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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
#41
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
#42
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.
#43
Ignition / Re: Using the Stepper Motor Dr...
Last post by Kamuto - September 03, 2023, 11:38:21 PMQuote from: s14nismo on July 26, 2022, 12:53:20 PM
Hi All, its been a long time since i needed to enquire on here, so excuse my ignorance, but i'm resurrecting an old VEMS SR20DET project... My standard nissan COPs are currently driven via the Stepper motor driver (and via the Stock ignitor) but they are now showing signs of failure, so my question is...
Can someone confirm if the VAG COPs (i have some NGK R8 U5014 available) can be driven by the same stepper outputs with no modifications? (with the stock ignitor removed of course).
yes
#44
Ignition / Re: enabling camsync makes ign...
Last post by Kamuto - September 03, 2023, 11:37:44 PMthat's because it's not getting cam signal
#45
Fuel Injection / Strange stuttering while drivi...
Last post by pikard - August 14, 2023, 05:05:09 PMHello guys,
I have a strange problem with my car. It happens almost at about 1600 rpm. While I am just trying to hold the speed the car starts to stutter.
You can download the log file here:
https://drive.google.com/file/d/1mHYLDcOw64xJjy0TpWk3nRLlYwGn2b58/view?usp=drive_link
And here a screenshot:
https://drive.google.com/file/d/1gw9qg_QE2SZAefa6RoIqwCa2v-ELJoLI/view?usp=drive_link
The vems data:
Creator=VemsTune 1.5.57 (2018-01-04)
Version=1.2.38
SerialNumber=v3.3_u022515
First I disabled the EGO correction but it does not solve it.
Next try was to disable the fuel cut and resume but nothing.
After that I played with the MAP filter in the ECU calibration but I had no improvement.
It happens in the 1600 rpm area only. Everything above is fine.
Sometimes it helps to turn the ignition off and on and the car runs fine.
Any ideas?
Thanks in advance
Marcus
I have a strange problem with my car. It happens almost at about 1600 rpm. While I am just trying to hold the speed the car starts to stutter.
You can download the log file here:
https://drive.google.com/file/d/1mHYLDcOw64xJjy0TpWk3nRLlYwGn2b58/view?usp=drive_link
And here a screenshot:
https://drive.google.com/file/d/1gw9qg_QE2SZAefa6RoIqwCa2v-ELJoLI/view?usp=drive_link
The vems data:
Creator=VemsTune 1.5.57 (2018-01-04)
Version=1.2.38
SerialNumber=v3.3_u022515
First I disabled the EGO correction but it does not solve it.
Next try was to disable the fuel cut and resume but nothing.
After that I played with the MAP filter in the ECU calibration but I had no improvement.
It happens in the 1600 rpm area only. Everything above is fine.
Sometimes it helps to turn the ignition off and on and the car runs fine.
Any ideas?
Thanks in advance
Marcus
#46
Modifications and Repairs / Flex Fuel
Last post by Pork Chops - August 03, 2023, 08:49:44 AMHi Guys, I've got an VEMS ECU running a home turbo charged Porsche 3.2 Carrera. It's been built and tuned and runs well. I'm preparing the car for a flex fuel (E85) set up and have modified the fuel system exhaust and intercooler and can't wait to get back to the dyno.
I'm hoping someone can assist with the physical side of getting the flex fuel set up. The ethanol sensor is plumbed into the fuel system, the plug is pinned at the sensor and I've got signal, power and gound wires to the EC18 plug and have the correct female pins and seals. I've been told the sensor ground goes to pin 17, but I need to establish where power is coming from, and lastly I need to get a wire from Wheel speed sensor 2 (which is on the board) to a free pin. Can anyone assist in identifying where this is on the board?
I realise some of these questions may relate to the pinout used in this application but perhaps there is another Porsche PNP user out there that's done this before?
Many thanks.
I'm hoping someone can assist with the physical side of getting the flex fuel set up. The ethanol sensor is plumbed into the fuel system, the plug is pinned at the sensor and I've got signal, power and gound wires to the EC18 plug and have the correct female pins and seals. I've been told the sensor ground goes to pin 17, but I need to establish where power is coming from, and lastly I need to get a wire from Wheel speed sensor 2 (which is on the board) to a free pin. Can anyone assist in identifying where this is on the board?
I realise some of these questions may relate to the pinout used in this application but perhaps there is another Porsche PNP user out there that's done this before?
Many thanks.
#47
Ignition / Re: enabling camsync makes ign...
Last post by Machismo - June 22, 2023, 10:55:49 AMHere is the firing order, I mean it sure is strange, why on earth would Vems with cam-sync want to stop in the middle of the firing order list and have a break? It makes me think this is some software bug.
Here are the secondary trigger settings, let me know if something is not right
Here are the secondary trigger settings, let me know if something is not right
#48
Ignition / enabling camsync makes ignitio...
Last post by Machismo - June 22, 2023, 12:48:01 AMI had a single coil with a distributor which worked perfect and now I converted it to sequential ignition.
Meaning I have 8 coils which are controlled by eight +5V logic outputs. But to do that, the camsync needs to be enabled, for which I added a secondary hall trigger that is in a dummy distributor.
The engine is a even fire V8 so there is a steady flow of sparks to each cylinder. My primary trigger is 60-2 on the crankshaft which has worked very well. And when I take a trigger log when using a starter to rotate the engine it looks like this.
but with the camsync enabled, vems decides to first give spark to first four cylinders like it should, then it pauses for some unknown reason, and then (too late) it activates the ignition to the rest of the four cylinders. and then after that another pause. So basically the engine runs only 1/4 of the time. Why is this happening? As you see there are no green lines at all for a period of one crank rotation, so every second rotation there is no spark at all.
3.6 board
firmware 1.2.44
config 1.2.42
Meaning I have 8 coils which are controlled by eight +5V logic outputs. But to do that, the camsync needs to be enabled, for which I added a secondary hall trigger that is in a dummy distributor.
The engine is a even fire V8 so there is a steady flow of sparks to each cylinder. My primary trigger is 60-2 on the crankshaft which has worked very well. And when I take a trigger log when using a starter to rotate the engine it looks like this.
but with the camsync enabled, vems decides to first give spark to first four cylinders like it should, then it pauses for some unknown reason, and then (too late) it activates the ignition to the rest of the four cylinders. and then after that another pause. So basically the engine runs only 1/4 of the time. Why is this happening? As you see there are no green lines at all for a period of one crank rotation, so every second rotation there is no spark at all.
3.6 board
firmware 1.2.44
config 1.2.42
#49
Projects & Installs / Re: Porsche 928
Last post by Joc - November 03, 2022, 11:13:31 PMwhat is the use of the IF wire on the vems module
#50
Software / Re: WOT - shift cut time set t...
Last post by Morty - October 03, 2022, 05:41:20 PMI have the same issue on firmware 1.2.38. Which firmware version should I go for. A local VEMS dealer updated to this and said it was the one he recommended.