E85 0-5v Input VEMS anytrim

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E85 0-5v Input VEMS anytrim

Postby scottme262 » Mon Aug 14, 2017 9:38 pm

Hello Guys, I have searched for this and cannot find it.
I have a 1993 Audi S4 running the VEMS ecu. I have a Zeitronics flex fuel unit that gives a 0-5v signal for the ethanol content.
I just hooked it to the input for Anytrim Fuel trim on MCP3208Ch1 and am getting 1/2 the voltage showing in the scaling as the VEMS unit is receiving. Right now the ethanol content is 50% so it should be reading 2.5v in the software. It is getting 2.5v on its input (I just checked).

Is there a trim setting that I am not seeing that is halving the value the VEMS unit is using?
The firmware is 1.2.29 and the config is 1.2.23

Any help to get this to read the correct voltage would be appreciated.
Thank you
Scott
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Re: E85 0-5v Input VEMS anytrim

Postby scottme262 » Tue Aug 15, 2017 10:12 pm

The problem has been solved by the EFI Express guys.
Pin2 on the econosel connector had backed out of the connector.
Plugged in and all good.
The Zeitronics unit is communicating perfectly and the anytrim now works as designed.
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Re: E85 0-5v Input VEMS anytrim

Postby ChrisAudi80 » Sat Aug 19, 2017 11:49 pm

Could you give some more information on what you use? Is it the complete ECA-2 kit or just the sensor?
Also, which EC pin did you put the signal to?
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Re: E85 0-5v Input VEMS anytrim

Postby mushasho » Sat Sep 09, 2017 2:33 pm

ChrisAudi80 wrote:Could you give some more information on what you use? Is it the complete ECA-2 kit or just the sensor?
Also, which EC pin did you put the signal to?



Would need to be the complete kit... I bought the sensor and just input crude frequency into VEMS... works as well, less gear.
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Re: E85 0-5v Input VEMS anytrim

Postby scottme262 » Tue Sep 12, 2017 7:44 pm

It was the complete kit from Zeitronics. I wanted the display, but yeah you can get the frequency output and use the wheel speed method that I don't know how to do :)
I have the display mounted in the ashtray so I can fill up and get the blend I want. Usually drive around the block and go back to top off with either fuel to get it where I want it. I'm OCD that way.
But that is a habit hold over from when I was running E85 blended down to E50 and using my Motronic ECU, by messing with fuel pressures to get it trimmed out. Worked ok, but you needed to be E47-E52 for it to not throw a code.

Now with the VEMS The output from the Zeitronics is 0-5 and it went to pin 2 channel 1 on the EC10 connector.
Marc had already put the scaling in the anytrim 1 for fuel and anytrim 2 for timing based on the ethanol content when I purchased the VEMS unit.
It is working great. Now on to Launch control!
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Re: E85 0-5v Input VEMS anytrim

Postby 88a5tq » Thu Aug 30, 2018 4:22 pm

LC took me like 2 years to figure out lol. This looks pretty cool and sure enough I'll need anytrim control using a flexfuel sensor after I rebuild the 3b. So your channel it's feeding, is it pulled-up and protected, just pulled-up, or something else I'm clueless abouy? Lol
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Re: E85 0-5v Input VEMS anytrim

Postby scottme262 » Fri Aug 31, 2018 11:15 am

I know its working, but I don’t know if the pull up, pull down etc.
I just contacted Marc and he reminded me that that channel was setup and ready for me.

I am not near my car and diagrams for a few weeks, if you wish I can look into it when I’m around it and let you know the settings
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Re: E85 0-5v Input VEMS anytrim

Postby 88a5tq » Fri Aug 31, 2018 12:11 pm

Yes that would be extremely helpful and I would be very grateful. Thanks!

also no rush as I'm currently and rebuild hell for the next 2 months lol
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