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What to expect from HFM, injectors, chip?

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    #16
    My M54 originally came with a 3 1/2" MAF and a larger throttle body than the OBD1 motors.

    Even with OBD1 components, I'm making more HP than a stock M54.

    I've done a ton of datalogging on it and found that the MAF isn't getting close to saturation (plenty of signal headroom left) but I am starting to draw a slight vacuum in the manifold at higher rpms. That is a result of the entire intake tract, including throttle body, MAF and air filter.

    I suspect that the combination of the larger, stock throttle body and 3 1/2 MAF may yield me a few ponies.

    Why would they give the 3.0 M54 a larger TB and MAF than the stock S50? Must be a reason...

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      #17
      They probably thought it was better so they used it. M54s are Drive By Wire, so it might also have something to do with that.
      1987 BMW 325is | Frankenmotor S50 | Supersprint Replica Headers | K&N Intake | Gutted Stock Midpipe | Zimmermann Rotors | Stainless Brake Lines | Porterfield Racing Pads

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        #18
        love it
        sigpic

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          #19
          Originally posted by triggrhaapi View Post
          Really all that the MAF and injector combo does is allow a richer mixture in the mid to high range that allows for a mildly more aggressive ignition map.

          There isn't really a big gain to be made there, because the cam isn't aggressive enough to draw more air really, and the fuel isn't high enough octane in this country to make a more aggressive ignition map feasible.

          With higher octane fuel, or ionic sensing ignition, there would still be significant gains to be made.
          No, what the MAF does is give tuners something else to charge you for. Maybe it flows a little more air, it probably doesn't hurt.

          You can get whatever mixture you want with whatever MAF (and injectors, as long as they are big enough) you want.

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            #20
            I am also looking at an electric power steering pump. It will give me another 5+ hp across the entire power band.

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              #21
              Originally posted by russiane30 View Post
              love it
              Cut down the elbox 3 inches, clock your maf connector to the 2 o clock position and run the 3 in cutoff in front of the MAF to the filter. This will result in better flow and allow the MAF to meter correctly

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                #22
                Originally posted by matt View Post
                No, what the MAF does is give tuners something else to charge you for. Maybe it flows a little more air, it probably doesn't hurt.

                You can get whatever mixture you want with whatever MAF (and injectors, as long as they are big enough) you want.
                Lazy tuning maybe? Maybe they did it because a faster throttle response makes people think the car is faster? I never bought it myself, I'm still running the stock MAF and injectors. I don't need more fuel until I can get a lot more air. For that I need cams.
                1987 BMW 325is | Frankenmotor S50 | Supersprint Replica Headers | K&N Intake | Gutted Stock Midpipe | Zimmermann Rotors | Stainless Brake Lines | Porterfield Racing Pads

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                  #23
                  Anyone with experience with the hfm/injectors/chip combo wanna throw out a butt-dyno guesstimate?
                  S50'd

                  Originally posted by TDE30
                  What is this faggy shit I have happened upon?
                  Originally posted by slammin.e28
                  I can always live in a M3. Can't M3 a house.

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                    #24
                    did you reset your dme with a peak reset tool or equivalant? i don't care how many injectors or harnesses you replace, if you don't reset the code in your dme, it will never go away. i think it is very common to see injector 1 failure with a swap. i had it too. in everything i read above, i didn't see anything about you mentioning resetting your codes.
                    sigpic
                    Gigitty Gigitty!!!!

                    88 cabrio becoming alpina b6 3.5s transplanted s62
                    92 Mtech 2 cabrio alpinweiss 770 code
                    88 325ix coupe manual lachsilber/cardinal
                    88 325ix coupe manual diamondschwartz/natur
                    87 e30 m3 for parts lachsilber/cardinal(serial number 7)
                    12 135i M sport cabrio grey/black

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                      #25
                      Originally posted by flyboyx View Post
                      did you reset your dme with a peak reset tool or equivalant? i don't care how many injectors or harnesses you replace, if you don't reset the code in your dme, it will never go away. i think it is very common to see injector 1 failure with a swap. i had it too. in everything i read above, i didn't see anything about you mentioning resetting your codes.
                      Is this meant for 87e30's thread?

                      '89 Alpine S52 with goodies

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                        #26
                        Originally posted by flyboyx View Post
                        did you reset your dme with a peak reset tool or equivalant? i don't care how many injectors or harnesses you replace, if you don't reset the code in your dme, it will never go away. i think it is very common to see injector 1 failure with a swap. i had it too. in everything i read above, i didn't see anything about you mentioning resetting your codes.
                        yeah, wrong thread?
                        S50'd

                        Originally posted by TDE30
                        What is this faggy shit I have happened upon?
                        Originally posted by slammin.e28
                        I can always live in a M3. Can't M3 a house.

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                          #27
                          I would say you'll see 10-15hp. Maybe a few more than you'd see from the chip alone.

                          It's a nice change for sure.

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                            #28
                            Originally posted by matt View Post
                            I would say you'll see 10-15hp. Maybe a few more than you'd see from the chip alone.

                            It's a nice change for sure.

                            hmm, not quite worth the ~$500 imo. I'll rock it as is for a while longer and work on cleaning up the engine bay for my next project.
                            S50'd

                            Originally posted by TDE30
                            What is this faggy shit I have happened upon?
                            Originally posted by slammin.e28
                            I can always live in a M3. Can't M3 a house.

                            Comment


                              #29
                              Originally posted by e30polak View Post
                              Especially since you can just get your s50 cams reground to Schrick specs for $250-300 and come out with a nice increase in performance.
                              Who does that and how they do it?

                              I bought 6 24# injector from Fuel injector connection on Ebay. it was 129$ for 6. And the HFM was 130$ from a BF.c member. 260 + shipping isn't that bab for 10-15 hp!
                              E30 now S52
                              2008 Suburban LTZ (Family and TT hauler)
                              325xiT (Sold)

                              sigpic

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                                #30
                                yeah, you still need the $250 chip
                                S50'd

                                Originally posted by TDE30
                                What is this faggy shit I have happened upon?
                                Originally posted by slammin.e28
                                I can always live in a M3. Can't M3 a house.

                                Comment

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