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Old 02-14-2004, 04:36 PM   #16
Sylak
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Fo my 325E i use premium fuel 91 octane. I got a Jim c chip.
For my 325I i use regular. the engine is complety stock and run like a new despite his 260 000km! last summer i try 91octane juste to see if the engine run better and it change nothing at all. so for my I regular is ok ( and she's a best performer tah me E and use cheaper fuel lol)
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Old 02-14-2004, 04:41 PM   #17
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I run 93 octane, its $1.99 a gallon down here. I have a chip, and in the hot Florida weather, my car will ping without 93 oct.
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Old 02-15-2004, 01:46 PM   #18
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Originally posted by Digitalwave
I run 93 octane, its $1.99 a gallon down here. I have a chip, and in the hot Florida weather, my car will ping without 93 oct.
This is a must see for you then. Here is a 3-month comparison chart of gas prices in Toronto vs. Miami, in your units:
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Old 02-15-2004, 03:24 PM   #19
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Originally posted by Mystikal
This is a must see for you then. Here is a 3-month comparison chart of gas prices in Toronto vs. Miami, in your units:

I wonder if there is any need for the insane jumping around of the gas prices in toronot?

I use 91 octane.. chip or no chip, I think it better to stick with one octane rating and one brand then to switch around every time you fill up.
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Old 02-15-2004, 05:14 PM   #20
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Yeah, to add to what Slowered pointed out and to the thread in general, I always use Shell 91 in my car. I have a chip, and from the day I put it in I was running Sunoco 94. About a month back I was passing the Shell station near my house and it was CHEAP. So, I filled up. I never put a thought to it, but the first time I merged onto the highway I felt a difference. I went back to Sunoco for 1 tankful, and sure enough it slowed the car down.

The fact is, use the minimum rating your car is set up for.
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Old 02-17-2004, 02:57 AM   #21
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you should always fill up at the same station!
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Old 02-17-2004, 09:17 AM   #22
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Originally posted by SebSter
i have a chip so i put 94 whenever i can, 91 if i run out and cant find a sunoco around

though, even before getting the chip i experimented a bit and found i got more mileage with higher octane fuel..then again maybe it was just my imagination
Have u tried shell 91??? I find it works better then the 94
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Old 02-17-2004, 10:44 AM   #23
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I use 93 octane on my car, I heard it helps keep everything running better cleans all the pipes and will give me better gas mileage
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Old 02-17-2004, 01:14 PM   #24
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93/94
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Old 02-17-2004, 03:56 PM   #25
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Originally posted by bimmerdude
I use 93 octane on my car, I heard it helps keep everything running better cleans all the pipes and will give me better gas mileage
Please tell me how higher octane fuel is going to "clean your pipes"?

The fact of the matter is, unless your car is setup for high octane (with a chip), then you aren't going to gain anything by using higher octane. Not even better gas mileage. More realistically you would lower your gas mileage since the higher the octane, the harder it is for your car to ignite.
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Old 02-17-2004, 05:52 PM   #26
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ive tried that sunoco or is it shell?that 94 octane ,no impovement in performance,but a hell of a lot more stink to it(it would've burt your eyes if you were following me)
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Old 02-17-2004, 10:04 PM   #27
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I cant believe americans have not upgraded their refinreies to be able to porduce 98 octane!

I'm in Australia and I think its pathetic we deont have ours upgraded to have an octane rating of over 100 jsut like that japenese!
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Old 02-17-2004, 10:33 PM   #28
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all cars can accept 15% ethanol, but you wouldnt want to run that all the time. it will "dry out" the rubber in the pump and injectors, etc. the octane, i might be wrong, does nothing execpt prevent detonation. that is why cars that run high compression from the factory (suburbans even say to run at least the plus gas) say to use premium fuel. my land cruiser has 11.5/1 compression and i have to run 92 plus an octane booster just to get it to stop pinping (that is in texas where is gets up to 115F). i put it in the bimmer only because it has the non us pistons that have 9.2/1 compression. it can run on plus fuel but not the reg., it pings to much. basically diesel's use compression to "fire" and petrol cars use a spark. the higher to compression the easier it is to combust when there is heat (that is why if your engine has a lot of carbon you can "Diesel" the motor when turning it off or the motor pings after it heats up, or in turbo cars the metal edges have to be filled down to prevent preignition. all this causes hot spots). most of the time all cars can run on 87. it is a complete waste of money to say "its an old car so i have to run premium fuel in it." unless its a muscle car, some of those had 16/1 compression. chips are running higher octane because they advance the motor to get power and it will ping if they dont. you wont notice anything and if you do it is all pschological. i can take my motorcycle and put race fuel in it and notice the difference because it has 12.5/1 compression, i can put race fuel in my land cruiser and not really notice the difference. WHY? because even though race fuel has higher octane it is designed to burn a certain way and has to fulfill many different compression ratios, but even then you notice what, 5hp max difference, i hate to break it to ya'll, you wont feel that unless you and the car way as much as a motorcycle. so if you only gain 5-10hp with race fuel, and trust me you do that for racing every .001 sec counts, but on the street you say that you feel the difference, how come people pay 5-7 dollars/gal for race fuel when they could buy premium fuel and feel the difference? there is no way unless you were chipped, but this is to the "stock" cars.
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Old 02-17-2004, 10:41 PM   #29
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Quote:
Originally posted by Digitalwave
Please tell me how higher octane fuel is going to "clean your pipes"?

The fact of the matter is, unless your car is setup for high octane (with a chip), then you aren't going to gain anything by using higher octane. Not even better gas mileage. More realistically you would lower your gas mileage since the higher the octane, the harder it is for your car to ignite.
sorry dude thats just what i heard
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Old 02-17-2004, 10:57 PM   #30
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Actually Bimmerman, you aren't 100% wrong, Sunoco 94 has detergents in it that are very powerful in removing build up in the injectors. Three tanks of 94 in the e30 and the start ups were a lot smoother.
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