Voltage Change-Dataq to Calcon

[vyal]

I finnaly got my dataq to connect up to my calcon. What is awful strange is the voltage difference the two show. At 20:1 my LC-1 is set to 2.00volts, at this reading, Dataq reads 1.966volts. At the same time, my voltage reading coming out of calcon is 1.914volts. I am using the standard innovate DBF thats 10:1 at 1v and 20:1 at 2v. Reading 19.14:1 when it should be almost a full point higher is frustrating. Whats the best way to go about correcting this? Through the LC-1, dataq or calcon?

 

[Stanger007]

Hey dude, I missed this post.

I had this same problem with my setup. Even though everything was grounded at the same location, I had a bit of a voltage drop by the time the wideband signal got to the twEECer causing CalCon to think my car was running really rich.

Here's how I fixed it.

1. Set your wideband to output 2v for both the high and low values. This is done in LMProgrammer
2. In DataQ's WinDaq, read in the signal - it will most likely be less than 2v. Find the difference (2v-1.85v = 0.15v)
3. Set the LMProgrammer to output 1v for the high and low values.
4. Back in DataQ's WinDaq, again find the difference. It will be close if not the same as the difference you computed earlier (1v-.84v = 0.16v)
5. Back in LMProgrammer, enter the high and low values as what your twEECer is expecting + the difference you computed. (2+.15=2.15 and 1+.16=1.16)
6. Fire up CalCon using the Innovate file (it's based on a 1-2v range)

What you are doing is boosting the voltage by the exact value it is dropping so that when the signal gets to the DataQ, you are seeing the expected voltage.

Mustangless is working on the same thing, perhaps he can chime in as well with how it's working out for him.

Hope this helps.

Wes