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Recent posts
#51
Wiring & Sensors / Re: TPS 5V Dropping after 15-2...
Last post by jrussell - August 12, 2022, 05:59:20 PMHad some good discussion on this in the VEMS Users Group facebook group, but summarizing here for history/search purposes.
Pin 29 is a voltage divider. It shouldn't drop voltage unless there's a significant current draw on it. Is the TPS the only device on pin 29?
Does pin 28 (a 5v voltage regulator, not voltage divider) exhibit the same? Are there devices on pin28 now? If not, you could use that to see if the behavior follows.
I have seen where a bad (non-compliant) USB to serial cable pulled pin9 low on the db9 port... after 5-15 minutes. This is used for 5v power for the bluetooth devices and is standard in the rs232 spec. This is verified to not be the case in this instance, but just pointing out the possibility.
Pin 29 is a voltage divider. It shouldn't drop voltage unless there's a significant current draw on it. Is the TPS the only device on pin 29?
Does pin 28 (a 5v voltage regulator, not voltage divider) exhibit the same? Are there devices on pin28 now? If not, you could use that to see if the behavior follows.
I have seen where a bad (non-compliant) USB to serial cable pulled pin9 low on the db9 port... after 5-15 minutes. This is used for 5v power for the bluetooth devices and is standard in the rs232 spec. This is verified to not be the case in this instance, but just pointing out the possibility.
#52
Wiring & Sensors / TPS 5V Dropping after 15-20min...
Last post by Mikkson99 - August 11, 2022, 07:37:22 PMHi. I've got a m50 turbo, with VEMS v3.
I got a problem; After 15-20 minutes the TPS 5V supply will drop to around 2.6-2.7v and the ECU don't get the rigt readings.
Happens every time. Taught it may be the low voltage, when I didn't hav an alternator yet, but that did not help. Testet latest today, with 14.v on the system.
Measured same voltage both at TPS connector and EC36/29, so I guess the wire is fine. Also measured the wire end to end, 0.7ohm, and to ground - OL...
Also I was suspicious that the TPS itself where bad, as it was a "UAES" china copy thing. Got hold of an OEM BOSCH, but that didn't help neither.
Does anybody have a clue at what is happening/wrong?
Best Regards /Sondre Mikkelsen
I got a problem; After 15-20 minutes the TPS 5V supply will drop to around 2.6-2.7v and the ECU don't get the rigt readings.
Happens every time. Taught it may be the low voltage, when I didn't hav an alternator yet, but that did not help. Testet latest today, with 14.v on the system.
Measured same voltage both at TPS connector and EC36/29, so I guess the wire is fine. Also measured the wire end to end, 0.7ohm, and to ground - OL...
Also I was suspicious that the TPS itself where bad, as it was a "UAES" china copy thing. Got hold of an OEM BOSCH, but that didn't help neither.
Does anybody have a clue at what is happening/wrong?
Best Regards /Sondre Mikkelsen
#53
Ignition / Re: Using the Stepper Motor Dr...
Last post by s14nismo - July 26, 2022, 12:53:20 PMHi 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).
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).
#54
Configuration / AlphaN vs RPM(KPA) based ignit...
Last post by psychip - July 23, 2022, 09:35:05 PMHello guys, my setup is fiat coupe 2.0 16v wasted spark+dual injection. currently my VE table based on kpa (rpm) but ignition Y axis still reading from TPS.
my problem is engine extremely overheating, my primary suspect is ignition advance. so my question is, should i switch to kpa/rpm instead of tps or just reduce the values of ignition table?
the configuration file is attached
configuration
https://drive.google.com/file/d/1aOPPrmcOU87BVjODwF-cz701VegC07w1/view?usp=sharing
screenshot
https://drive.google.com/file/d/1MAmoB2Sv5XwmXVnrvyB79JX4ppZBjAgA/view?usp=sharing
my problem is engine extremely overheating, my primary suspect is ignition advance. so my question is, should i switch to kpa/rpm instead of tps or just reduce the values of ignition table?
the configuration file is attached
configuration
https://drive.google.com/file/d/1aOPPrmcOU87BVjODwF-cz701VegC07w1/view?usp=sharing
screenshot
https://drive.google.com/file/d/1MAmoB2Sv5XwmXVnrvyB79JX4ppZBjAgA/view?usp=sharing
#55
Software / VemsDisplay Android Bluetooth ...
