Stuhagen Posted September 13, 2012 Report Share Posted September 13, 2012 This topic might have been previously discussed, but I couldn't find answers. Is it common to have the Vipec read about .5 AFR higher than the Display gauge? I have a Innovate, Bosch type sensor. It read fine when I had another management system. Is there a "fix" for this? Is it a grounding issue? I would really like to know the true AFRs. Whether it is on my 52mm gauge, or the Vipec. Plus I do not really know which one is correct. The Vipec or the gauge. I suspect the gauge is accurate and the Vipec is reading higher. Stu Quote Link to comment Share on other sites More sharing options...
Simon Posted September 13, 2012 Report Share Posted September 13, 2012 Its likely to be a slight difference in ground levels for the two units. You can correct for this through doing a custom CAL and tweaking the voltages until the ECU matches the gauge. Quote Link to comment Share on other sites More sharing options...
Stuhagen Posted September 13, 2012 Author Report Share Posted September 13, 2012 Would I assume then that the gauge is accurate? And where in the Vipec would I find where to calibrate? Stu Quote Link to comment Share on other sites More sharing options...
bsh Posted September 13, 2012 Report Share Posted September 13, 2012 You should ground the Innovate to the same point as the ecu ground to avoid ground offsets (Vi-Pec pin 25 & 34) Also check in LM programmer that the output you are using are setup correctly according to the info provided from Innovate. Something like 0V - 7.36 AFR and 5V - 22 AFR. I have seen a couple of these come with some strange values from factory... For a test, program the Innovate to show a flat 2.5V and check with a voltmeter connected between Innovate output and ecu/Innovate ground that the Innovate actually output 2.5V. When verified, program back to default setting. When wired and setup correctly, the gauge and Vi-PEC should read pretty close. If still not correct, do as Simon says and instead of chosing default LC-1 calibration under Wideband in your analog input where you have your Innovate wired, choose a free cal table. example cal 4 if it is not in use and assign it. Then setup as air/fuel and start with 0V - 7.36 AFR and 5V - 22 AFR. Then you can tweak these values until the Vi-PEC shows the same as your gauge. Little hard to explain another language... Quote Link to comment Share on other sites More sharing options...
Simon Posted September 13, 2012 Report Share Posted September 13, 2012 That was explained very well Ben! Quote Link to comment Share on other sites More sharing options...
Stuhagen Posted September 13, 2012 Author Report Share Posted September 13, 2012 I understand. Right now, it is set at Innovate LC1. I can change to Calc 4. If I go into Calc 4, it is already set up for 0v-5v, 7.35-22.0 AFR. So If I change this from LC1 to Calc 4, I then can maybe change the 5.0v to like 4.5v? And see if this fixes it? Or would I change the 22.0 to 21.5. Not sure exactly which value I should change. Since this seems to be a much easier fix, I will try this first. I am pretty sure my LC1 is chassis grounded and not ECU grounded. Although I can run a ground wire off the LC1 ground wire over the the ECU ground easily as well. Quote Link to comment Share on other sites More sharing options...
bsh Posted September 14, 2012 Report Share Posted September 14, 2012 Just move the LC-1 ground to the Vi-PEC ecu ground and see if it is reading correctly then. Usually when LC-1 and Vi-PEC are grounded to the same place, they read very close. Quote Link to comment Share on other sites More sharing options...
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