100 Octane - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 08-15-2005, 03:37 PM
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Alright. ive been reading around on forums that most people put 87 octane in thier bimmers. ever since ive had one ive been putting in 91 octane because I want to treat her well and thats what the last owner put in her. ive read about people putting in 93 octane but what about 100 octane? doe you need mods to do it or could i try it once.. (once its expensive)?
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#2 (permalink) Old 08-15-2005, 06:53 PM
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Quote:
Originally posted by htp.bmw@Aug 15 2005, 12:37 PM
Alright. ive been reading around on forums that most people put 87 octane in thier bimmers. ever since ive had one ive been putting in 91 octane because I want to treat her well and thats what the last owner put in her. ive read about people putting in 93 octane but what about 100 octane? doe you need mods to do it or could i try it once.. (once its expensive)?
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flogging a dead horse.

91 octane has no more cleaner agents in it by government standards then 87 octane does.

91 does NOTHING to improve performance unless it has more cleaning agents, the octane itself doesnt do anything if the motor isnt programmed to use it. with a performance chip which advances your timing when it uses higher octane fuel, yes you will see better performance, but if the ECU/DME/PCM is programmed to use
87 octane, nothing will change (for the better, at least) by using 91 octane fuel.
higher octane burns slower, not faster, which again, does nothing to help performance.

i'm not even going to get into this arguement yet AGAIN. ghead

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#3 (permalink) Old 08-16-2005, 12:59 AM
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I didnt mean to start one but thank you

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#4 (permalink) Old 08-16-2005, 01:14 AM
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I think 100 octane is the fuel made up of a gasoline and ethanol mixture. Some car have the ability to burn it, but most do not. It costs a bit less than the other grades but it isnt really worth it because I think you get worse gas mileage. I read it somewhere...but where?

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#5 (permalink) Old 08-16-2005, 03:43 PM
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The actual scientific answer to your question is this:
Octane ratings in gasoline are directly related to the amount of octane vs. the amount of heptane contained within a given fuel grade. in the case of "87 octane" pump gasoline, you're using 87% octane and 13% heptane. The heptane in your gasoline will spontaneously combust under very little compression, where as the octane is the opposite taking much more compression to ignite on it's own. Soo, what nukeduster said was pretty well directly on the mark. If your car was designed with 87 octane pump gas in mind, then about the only thing your going to accomplish by using a higher grade of fuel is spend a bunch more money. Two things demand a higher octane fuel : retarded timing and/or an engine with a modified compression ratio(I.E. HIGHER compression ratio). Octane doesn't make it burn hotter, faster, or slower. It just takes more compression before going off on it's own and causing that nasty noise in your engine bay.
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#6 (permalink) Old 08-16-2005, 06:08 PM
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Here we have Unleaded 95,98,100 and I have seen major difference in acceleration and power when I started using 100 octane gas instead of 95. ECU has remained as it was from 1989 when I first bought the car (I had been using Leaded premium 98 octane until 2002)

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#7 (permalink) Old 08-16-2005, 11:04 PM
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A lot of people say that their cars run better with 9x octane gas when the car is designed to run on 87. The only way that your car could actually have increased performance with a higher octane than it was designed for is if the carbon buildup inside your cylinders is actually thick enough to change the compression ratios. A couple of people on here explained it already so I'm not going to continue to beat the topic to death, just try reading on howstuffworks.com about octane ratings.

And where in the world are you people getting 100 octane fuel? And 98 octane leaded? Isn't that illegal except for on racetracks? Leaded is terribly polluting.

Oh and htp.bmw, you still parting out that bimmer or what?

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#8 (permalink) Old 08-16-2005, 11:40 PM
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yea I am taking it apart, sorry for the delay but im taking time off of work to do it and ill take your offer, but your gonna need to buy break pads for it.

next week im taking the car apart

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#9 (permalink) Old 08-17-2005, 05:58 AM
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Quote:
Originally posted by filter27e@Aug 16 2005, 10:04 PM
A lot of people say that their cars run better with 9x octane gas when the car is designed to run on 87. The only way that your car could actually have increased performance with a higher octane than it was designed for is if the carbon buildup inside your cylinders is actually thick enough to change the compression ratios. A couple of people on here explained it already so I'm not going to continue to beat the topic to death, just try reading on howstuffworks.com about octane ratings.

And where in the world are you people getting 100 octane fuel? And 98 octane leaded? Isn't that illegal except for on racetracks? Leaded is terribly polluting.

Oh and htp.bmw, you still parting out that bimmer or what?
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98 Leaded has been discontinued due to European Union regulations from 2002. We do have Unleaded 95, 98 and 100 Octane here (Cyprus & Greece). I also heard that in Japan they have 105 and 110 Octane fuel

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#10 (permalink) Old 08-17-2005, 03:12 PM
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i know they still have leaded fuels in south america and other places. . .

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