Dash AFR vs nGauge AFR

[ManBearPig]

I seem to recall seeing this mentioned in a thread some time back but I can't find it now.

I'm wondering how accurate the car's AFR gauge is? It does not agree with my nGauge. The nGauge always reads lower numerically (richer) than the car on both banks. I primarily look at lambda as I know it can be a more accurate picture but I'm curious if it's expected for these gauges to not agree, and why this may happen?

Thanks

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[EFI]

How are you calculating the lambda to AFR when using the ngauge?

OEM uses 14.08 as stoich and then applies lambda calculation to that.

Unless you are hardwiring a separate wideband sensor and reading off that to compare to stock, the ngauge just reads the same OBDII data as the OEM gauge so it should be the same. My guess is you're doing some funky calculation that is different than how the stock computer does it.

 

[ManBearPig]

How are you calculating the lambda to AFR when using the ngauge?

OEM uses 14.08 as stoich and then applies lambda calculation to that.

Unless you are hardwiring a separate wideband sensor and reading off that to compare to stock, the ngauge just reads the same OBDII data as the OEM gauge so it should be the same. My guess is you're doing some funky calculation that is different than how the stock computer does it.

No calculations...the nGauge has a readout for AFR for each bank. Both read different than the dash.

 

[ManBearPig]

Edit...found a post that explained the dash calculates stoich for e10 and the ngauge does not. That's probably what I'm seeing.

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