Last post by M3GTttHulk - July 15, 2022, 05:46:08 PMHi guys,
Vems V3 running on firmware 1.2.43
Powered bluetooth adapter
Android tabled finds the bluetooth adapter, VemsDisplay connects (green connected) but it seems to be connected also when the car is switched off.
Switch the car on, power up the V3 but no data is beeing fed to the VemsDisplay
Any ideas?
Vems V3 running on firmware 1.2.43
Powered bluetooth adapter
Android tabled finds the bluetooth adapter, VemsDisplay connects (green connected) but it seems to be connected also when the car is switched off.
Switch the car on, power up the V3 but no data is beeing fed to the VemsDisplay
Any ideas?
#56
Ignition / Re: "Short" VAG coils don't wa...
Last post by ScareMercy - June 30, 2022, 09:09:46 AMI've tried a new Audi R8 coil yesterday to see if it makes a difference but that one also doesn't fire.
However, upon measuring the voltage on the signal wire during rest it reads 0,55V while it should be a ground. Is this voltage too high for the coil to reset itself?
However, upon measuring the voltage on the signal wire during rest it reads 0,55V while it should be a ground. Is this voltage too high for the coil to reset itself?
#57
Ignition / "Short" VAG coils don't want t...
Last post by ScareMercy - June 28, 2022, 12:13:09 PMHello,
I've tried getting my "Short" VAG COP's to fire since a couple of weeks, unfortunately without any luck. All 4 COP's are brand new, they're BERU ZSE030 coils.
So far I've tried the logic level outputs and stepper outputs, checked the pinout knowing it is differtent than the longer VAG COP's (Pin 1 and pin 2: ground on cylinder head, Pin 3: 12V,
Pin 4: Signal from VEMS). I've tried testing the configuration using a LED; the LED blinks briefly. I've also tried supplying 12V to the signal wire of the coil for a short moment; the coil fires on release.
So far so good, except that the coils won't fire in test mode or while cranking the engine.... I've tried contacting my VEMS supplier and have gone through the whole setup again, but still no spark.
Is there anyone that can point me in the right direction? I've been at it for 3 weeks now and am completely lost in what to do now.
I've tried getting my "Short" VAG COP's to fire since a couple of weeks, unfortunately without any luck. All 4 COP's are brand new, they're BERU ZSE030 coils.
So far I've tried the logic level outputs and stepper outputs, checked the pinout knowing it is differtent than the longer VAG COP's (Pin 1 and pin 2: ground on cylinder head, Pin 3: 12V,
Pin 4: Signal from VEMS). I've tried testing the configuration using a LED; the LED blinks briefly. I've also tried supplying 12V to the signal wire of the coil for a short moment; the coil fires on release.
So far so good, except that the coils won't fire in test mode or while cranking the engine.... I've tried contacting my VEMS supplier and have gone through the whole setup again, but still no spark.
Is there anyone that can point me in the right direction? I've been at it for 3 weeks now and am completely lost in what to do now.
#58
Configuration / Re: MAT /Intake Temp sensor M5...
Last post by woodbronks - June 11, 2022, 02:51:42 PMIt was the one that comes with the BMW M52 kit open air style "breu" i believe ,
Now since this post I noticed it was set to default and I changed it to a vems pre load and temps are spot on with ambiant and car seems to be running fine within the arf 14.6 just driving and under boost a little jumpy but in the 11.2-11.8 with 20psi (butaround 11.3 average)
I guess my question is should i be worried? i'm new to this and had a guy tune it for me
Now since this post I noticed it was set to default and I changed it to a vems pre load and temps are spot on with ambiant and car seems to be running fine within the arf 14.6 just driving and under boost a little jumpy but in the 11.2-11.8 with 20psi (butaround 11.3 average)
I guess my question is should i be worried? i'm new to this and had a guy tune it for me
#59
Configuration / Re: MAT /Intake Temp sensor M5...
Last post by jrussell - June 10, 2022, 05:24:46 PMWhich sensor do you have?
If the temps were off when it was tuned, fixing them now will require a re-tune. If they were accurate when it was tuned, fixing them to accurate now would be no problem.
If the temps were off when it was tuned, fixing them now will require a re-tune. If they were accurate when it was tuned, fixing them to accurate now would be no problem.
#60
Software / Re: PWM fuel pump control
Last post by jrussell - June 10, 2022, 05:21:28 PMQuote from: tonci on June 08, 2022, 08:05:11 PM
Is there any VEMS development still active?
Yes, for sure. But they aren't spending their time on here.