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  • Throttle closure at WOT

    Morning- I had to do some work on the car (water pump, t-stat, valve cover gasket) and added a turbosmart diverter valve. In the logs, it looks like the car is building boost but the throttle appears to be closing during 3rd gear pulls. Any advice? Thanks


    Attached Files
    '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

  • #2
    Looks like you've been playing with the JB4 user adjustment values. Try setting them all back to the default values and upload a log of map 5 for review.

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    • #3
      I think I got everything back to default and didn't get the stutter...let me know if I missed anything and what you think. Thanks
      Attached Files
      '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

      Comment


      • #4
        Looks pretty good but trims are maxing out and forcing you lean down low. What flash/fuel are you running?

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        • #5
          Thanks Steve. I have the e85 BEF and I am running full e85 currently
          '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

          Comment


          • #6
            What are you running for fueling? I don't see PI running. You can bump your FOL up to 90 though.

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            • #7
              Oh sorry, I am running a dorch Stg 1 HPFP, no PI. I will bump the FOL and relog.
              '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

              Comment


              • #8
                Good morning- Did several more runs and the throttle closures popped up again. Any suggestions?
                Attached Files
                '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                Comment


                • #9
                  You didn't change your FOL.

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                  • #10
                    Sorry Steve, I changed it but it grouped them all showing the FOL as 50. I will get a separate log with FOL at 90. The issue occurred at both settings, 50 and 90.
                    '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                    Comment


                    • #11
                      Trims are lower to begin with so I'm guessing you change it after the first pull...so set it back and leave it there.

                      I'm guessing you have some sort of boost leak, collapsing intake pipe, or ??? WGDC is really high even when boost drops.

                      It could be the throttle closure as well but I also see DME_BT is dropping. I'm going to get another opinion on this but first do a good log with FOL set correctly.

                      Click image for larger version  Name:	image.png Views:	1 Size:	133.6 KB ID:	818709

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                      Video of our Stage 2 LPFP upgrade installation.

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                      • #12
                        Hi Steve I did a couple 3rd gear pulls and a couple in 2nd and had trouble each time. I set FOL at 90. Any help troubleshooting is appreciated!

                        Attached Files
                        '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                        Comment


                        • #13
                          What flash do you have loaded?

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                          • #14
                            It should be the e85 BEF but I am going to reload it just to make sure.
                            '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                            Comment


                            • #15
                              Hi Steve, I have confirmed that the BEF flash is the e85 map in MHD.
                              '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

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                              • #16
                                Okay...thanks.

                                This is strange, can you do a log on map 2, we want to see if it's boost target related.

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                                Video of our Stage 2 LPFP upgrade installation.

                                BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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                                • #17
                                  Hi Steve
                                  did a quick pull in map 2 and it felt proper.
                                  Attached Files
                                  '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                  Comment


                                  • #18
                                    Here are some additional logs. I did some with map 2 and map 7 and the car seemed to feel ok
                                    Attached Files
                                    '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                    Comment


                                    • #19
                                      You are correct, DME_BT looks solid.

                                      What year is this vehicle?

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                                      Video of our Stage 2 LPFP upgrade installation.

                                      BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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                                      • #20
                                        It is a 2014. Any thoughts on what's going on with map 5? It should adjust to the e85 and target boost accordingly, right? Could it be an O2 sensor or unmetered air leaking in somehow? But that would show up in all the maps, right? Just thinking out loud...
                                        '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                        Comment


                                        • #21
                                          Fresh log on map 5 for me to review?

                                          Also, if you continue to have intermittent issues, double check that your OBDII cable doesn't have stretched pins.

                                          Click image for larger version

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                                          Click on our banner to visit our website!
                                          Video of our Stage 2 LPFP upgrade installation.

                                          BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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                                          • #22
                                            Good morning! Confirmed the pins are not deformed on the obdii connector. Did several pulls and everything felt fine until it started to target higher boost numbers. Last pull, cylinder 5 and 6 shut down for misfires. Thinking spark plug or coil pack maybe?
                                            Attached Files
                                            '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                            Comment


                                            • #23
                                              HPFP can't hang...that's your next week link.

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                                              Click on our banner to visit our website!
                                              Video of our Stage 2 LPFP upgrade installation.

                                              BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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                                              • #24
                                                So dial back the e85 and go forth and be fruitful?
                                                '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

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                                                • #25
                                                  Correct, or add Meth, CPI, or port injection.

                                                  Weak...not week.

                                                  Click on our banner to visit our website!
                                                  Video of our Stage 2 LPFP upgrade installation.

                                                  BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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                                                  • #26
                                                    I added enough gasoline to get about e50 and the HPFP numbers look much better. It's still dipping in 3rd gear pulls but what strange is if I start in 2nd and go into 3rd, it doesn't seem to have any issue.
                                                    Attached Files
                                                    '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                                    Comment


                                                    • #27
                                                      Correct, as long as it stays above 10 or so, it's generally okay.

                                                      Click on our banner to visit our website!
                                                      Video of our Stage 2 LPFP upgrade installation.

                                                      BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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                                                      • #28
                                                        Hi Steve, sorry I wasn't clear in my previous post. The HPFP is fine, but the throttle is still closing and boost dropping in 3rd gear pulls but when I start in 2nd and go through 3rd it maintains boost fine.
                                                        '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                                        Comment


                                                        • #29
                                                          Looks like DSC, you can see RPM dip up then DME drops its boost target. Throttle is used to regulate boost to target.
                                                          Attached Files
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                                                          • #30
                                                            Thanks Terry, are you thinking it's a malfunction of the DSC because I believe all these were done in Sport+ and DSC would be off, correct?
                                                            '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                                            Comment


                                                            • #31
                                                              There seems to be two types of logs you're getting. One shows no issue with throttle...the other is big adjustments. Not sure what the difference is between the two but if may very well be DSC. Make sure traction control is off but you don't have to completely shut if off.

                                                              Click on our banner to visit our website!
                                                              Video of our Stage 2 LPFP upgrade installation.

                                                              BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

                                                              Comment


                                                              • #32
                                                                Yes, it is very odd. The issue only seems to occur with Map 5 when targeting higher boost and only when starting WOT in 3rd. If I start in 2nd and pull through 3rd, it seems to have no issues. In map 2 and map 7 it seemed to run fine regardless. I tested the car in Sport + and in Sport + and pushing the DSC button, with the same result. 3rd gear it stops building boost at about 3500 RPM, start in 2nd- it is strong through the entire RPM range. I didn't make new logs since it's been the same but will if you need it.
                                                                '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

                                                                Comment


                                                                • #33
                                                                  Have we hit a dead end on this one?
                                                                  '14 435xi - FMIC- BMS intake - JB4 + FF + WG plug - MHD, Dorch stg1 HPFP, PR Coils

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                                                                  • #34
                                                                    Ultimately the DME is pulling boost and I'm not sure why if you have traction control off. You would have to work with Terry on it.

                                                                    Click on our banner to visit our website!
                                                                    Video of our Stage 2 LPFP upgrade installation.

                                                                    BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

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