      05-25-2011, 04:31 PM   #10
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Quote:
Originally Posted by nivek311 View Post
Noted. Unleaded airplane fuel might do the trick then. Plus it smells delicious.
no don't do it...different fuel.
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      05-25-2011, 04:58 PM   #11
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Quote:
Originally Posted by captbilly View Post
I have been a pilot for 40 years (military, and civilian) and I am unaware of any aviation gasoline that is unleaded. Many years ago the US switched to low lead 100 octane fuel for all piston engine aircraft. This fuel is great in older cars without catalytic converters or O2 sensors, but not usable in newer cars. I live in Sacramento and we have a few gas stations that sell 100 octane unleaded fuel at the pump. You could use this fuel in your M3 but I am not sure you would get any more power out of it. High octane fuel is only beneficial if the engine has a computer program that will take advantage of the higher detonation margins of 100 octane fuel. I have not heard of anyone who sells a high octane fuel "chip" for the M3.
^This, I am pilot as well and you will not find straight 100 octane everything is 100LL
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      05-25-2011, 04:59 PM   #12
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Leaded fuel will destroy your cats....and the O2 sensors. Don't do it.
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      05-25-2011, 05:05 PM   #13
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This is the good stuff:



I know of 2 local gas stations that sell Sunoco 100 octane.
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      05-25-2011, 05:34 PM   #14
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Quote:
Originally Posted by captbilly View Post
I have been a pilot for 40 years (military, and civilian) and I am unaware of any aviation gasoline that is unleaded. Many years ago the US switched to low lead 100 octane fuel for all piston engine aircraft. This fuel is great in older cars without catalytic converters or O2 sensors, but not usable in newer cars. I live in Sacramento and we have a few gas stations that sell 100 octane unleaded fuel at the pump. You could use this fuel in your M3 but I am not sure you would get any more power out of it. High octane fuel is only beneficial if the engine has a computer program that will take advantage of the higher detonation margins of 100 octane fuel. I have not heard of anyone who sells a high octane fuel "chip" for the M3.
+10.
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      05-25-2011, 05:39 PM   #15
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Quote:
Originally Posted by persian54 View Post
airplane fuel is made for airplanes
I'm not able to follow your logic here.

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      05-25-2011, 05:39 PM   #16
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Quote:
Originally Posted by B-52Gunner View Post
If you want high octane fuel run Sunoco 260 GT, it's 100 octane, unleaded and street legal.
+1. It can be find at your local race track. It is pricey though.
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      05-25-2011, 06:09 PM   #17
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Quote:
Originally Posted by persian54 View Post
airplane fuel is made for airplanes
you don't say....
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      05-25-2011, 08:40 PM   #18
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Quote:
Originally Posted by CJR926 View Post
you don't say....
I think he was just guessing.
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      05-25-2011, 09:01 PM   #19
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Quote:
Originally Posted by radiantm3 View Post
This is the good stuff:


I know of 2 local gas stations that sell Sunoco 100 octane.
in a stock car it will make your car slower... not worth it unless you are running lots of boost or a tune for it.
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      05-25-2011, 10:11 PM   #20
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Quote:
Originally Posted by redline9001 View Post
in a stock car it will make your car slower... not worth it unless you are running lots of boost or a tune for it.
That's the opposite of what I've heard. California only gets 91 octane at 99.9% of the gas stations. Isn't that the minimum requirement for the M3? I'm pretty sure people use higher octane gas in Europe.

Here's a test done by a forum member on a stock M3: http://www.pencilgeek.org/2008/05/dy...-100-octa.html
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      05-25-2011, 10:22 PM   #21
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your stock m3 WILL run a little better on 75% 91 octane and 25% sunoco/vp unleaded fuel, 100 octane. Thats what I use on occasional basis. Someone ealier said this mix gives you about 93-95 octane fuel. On a stock engine much more than this is a waste of money.

chuck 2009 m3
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      05-25-2011, 10:28 PM   #22
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^^ Europe uses a different rating system, it is roughly the same at the end of the day.

So all that proves is that if you have stock car it will not make a difference and you spent twice the price for gas...
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