Hello,

Tuning the $6E and using a aem 30-0300 wideband. Tunerpro's reading is off from what the gauge reads.

Does anyone mind looking at the conversion equation and seeing if it is correct?

Thanks.

 

Try this equation:

AFR = X * 0.046569 + 7.3125

The 7.3125 comes from the AEM doc. Then to convert the ADC counts to volts is 5V / 255 * ADC counts (X).

Then multiply by 2.375 (from the AEM doc):

(5 / 255) * 2.375 = 0.046569

RBob.

 

Thanks,

I changed the equation and synced the tunerpro log up to a video I took in the car and it is pretty close. I will test in car and see if I can visually see any difference.

 

On mine I spoofed the gauge output into the ECM using 4 AAA batteries (4.5V source) and a potentiometer such that I could set specific voltages and then see what tunerpro reports. That way I can do it in the driveway and verify the equation (safer and more accurate than trying to do it while driving glancing back and forth between the gauge and TP.)

 

That does sound like a good idea to be able to hold specific readings for comparison.

 

Oops.. I meant 3 AAA batteries not 4.

But yeah, I got the reporting accuracy in TP extremely accurate by doing that.

The most accurate method would be to spoof the actual sensor into the gauge and test the whole system.

but I figure I'm probably within the realm of reason to assume the gsuge is reporting accurately.

 

I played with this a bit. Try this out looks damn close to me.

 

Would this same formula work for the 30-4110 AEM Gauge?

 

Found the answer for the AEM 30-4110. Moates has the formula

A/F at 4.99 Volts is 19.98
A/F at 0.00 volts is 10.00

Span is 19.98 less 10.00 or 9.98

Span divided by ADC Counts (255)

9.98 / 255 = .0391372549

(X*.0391372549) + 10.00

 

If interested, Appendix B of the S_AUJP v7 documentation contains by part number the conversion equations for most all of the popular WBo2 controllers. In the MUST READ ME FIRST file attached here: https://www.thirdgen.org/forums/diy-...ml#post6437472