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Recent posts
#31
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.
#32
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
#33
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.
#34
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...
#35
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.
#36
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.
#37
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?
#38
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by Machismo - September 12, 2023, 05:44:35 PMThanks for the swift answer.
I checked that but I had already the right selection there: "Realtime Data Option: ADC/Individ.power"
I now, just for testing put it to "Individ. knock data" which caused the individual power to stop showing anything. (like you said)
So, my problem is not that it wont show anything, the problem is, it shows mostly garbage. For example that if one cylinder does not ignite, I do not see it from the individual power display, they seem all pretty even at 2000 rpm. Only if I disconnect two cylinders, I start to see some less power in two "bars", but even then, they are the wrong cylinders.
Could it be that knock sensor would create some disturbance, should I disconnect it? I mean, if they are handled by the same circuit.
Edit: I disconnected the knock sensor, did not help, individual cylinder power readings still remain erratic.
I start to think that 8 cylinders has too many events per 60-2 trigger tooth for Vems to really see the differences between cylinders, unless of course someone can confirm that they have successfully used this feature with eight cylinders.
My 3.6 board is one of the very early ones. Could it be my hardware is not exactly the same as it should to be able to handle this?
I checked that but I had already the right selection there: "Realtime Data Option: ADC/Individ.power"
I now, just for testing put it to "Individ. knock data" which caused the individual power to stop showing anything. (like you said)
So, my problem is not that it wont show anything, the problem is, it shows mostly garbage. For example that if one cylinder does not ignite, I do not see it from the individual power display, they seem all pretty even at 2000 rpm. Only if I disconnect two cylinders, I start to see some less power in two "bars", but even then, they are the wrong cylinders.
Could it be that knock sensor would create some disturbance, should I disconnect it? I mean, if they are handled by the same circuit.
Edit: I disconnected the knock sensor, did not help, individual cylinder power readings still remain erratic.
I start to think that 8 cylinders has too many events per 60-2 trigger tooth for Vems to really see the differences between cylinders, unless of course someone can confirm that they have successfully used this feature with eight cylinders.
My 3.6 board is one of the very early ones. Could it be my hardware is not exactly the same as it should to be able to handle this?
#39
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by z0tya - September 12, 2023, 10:36:20 AMIndividual power works only when knock real time data disabled:
Vemstune Inputs/Knock Samplings/Knock real time
Vemstune Inputs/Knock Samplings/Knock real time
#40
Calibration & Mapping / Re: Individual Cylinder Power ...
Last post by Machismo - September 11, 2023, 06:47:30 PMI got excited about this individual power stuff, I have a V8 and when I turned the individual power gauge on it showed all 8 cylinders bouncing around at idle. Then I increased rpm to 2000 and 3000 and the display stabilized showing some cylinders a bit stronger than others. At that point I assumed it works since it looked convincing... Then I disconnected one cylinders coil which made one cylinder went dark. But it didnt change anything! All cylinders still according to the gauge were active. Why it does not work?
I then red this
https://www.vems.hu/vt/help/v3/datalog/individual_power.html
There is info about the association of the numbers, but no mention of 8 cylinders. Why the info is missing, is it supposed to work? I have a 60-2 trigger wheel, 3.6 board and latest firmware etc. So little information available about this subject, please enlighten me. I really would need this to work to be able to tune my engine better.
Oh one more thing, if I just power on Vems, some of the individual power gauges start to bounce erraticly, where does that come from? They should be at zero when the engine is not rotating.
I then red this
https://www.vems.hu/vt/help/v3/datalog/individual_power.html
There is info about the association of the numbers, but no mention of 8 cylinders. Why the info is missing, is it supposed to work? I have a 60-2 trigger wheel, 3.6 board and latest firmware etc. So little information available about this subject, please enlighten me. I really would need this to work to be able to tune my engine better.
Oh one more thing, if I just power on Vems, some of the individual power gauges start to bounce erraticly, where does that come from? They should be at zero when the engine is not rotating.