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Enabling enthusiasts and racers to extract the potential from their engines
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When asking for technical help at the very least let us know the version of firmware you are running.
Cliff's Calibration (Mapping) Guide is a MUST READ: http://www.vemssupport.com/forum/index.php/topic,97.0.html
Recent posts
#31
Wiring & Sensors / Re: v3.6 + LSU4.9 + Wheel spee...
Last post by Jim_W - October 28, 2023, 01:13:59 PMThanks for correcting me on that. I see I made an error on my wiring diagram and put pump- on pin 8 instead of pin 7 where it belongs.
#32
Wiring & Sensors / Re: v3.6 + LSU4.9 + Wheel spee...
Last post by jrussell - October 27, 2023, 04:30:38 PM4.2 and 4.9 pins on the ECU does not change at all. The one change is a 27k pull-up is needed on the nernst to 5V. No pinout changes at all. Not sure where you're getting that information.
There's some information here: https://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FWBSensor
And a PDF of the sensor pinout and even lists the ec18 connector locations, which match LSU4.2: https://vems.hu/download/sensors/LSU4.9/LSU4.9_pinout.pdf
There's some information here: https://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FWBSensor
And a PDF of the sensor pinout and even lists the ec18 connector locations, which match LSU4.2: https://vems.hu/download/sensors/LSU4.9/LSU4.9_pinout.pdf
#33
Wiring & Sensors / v3.6 + LSU4.9 + Wheel speed
Last post by Jim_W - October 27, 2023, 02:07:15 AMWhen upgrading to the LSU4.9 sensor when the original board was built for LSU4.2 one of the wideband wires conflicts with the wheel speed input. Can anyone point to how to connect a wheel speed sensor after upgrading to LSU4.9?
#34
Ignition / No missing tooth camsync
Last post by Weirdbeard - October 23, 2023, 08:36:04 AMHi, sorry I'm new to all this, Ive searched on here but cant find the answers.
I'm starting to set up a Vems v3 I was given, it was ordered for a BMW S65 with 8 igbt for coils, dual lsu4.9, no egt, crank vr, 4 hall cams and analogue multiplexer.
Question is can set it up for sequential with a 12 tooth (no missing teeth) crank wheel and single tooth cam? And which cam should i use? There is a single tooth on each cam, both close to tdc but opposite phases. Its a 1uzfe v8.
I've fitted a hall sensor for the cam and retained the vr sensor for crank. I get a nice even trigger log Showing each trigger on the crank between each cam trigger and all 8 ignition falling ignition. But where is tdc among this? How do i determine number 1 cylinder? I have a bluepoint strobe but this wont work on cranking so will try and borrow a different one. I have spark using the test function,and also if cranking with a plug out.
I'm starting to set up a Vems v3 I was given, it was ordered for a BMW S65 with 8 igbt for coils, dual lsu4.9, no egt, crank vr, 4 hall cams and analogue multiplexer.
Question is can set it up for sequential with a 12 tooth (no missing teeth) crank wheel and single tooth cam? And which cam should i use? There is a single tooth on each cam, both close to tdc but opposite phases. Its a 1uzfe v8.
I've fitted a hall sensor for the cam and retained the vr sensor for crank. I get a nice even trigger log Showing each trigger on the crank between each cam trigger and all 8 ignition falling ignition. But where is tdc among this? How do i determine number 1 cylinder? I have a bluepoint strobe but this wont work on cranking so will try and borrow a different one. I have spark using the test function,and also if cranking with a plug out.
#35
Fuel Injection / Re: Strange stuttering while d...
Last post by pikard - September 30, 2023, 12:27:31 PMHello GintsK,
Thank you for your help and advice.
I will start with added ignition first.
For the injection angle I have to make myself knowlegeable about the right angle.
Thanks
Marcus
Thank you for your help and advice.
I will start with added ignition first.
For the injection angle I have to make myself knowlegeable about the right angle.
Thanks
Marcus
#36
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by Machismo - September 28, 2023, 03:19:32 PMYes they are bouncing "minimum to maximum" when engine is at idle and even when engine is off, there is still a bit some bouncing activity going on on some cylinder displays.
#37
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by z0tya - September 18, 2023, 03:47:43 PMI have had a log with disconnected injectors at first the 1st cyl then 2nd and so on, but i have not found it :(
But your log a bit wierd for me especially the before cran section, why individual power boucing and not stay at -512usec...
But your log a bit wierd for me especially the before cran section, why individual power boucing and not stay at -512usec...
#38
Fuel Injection / Re: Strange stuttering while d...
Last post by GintsK - September 14, 2023, 09:34:45 PMSeems you drive on too retarded ignition for that load point. No? When engine gets degree more, it gain power and go in cycle back - forth.
Try add ignition there. Probably at that point you want 20...30deg. You can avoid steep Ignition table by retarding ignition with MAT/TPS table at low throttle openings but keep high values in RPM/MAp ign table. It helps for driveability.
Second thing to try is to change Injection angle. In 720 cycle there is one point where something like this happens.
Try add ignition there. Probably at that point you want 20...30deg. You can avoid steep Ignition table by retarding ignition with MAT/TPS table at low throttle openings but keep high values in RPM/MAp ign table. It helps for driveability.
Second thing to try is to change Injection angle. In 720 cycle there is one point where something like this happens.
#39
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by Machismo - September 14, 2023, 07:09:34 PMYes what I was reading that people had success with 4 and 6 cyl. So those are confirmed, I think.
Sure, I disconnected now cylinder 1 which should be channel 0. Started log, started car, let it run on idle for a moment then I revved to couple of thousand rpm:
http://vems.hu/download/VemsTune/bugreports/Report-2023.09.14-21.03.19.zip
I am wondering, if you disconnect one of your four cylinders, do you see it's then completely "out" in the power display, or is there a little bit power still shown? If you have interest and have not tested without one cyl before, try it with both idle and lets say 2500 rpm.
Sure, I disconnected now cylinder 1 which should be channel 0. Started log, started car, let it run on idle for a moment then I revved to couple of thousand rpm:
http://vems.hu/download/VemsTune/bugreports/Report-2023.09.14-21.03.19.zip
I am wondering, if you disconnect one of your four cylinders, do you see it's then completely "out" in the power display, or is there a little bit power still shown? If you have interest and have not tested without one cyl before, try it with both idle and lets say 2500 rpm.
#40
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by z0tya - September 13, 2023, 02:16:11 PMI have only experience with 4 cyl.
Could you upload some log?
Could you upload some log?