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High Altitude and 24# injectors Input needed?

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    #1

    High Altitude and 24# injectors Input needed?

    It appears that in a side by side comparison between my car

    E30 S50 Pulleys LTW flywheel, 24# inj, 3.5 maf open filter, 2.25 Dual exhaust, headers and TRM chip to support the mods as well as a curb weight of just under 2700#

    and my brothers car

    E36 M3 TMS chip 21.5# inj, 3.5 maf, Factory exhaust, with a CAI, no lightening.

    results in me being able to pull away but ever so slightly.

    If I launch on him the weight difference is what really sets me out but if we roll it is a tight race. I am begining to wonder if the tuning is to aggresive for my nearly 5000ft altitude. I have a wide band coming to test the afr's and I will swap in his chip and injectors to check the two against each other. Has anyone else run into issues living at altitude with an agressive 24# tune?
    1989 332IS -S-Fiddy Four-Some weight removed.
    5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.
    Tags: None
    #2
    I just don't see why an S50 would ever need that big of injectors or exhaust.
    BimmerHeads
    Classic BMW Specialists
    Santa Clarita, CA
    www.BimmerHeads.com

    Comment

      #3
      You will probably be running rich due to less oxygen, depends how much your car can correct for the extra fuel you are dumping in there.

      - E30, DSM, Golf R, Mazda 3 Skyactiv

      Comment

        #4
        Originally posted by blefevre View Post
        You will probably be running rich due to less oxygen, depends how much your car can correct for the extra fuel you are dumping in there.
        Exactly. As soon as I get the wideband in I will report the results.
        1989 332IS -S-Fiddy Four-Some weight removed.
        5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

        Comment

          #5
          So it turns out my buddy sold his afr gauge and wideband. So plan B is a few local dunk runs with both setups to determine power output at the wheels, afr at the tail and maybe explain the difference.
          1989 332IS -S-Fiddy Four-Some weight removed.
          5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

          Comment

            #6
            Just did a compression check to be sure that the engine was healthy. Compression was Standard and within 3lbs across the engine. The search continues.


            I reset the computer to see if I could locate any new codes. After a quick test drive I did get a flicker with a 1215 code stored. I will swap out my afm tomorrow and see if it changes anything. I am noticing that it just isn't very rabid over 5500 rpm like it used to be.

            So new input this morning. I disconected the battery over night and then recon. this morning went out to grab bagels and I wsa still noticing slight hesitation at 5500 plus. I then disconnected the maf at the bagel shop and drove halfway home. With the maf disconnected the engine would not rev very well above 4500 and if I gave it more than half throttle it would sputter and lose power. I then reconnected the maf and it seems like the flatspot got worse. Anyone know what it means when you go to the rich map (no maf) and it wont really rev. I am begining to think that I have a fuel delivery issue.
            1989 332IS -S-Fiddy Four-Some weight removed.
            5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

            Comment

              #7
              Why dont you meter the V coming from the maf on the two cars to see if they are pulling the same amount of air. Then you will see which engine is really running "stronger".

              If they are different then you have a place to see where the differences are.
              Past Car : E30 S50 6 Speed 5 Lug 3.73
              Current : Z3 S50 OBD2 (Smog Legal) 6 Speed BBS RN Dual Ear Diff
              ___________________________________________
              BNB Designs
              Engine Swaps, Fabrication, Innovation, General Repair
              Richmond CA
              Julian 848-248-8029

              Comment

                #8
                You'd be better served by taking the car to a dyno where you can get the A/F curve under controlled conditions. My guess is that the tune just isn't right. And I'll second the though that you don't need 24lb injectors.

                If the tune is right and the engine is in good condition your 2700lb car (and presumably a 3.73 differential) should just walk away from even a tuned full weight E36 M3.
                The car makes it possible, but the driver makes it happen.
                Jim Levie, Huntsville, AL

                Comment

                  #9
                  Originally posted by jrdeamicis View Post
                  Why dont you meter the V coming from the maf on the two cars to see if they are pulling the same amount of air. Then you will see which engine is really running "stronger".

                  If they are different then you have a place to see where the differences are.
                  Sorry please forgive my ignorance but by V you mean voltage right?
                  1989 332IS -S-Fiddy Four-Some weight removed.
                  5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                  Comment

                    #10
                    I beleive I have resolved the issue. It appears that when i did my vanos I accidentally placed my primary timing gear one tooth off. So it was retarded 5 degrees of timing.
                    It runs great now.
                    1989 332IS -S-Fiddy Four-Some weight removed.
                    5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                    Comment

                      #11
                      Well it appears that my timing was fine. I can still barely pull. According to the et calculator even if I made the exact same power as the e36 I should still beat him by a half a second in the 1/4 mile. I am stumped so we are going to do some 30-60,s with both chips and compare the times.
                      1989 332IS -S-Fiddy Four-Some weight removed.
                      5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                      Comment

                        #12
                        VSS wire in correctly?

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                        Needing a harness adapter or wiring help? Check it out: also have 24v motor mounts, E30 M3 covers and E36 ECU mounts!
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                        OBD2 Tuning Available! OBD2 E36, S54 Swap, S62 Swap, etc: tuning@MarkertMotorWorks.com Dyno Thread

                        Comment

                          #13
                          I did my wire in so long ago that I will have to check.
                          1989 332IS -S-Fiddy Four-Some weight removed.
                          5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                          Comment

                            #14
                            Also my check engine light is fully functional, wouldn't there be a check engine light? I am still getting a MAF code.
                            1989 332IS -S-Fiddy Four-Some weight removed.
                            5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                            Comment

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