Need to UnChip my m20

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  • Kozworth
    E30 Fanatic
    • May 2011
    • 1339
    #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
    • devon.818
      Banned
      • Feb 2011
      • 2937
      #2
      take the 4.10lsd out of the car, that is why you have poor mpg.

        Comment

        • Kozworth
          E30 Fanatic
          • May 2011
          • 1339
          #3
          Originally posted by devon.818
          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

            • CHIF8008
              No R3VLimiter
              • Nov 2010
              • 3447
              #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

                • Kozworth
                  E30 Fanatic
                  • May 2011
                  • 1339
                  #5
                  Originally posted by CHIF8008
                  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, 07:21 PM.

                    Comment

                    • nando
                      Moderator
                      • Nov 2003
                      • 34827
                      #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

                        • whodwho
                          E30 Mastermind
                          • Jun 2008
                          • 1547
                          #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

                            • Kozworth
                              E30 Fanatic
                              • May 2011
                              • 1339
                              #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

                                Comment

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