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    e30 cat

    i have a 1989 325is and it doesn't have a cat. will this make cause me to get poor gas mileage? plus what should a 1989 325is get on average in the city?

    #2
    prob anywhere from 18-25 depending on how you drive auto/stick
    88 325ic ~~~> Rusty and ugly
    85 E ~~~> RIP

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      #3
      about 15 mpg
      -Andy

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        #4
        Originally posted by dashboardmonkey View Post
        about 15 mpg
        huh?
        Build thread

        Bimmerlabs

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          #5
          Originally posted by nando View Post
          huh?
          well that's what i get anyway

          i drive it pretty hard tho
          -Andy

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            #6
            You will not get worse gas mileage without it. Because the car is obd1, the o2 sensor is before the cat only and will not care if there is a cat or not. The exhaust will actually have slightly less restriction because there is no cat, so mileage should stay close to stock or tiny bit better.
            Originally posted by cabriodster87
            "Honey? What color is this wire? Is it the same as that one? Are you sure? I don't believe it. OK, it works. Thank you sweetie."
            Originally posted by Kershaw
            i've got a boner and a desire to speed.

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              #7
              Originally posted by dashboardmonkey View Post
              well that's what i get anyway

              i drive it pretty hard tho
              I have a thirsty 2.8 liter and on it's worst day I don't get less than 18. lol

              well, except on the track when it's like 8-12..
              Build thread

              Bimmerlabs

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                #8
                15mpg is pretty low there. My '88 iS cammed, chipped and running 19lb injectors only got down to 17-22mpg and I flogged it routinely.
                Need a part? PM me.

                Get your Bass on. Luke's r3v Boxes are here: http://www.r3vlimited.com/board/showthread.php?t=198123

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                  #9
                  i put 8 gallons in and got about 150 mile that is about 17 or 18 miles per gallon. i was confused because my OBC was reading 10.5 or so. as i looked further into it i realized that the read out was 10.5 L:100. i found out that that is letters per 100 kilometers.

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                    #10
                    In the winter i'm down around 22-23 mpg. Summer i'm up around 25mpg.

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                      #11
                      I'm down around 15 mpg in my eta. But that's because im missing things like the o2 sensor and what not.
                      sigpic

                      I wear a suit, I do coke, and I ski...:D
                      That's why I drive a BMW

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                        #12
                        Originally posted by nando View Post
                        I have a thirsty 2.8 liter and on it's worst day I don't get less than 18. lol

                        well, except on the track when it's like 8-12..
                        Yeah 18 or 19 is about what i get when i'm foot heavy... and the car runs rich on boost. 15mpg is just nuts.

                        Dave
                        E30 Dinan Turbo

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                          #13
                          no cat < Fuel mileage

                          I was up above it, Now I'm down in it ~ Entropy - A Build thread.
                          @Zakspeed_US

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                            #14
                            Please correct me if im wrong but...
                            How does a cat effect gas mileage on a pre OBD car???
                            An OXYGEN SENSOR will effect fuel economy not a cat. The cat does NOTHING to effect fuel trim.
                            If the car had a post cat O2 sensor it would effect fuel trim but our cars only have one and its BEFORE the cat.
                            [IMG]http://www.r3vlimited.com/board/

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                              #15
                              a reduction in exhaust backpressure could make it run a little leaner.. but if you just removed the cat and left everything else stock, you probably couldn't measure the difference.
                              Build thread

                              Bimmerlabs

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