BMW M50 B25 Turbo
Early 2018 Purchased a Vems v3/15130 from Pieter, Vems V3 with lsu4.9, Sensors, and Wiring Harness and relays etc.
A friend mounted everything inside the car and connected it like it is shown on the Vems papers (electrician)
- please show the papers and updated notes related to this loom (often handwritten on printed paper, that is OK, please scan, or type; list form is preferred)
- claimed Done (note: unfortunately unclear) Only who installed can support it if no wiring list: text list needed for clarity, organized by function, eg. Vanos ... see MembersPage/MarcelBMW_M50B25_Turbo/Wiring
- he wired up already alot Vems ecus in several cars.
- good, he can certainly fix the setup
- note: notes + measurements of this very loom would be interesting in this case.
- Be very clear, eg. with the coolant temp (what is exact reading, how it changes from N Celsius to M Celsius, abruptly, or slowly) when ground-shorting injout or ignout (driving fuelpump relay)
Please fill in
MembersPage/MarcelBMW_M50B25_Turbo/Wiring
In my case its a 1985 BMW E30 with a m50b25 Turbo Engine... (just for info)
April 2018 Pieter came to his Garage for the First Startup and Calibrate etc. Everything worked without any issues.
TODO:
- vemslog of running engine --> From that day i have none
- or at least vemscfg of working setup
Dyno Mapping was done 06/2018 and also worked pretty good with the ecu.
I Drove then for around 5000km with this ecu without any Problems.
TODO:
- vemslog and vemscfg of running engine of working setup:
DB LOG REVIEW:
- v3.3_u015130-2018.11.01-12.57.50.vemslog
- taken using VemsTune 1.5.46 (2016-06-05) on 2018-11-01 12:57:50
- no obvious config or realtime data problems present.
Problems start
2019 Januar 2019 I changed the Cam setting from the Engine and built in a Water Meth injection.
Dyno Mapping was done also in Januar. worked again good so far. Misfiring at End of the day above 1.8 Bar Boost.
TODO:
- wiring of the changes --> Nothing changed on the wiring. Its an extern Controller from the WMI
- vemslog and vemscfg of running engine of the now problematic setup
- vemslog or vemscfg saved after tuning, and saved after the problem experienced would be useful: perhaps there is some unintentional change
- rarely unintentional config change can be due to cosmic ray or similar, but if it happened repeatedly, other conditions are suspected; like new fw with old VemsTuneVersion or forgotten ini-update; or alternator over voltage spikes, or wiring problem.
DB LOG REVIEW:
- v3.3_u015130-2019.02.23-14.07.36.vemslog
- taken using VemsTune 1.5.57 (2018-01-04) on 2019-02-23 14:07:36
- many config changes compared to previous known good v3.3_u015130-2018.11.01-12.57.50.vemslog
- MAP sensor has been changed
- TPS sensor has been changed
- FP channel has been changed from p259/1 to I259/2
- Various sensors added, Fuel Pressure, Oil Pressure, Oil temp
- ign_dwellmap has been reconfigured
- many mapping changes
- review of the driving around log does not show any bad behavior. some miss fire might be present but that is unrelated to the Fuel Pump turn off/on problem.
How do we know if it was good originally (just the problem didn't show up yet), or the problem was hiding for some time (and perhaps the first symptoms appearing right after the methanol install might be coincidence) - this can be tricky, need to review much detail (not much available so far, though), and review config with the setup + loom details known we really depend on useful info in MembersPage/MarcelBMW_M50B25_Turbo/Wiring
Tricky, because any wiring problem (or even some HV wire) might appear to cause problem after some time and possibly work for hundreds or thousands of hours before that;
- => so "it worked for some time" simply does not mean the setup was compliant ever (but maybe it was originally, and something turned bad later)
- if impossible to review (without the details), the saying "it worked" does in no way substitute the setup + wiring details and measurement and config that can be verified and attempted to reproduce.
Please take a log of the actual problem situation
In Email the problem was described as follows:
- Now 12.01. last Sunday i wanted to drive a little round.
- Let again run warm and at 70° watertemp the Engine shut off.
- Started again and saw it runs well for 3 minutes.Died again.
TODO:
Please provide vemslog of the follwing situations:
- engine warmup from cold to engine dies.
- engine restart after first die, until dies again.
Please upload the logs to two new directories in your project root dir (/MarcelBMW_M50B25_Turbo) in the FileArea cleary starting the situation in the file name.
After receiving the logs i will review again and assist in pinpointing the problem. Thanks!
I posted two logs above this thread.
I dont get how to send this to the "project root dir".
This ecu in the new logs is btw the second ecu (sn17080) that Pieter send to me last year after the Problems shown up.
DB LOG REVIEW:
- v3.3_u017080-2020.01.12-13.24.35.vemslog
- taken using VemsTune 1.5.57 (2018-01-04) on 2020-01-12 13:24:35
- at around 0.34.170 we can see adc_ch7 Fuel Pressure starting to drop indicating Fuel pump loosing power drops with e-curve shape so normal pressure loss not sensor problem, Fuel pressure stable in preceding part of log at ~4.07 Bar.
- customer indicates that after restarting engine with bridged pump relay later, FAN relay also does not engage.
- Most likely problem: Loom relay +12v feed wires bad connection in relay socket where FP/FAN relay splits, this would lead to this symptoms.
- FAN/FP working again with engine not running is likely from vibration during engine running.
Checked that. Fuel pumps/ fan work when i use the (disconnected from vems) output cable and switch it to ground without problems when the Engine runs.
So that cant be a wiring problem from the relays or cables.
The output from the vems shuts the ground off
And then the relay shuts off the power to the fuel pump.
So, today i wanted to drive a small round after put in the vems again.
Checked of course again the things that are written above.
2 minutes the engine runned and then died.
So iam still at the point of knowing nothing.
Summary:
- worked fine
- After changes => problems.
- Let's see the exact HW, wiring and config changes, including the before/after state so we can review, reproduce and give hints.
- this is the only professional way to do things: collect the relevant info in a way it is possible to review, edit, add, extend, ...
This is a pic from the wiring in the car
https://www.bilder-upload.eu/bild-bf374b-1579205711.jpg.html
ECU removed for the photo so we can see something.
Universal Harness is from Vems.
The wiring is always adapted for the actual install.
I listed here 2 log links.
The firsr one is with the running mapped engine and no Problems.
The second log link is with the Problem.
But i switched the relays manual for this day.
Is it possible, that EC36 receptacles got damaged during the install, or measurements (from DVM probe), and cannot provide reliable connections any longer ?
- just a guess, but that would explain several things.