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Just curious what octane are you using for your 325is? (87')

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    Just curious what octane are you using for your 325is? (87')

    I've been filling up with 91 cause I believe the manaul says it, but what does everyone fill up with? I live up here in the Pacific Northwest so I'm not sure if that has any effect on which octane I should be using.
    26
    91
    38.46%
    10
    89
    15.38%
    4
    87 (I don't think our car can take that, haha)
    46.15%
    12
    sigpic

    #2
    91. Mine pinged with anything less around here.
    Adam Fogg- '88 M3

    Common sense- It's the new 'gifted'

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      #3
      run mine on 87 ALLLL the time, no pings or anything, car runs great and fast.

      don't have 91 around here just 87, 89, and 93. should prolly put 89 in it just to be safe though.


      Mike Fritz

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        #4
        Too much octane is bad. Higher octane ratings mean lower combustion temperatures: more unburned fuel. That is how detonation is controlled, by reducing temperatures in the combustion process.

        Read this http://auto.howstuffworks.com/question90.htm so you understand what octane means.

        M20's are a low compression ratio engine. Higher octane gas is a waste (and by "waste" I mean fucking stupid) unless you are chipped and have radically advanced your timing curve, or have a shaved head/block/different pistons whatever.

        Luke

        Closing SOON!
        "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

        Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

        Thanks for 10 years of fun!

        Comment


          #5
          Originally posted by StereoInstaller1
          Too much octane is bad. Higher octane ratings mean lower combustion temperatures: more unburned fuel. That is how detonation is controlled, by reducing temperatures in the combustion process.

          Read this http://auto.howstuffworks.com/question90.htm so you understand what octane means.

          M20's are a low compression ratio engine. Higher octane gas is a waste (and by "waste" I mean fucking stupid) unless you are chipped and have radically advanced your timing curve, or have a shaved head/block/different pistons whatever.

          Luke
          I use 93 religiously with 3.5 oz of Acetone to every 10 gallons in both of my cars. Unburned fuel is also caused by the surface tension of gasoline and how well it can be ionized.

          The acetone helps to break the surface tension of the gasoline much like how jet dry in your dish washer breaks the surface tension of water. It also causes much more of the gas to be ionized when injected into the combustion camber.
          Last edited by RobertK; 01-25-2006, 01:52 PM.

          Comment


            #6
            91 in mine, although I require it due to my Mark D Chip

            Comment


              #7
              89, not too high, not too low
              sigpic

              Comment


                #8
                Originally posted by Ritalin Kid
                I use 93 religiously with 3.5 oz of Acetone to every gallon in both of my cars. Unburned fuel is also caused by the surface tension of gasoline and how well it can be ionized.
                I think he means 3.5 oz per tank.
                I do the same in my E36, 4 oz per tank.
                Originally posted by KingB
                Scratch my back and I buy a prostitute for you, to rub your balls. HAHA now thats some funny shit.

                Comment


                  #9
                  Originally posted by HST
                  I think he means 3.5 oz per tank.
                  I do the same in my E36, 4 oz per tank.

                  Fixt!

                  Comment


                    #10
                    I run 93 due to the chip (JC). I wish we had something between 93 and 89 though.

                    "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

                    Comment


                      #11
                      If your car runs fine on 87, DO NOT use higher octane gas. It will eat up your cat faster, lower your gas mileage, and provide LESS power.
                      Michael Spiegle

                      '01 Ford Escape / Daily Driver
                      '99 M3 / Track Car
                      '87 325is bronzit / wtf car
                      '06 Daytona Triumph 675 / Daily Rider

                      Comment


                        #12
                        Originally posted by mspiegle
                        If your car runs fine on 87, DO NOT use higher octane gas. It will eat up your cat faster, lower your gas mileage, and provide LESS power.
                        I'm going to give 89 a shot and see how the car runs... Just alwasy wondered even though the manual instructed 91 for the car.
                        sigpic

                        Comment


                          #13
                          Originally posted by optimusp517
                          I'm going to give 89 a shot and see how the car runs... Just alwasy wondered even though the manual instructed 91 for the car.
                          The manual does not call for any higher than 87 octane for 325s. Only m42 and s14 powered vehicles require 91 octane.

                          I only put 87 octane in my car. never had any problems with it.

                          -Erik

                          Comment


                            #14
                            Originally posted by Ritalin Kid
                            I use 93 religiously with 3.5 oz of Acetone to every 10 gallons in both of my cars. Unburned fuel is also caused by the surface tension of gasoline and how well it can be ionized.

                            The acetone helps to break the surface tension of the gasoline much like how jet dry in your dish washer breaks the surface tension of water. It also causes much more of the gas to be ionized when injected into the combustion camber.
                            How could you possibly need 93 octane and acetone on a stock M20?

                            RISING EDGE

                            Let's drive fast and have fun.

                            Comment


                              #15
                              The manual says 91 but it does not mean 91 OCTANE. I use 87 all the time no problems and ALSO 3 oz acetone to every 10 gallons.... About 20 mores miles out of a tankful after I started it.
                              1990 Black 325is

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