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Need to UnChip my m20

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    #1

    Need to UnChip my m20

    Just a quick briefing:

    88 325is, stock except for bav auto chip.

    Ive been getting lower mileage then I should (20mpg mostly highway driving, not really mashing it).

    Ive replaced:
    FPR, fixed evap, o2 sensor, air filter, etc etc.. Car idles fine.

    My next approach was to remove my bav auto chip. I read that it can mess the dme up with fuel mapping, and for the time being I really do not need the extra power at 4k-6k.

    Ive read the BAVauto how to, but my question here is: The oem chip that the bav chip takes place of, what is it called? I assume that since its there before, if I were to uninstall the bav chip I would need to reinstall the oem one. Im trying to figure out what to even call it so I ask around to buy one. If it isn't necessary (i wish) then I would just keep it out.

    Lastly, Ive also read the mark d chip gives good 2-4k throttle response? Any views on that to confirm it? I do not like to rev too high, and since its my daily I would honestly rather get more low end torque. Thanks!
    Tags: None
    #2
    take the 4.10lsd out of the car, that is why you have poor mpg.

    Comment

      #3
      Originally posted by devon.818 View Post
      take the 4.10lsd out of the car, that is why you have poor mpg.
      According to the p/o's i have a 3.73lsd.

      Im going to look up how to determine which lsd I have because when you mention it I seem to get solid 4.10 type mileage.

      Comment

        #4
        look under the car to find out what you have. anything can be changed on a car that is 20+ years old. dont expect it to have what it came with factory.

        only takes a few mins to go outside and look at the tag
        -FREEDOM- is cruisin at 80, windows down and listening to the perfect song-thinking "this is it"
        -The Beauty in the Tragedy-
        MECHANIC SMASH!!- (you all know you do it)
        Got Drop?? ;-)
        Originally posted by JinormusJ
        But of course
        E30s are know to be notoriously really really really ridiculously good looking

        Comment

          #5
          Originally posted by CHIF8008 View Post
          look under the car to find out what you have. anything can be changed on a car that is 20+ years old. dont expect it to have what it came with factory.

          only takes a few mins to go outside and look at the tag
          True, I always forget my car is a good 4 years older then me hahah.

          EDIT: its a 3.73lsd

          Any more input on removing my bav chip?
          Last edited by Kozworth; 03-26-2012, 08:21 PM.

          Comment

            #6
            a 4.10 isn't going to give you excessively poor mileage, anyway. Neither will the bavauto chip (I had one).

            the stock chip is called a stock chip. :p

            you just need to know what DME you have.
            Build thread

            Bimmerlabs

            Comment

              #7
              Let me know what ECU you have, I happen to have a few stock chips around :)
              My M20 Frankenbuild(s)
              4 Sale - Fully Built TurnKey Megasquirt Plug and Play EMS

              Comment

                #8
                Im in the middle of logging my mileage a different way.. we will see if it was my quirky gas gauge (seee my other posts) has just been messing my calculations

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