This wideband crap is pissing me off.

If I run my AEM UEGO analog wideband through the ECM into EVOSCAN using the calculation I can get it very close. But there is only a certain range I can get it to be accurate.

So say I dial it in at 15:1. It will then be accurate aprroimately from 14:1 - 16:1. Then either way out of that range it becomes inaccurate. Same as if I set it to be accurate at 17:1, then it is accurate from 16:1 to 18:1.

I now have it run through a Serial to USB, and cannot pick up any signal, although the COM port and adapter are working.

 

You need to redo the formula to make it accurate in evoscan. If you can get accurate data points (voltage, afr) at low medium and high afrs you can build a parabolic formula.

 

I feel your pain. I've been there as well as you can see in my earlier posts. It sounds like you need to experiment with Evoscan eval formula to get it right for your setup, like I did. Start off with my formula (7.95+(18.05-8.43)*x/215) and slowly adjust the "7.95" and the "215" until you get it right on. The "7.95" value place simply adjusts the whole scale up or down by the same amount. The "215" value place adjusts the function curve, which sounds like your problem. Try adjusting the "215" first and then bring everything into alignment with the "7.95" adjustment. It will take a bit of experimentation - trial & error. It may seem complicated at first, but after doing some adjustments and seeing the results, its becomes easy.

BTW, you can't log the analog face AEM guage with the serial to USB cable. The guage does not provide the right type of signal. You can only do that with the digital face AEM guage.

Good luck and try not to get frustated.

 

Thanks for the reply! Now I understand that there is more than one aspect to getting it dialed in.

I am not sure how to enter that formula you gave me. I can't even compare it to the 0.03913*x+9 I started with before.

Thanks!

 

The formula I started with looked like yours as well. Just enter my formula without the "()" on each end.

 

Aem Uego Analog (30-5130) is 0.5 Vdc at 8.5:1 AFR to 4.5Vdc at 18.0:1 AFR so...

(18.0-8.5)/255*x + 8.5 = 0.0372549*x +8.5

Log x at whichever MUT cell you are using and you should see linear value from 0-255 as your driving around, I tried using other formulas out there, but all were off in some way and most were for LC1.