Author Topic: Noisy 5v on EC36/28 EC36/29  (Read 7342 times)

Offline Sprocket

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Noisy 5v on EC36/28 EC36/29
« on: January 07, 2017, 02:49:59 pm »
Topic for discussion.

In 2016 I experienced noisy 5v supply on Genboard V3.8 , usually when Vems bluetooth adapter is powered from EC36/28. I have not been alone.......

http://www.vemssupport.com/forum/index.php/topic,2500.0.html

http://www.vemssupport.com/forum/index.php/topic,2435.0.html

The bluetooth adapter appears to generate noise on MAP and TPS. In our application TPS DOT rate settings caused acceleration enrichments to be active ALL the time, while little added, it held off EGO and VemsTune and VemsDisplay gauges would flutter significantly...... No good. Adjusting TPS DOT rate settings caused hesitation. Removing the bluetooth adapter, Resolved the issue. External power supply of the Vems bluetooth adapter resolved the issue............ Vems bluetooth adapter creates noise on 5v supply when powered from EC36/28.

Today while looking at the schematics for another modification, I noticed that C69 (220n) capacitor  on 5v feeding EC36/29 is not present on the board. Pin 29 is powered from Pin 28 via R142 and ground through C69.

Forgetting for a moment my basic knowledge of electronics, would installing this capacitor help reduce the noise generated by the Vems bluetooth adapter on EC36/28?............

Offline Kamuto

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Re: Noisy 5v on EC36/28 EC36/29
« Reply #1 on: January 07, 2017, 05:07:17 pm »
Topic for discussion.

In 2016 I experienced noisy 5v supply on Genboard V3.8 , usually when Vems bluetooth adapter is powered from EC36/28. I have not been alone.......

http://www.vemssupport.com/forum/index.php/topic,2500.0.html

http://www.vemssupport.com/forum/index.php/topic,2435.0.html

The bluetooth adapter appears to generate noise on MAP and TPS. In our application TPS DOT rate settings caused acceleration enrichments to be active ALL the time, while little added, it held off EGO and VemsTune and VemsDisplay gauges would flutter significantly...... No good. Adjusting TPS DOT rate settings caused hesitation. Removing the bluetooth adapter, Resolved the issue. External power supply of the Vems bluetooth adapter resolved the issue............ Vems bluetooth adapter creates noise on 5v supply when powered from EC36/28.

Today while looking at the schematics for another modification, I noticed that C69 (220n) capacitor  on 5v feeding EC36/29 is not present on the board. Pin 29 is powered from Pin 28 via R142 and ground through C69.

Forgetting for a moment my basic knowledge of electronics, would installing this capacitor help reduce the noise generated by the Vems bluetooth adapter on EC36/28?............
just use other 5v source to power bluetooth :) or maybe power map from map supply as I understand you are using external map sensor? + your tps is wired from tps supply or 5v supply?
Vems installer in Lithuania
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Offline wersch

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Re: Noisy 5v on EC36/28 EC36/29
« Reply #2 on: January 07, 2017, 09:12:04 pm »
I noticed that you can´t order the BT adapter with the USB power supply anymore, i don´t want to power the bt adapter from the VEMS ECU because of the current draw and the noise (i have a few installations where the bt caused serious problems).
So what is vems solution on this now?
Would be great if they came up with a better supply for this!

Offline Sprocket

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Re: Noisy 5v on EC36/28 EC36/29
« Reply #3 on: January 11, 2017, 12:45:30 am »
Topic for discussion.

In 2016 I experienced noisy 5v supply on Genboard V3.8 , usually when Vems bluetooth adapter is powered from EC36/28. I have not been alone.......

http://www.vemssupport.com/forum/index.php/topic,2500.0.html

http://www.vemssupport.com/forum/index.php/topic,2435.0.html

The bluetooth adapter appears to generate noise on MAP and TPS. In our application TPS DOT rate settings caused acceleration enrichments to be active ALL the time, while little added, it held off EGO and VemsTune and VemsDisplay gauges would flutter significantly...... No good. Adjusting TPS DOT rate settings caused hesitation. Removing the bluetooth adapter, Resolved the issue. External power supply of the Vems bluetooth adapter resolved the issue............ Vems bluetooth adapter creates noise on 5v supply when powered from EC36/28.

Today while looking at the schematics for another modification, I noticed that C69 (220n) capacitor  on 5v feeding EC36/29 is not present on the board. Pin 29 is powered from Pin 28 via R142 and ground through C69.

Forgetting for a moment my basic knowledge of electronics, would installing this capacitor help reduce the noise generated by the Vems bluetooth adapter on EC36/28?............
just use other 5v source to power bluetooth :) or maybe power map from map supply as I understand you are using external map sensor? + your tps is wired from tps supply or 5v supply?

On my current box, I have DSUB9 on the back plate and factory wired with 5v on pin 9 for bluetooth making it a little difficult, but by no means impossible to power externaly without some sort of adapter. I've not experienced any noise on this box yet, but the bluetooth adapter will not power up after the ECU has been left off for a while. Powering on the ECU the bluetooth adapter doesn't even blink the LED. Unplug and re plug then away it goes. This isn't such a good thing as I had intended to leave the adapter connected to the box under the dash, for the Vems Disply.

To be honest, I've had loads of problems with the bluetooth adapter from Vems, on two different boxes and three different tablets, I've given up on it and just running with the Round AIM Gauge instead, it better suits the classic nature of the car  :)

External power is of course an option and that is how we ended up running it, but it adds extra bulk that can get a little messy at times.

Offline Kamuto

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Re: Noisy 5v on EC36/28 EC36/29
« Reply #4 on: January 11, 2017, 01:38:47 am »
usualy i use cheap ebay bluetooth adapters, havent had much problems with them :)
Vems installer in Lithuania
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Offline Denmark

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Re: Noisy 5v on EC36/28 EC36/29
« Reply #5 on: January 30, 2017, 06:20:51 pm »
I also have a car were the engine randomly dies when the Vems Bluetooth modul is pluged in

That is possible the same fault , it newer happens when BT modul is not connected

/Skassa
working on the boxer