bryancmatthews

So the issue I am having is the different reading from my AEM WB EUGO gauge and the AFR readings on the Datalogit. I read to forum here about how to get it up and which settings to use and nothing seems to work. On my watches i see a ton of super low values such as in the 9's and On Map watch (im tuning vacuum AFRs) it shows an avg of anywhere between an avg of 10-12 usually. Therefore ive been decreasing the amount of fuel. Now my gauge is reading values of 15-17 and sometimes 18 while my Datalogit is still reading rich. What could be the issue?
Please Help!

RotaryEvolution

iTrader: (30)

looks like your scaling is off. try to find the manufacturers volts versus AFR chart and plug in some plots based off those readings. 0v=9AFR is not a usual wideband reading... perhaps 1v=9AFR sounds a little more reasonable, as well as 5v=25-27AFR.

that is just a guess based off of memory and not a hard fact plot.

edit: i just read on the AEM install instructions that your plot appears to be close to accurate however it doesn't sound like it based off other widebands i have used, however i hate AEM widebands, so there is that too.

there should be a programming disc with the AEM to program the gauge, perhaps that is the one that is not reading correctly. does the car smell excessively rich or does it hunt for an idle?

bryancmatthews

Yes, it has a richer smell and it also has a bouncing idle after it is warmed up such as at red lights etc

DriftDreamzSS

iTrader: (4)

I thought I heard that the AEM's had a non linear output and didnt integrate well with other devices.

bryancmatthews

If that's the case, which 52mm gauge who you recommend that works best with the pic?

C. Ludwig

iTrader: (27)

0.00 = 10.00, 4.99 = 19.98 The output is linear.

I've never had an AEM output exactly match the display. It will usually be off a couple tenths and you'll need to fudge the values in the Datalogit to get it to match.

RotaryEvolution

iTrader: (30)

according to the OP though his is off by about 6-7 full AFR points, so something else is missing from this equation.

C. Ludwig

iTrader: (27)

Yep. And the place to start is with the proper calibration and knowledge that the output is linear. If, at that point, he still has problems, we can address those issues.

My guess is he has the serial output connected to the Datalogit and not the analog output.

Markus1981

Its either that or maybe his grounding . In his settings he has got Delta AN1 / AN2 activated . Would be interesting where his AN2 is grounded (ideally should use the same ground as the wideband uses) .

bryancmatthews

Ludwig, could you elaborate more on the serial vs analog output connection to the datalogit?? The way I have it set up is the 0-5v white wire connected to AN1 and I spliced the ground and have it running to AN2 which is the way the manual says to do it.