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Old 01-29-2006, 07:45 PM   #1
fragment
Scooby Specialist
 
Member#: 8050
Join Date: Jul 2001
Chapter/Region: W. Canada
Location: Bugeye EJ207 - T3T04S - RIP
Vehicle:
2004 FXTi - Stage 2
Goooooooolld

Default Disagreement between Hydra WBO2 and LM-1

In the process of fine tuning my Hydra fuel map, I thought I'd install my LM-1 in the exhaust behind the Hydra WBO2. I recalibrated both in free air before checking them against each other. The LM-1 calibration is automatic, and I set the WEGO grad cal to 166 to get a 20.8 AFR in free air.

I was very surprised at how far apart the two were in operation. At steady cruise my Hydra shows 14.5 (where I set it so I don't think the sensor is creeping) but my LM-1 shows 13.7. I'm running my Hydra in open loop fueling mode right now. I tuned the map with autotune and smoothed, and was pretty happy with the results, but when I eliminated the cat, I was getting a stronger fuel smell then I expected; hence the comparison.

My WEGO zero cal is at 126 and the grad cal is at 166. Does this indicate the zero cal is off? Or maybe a bad sensor?
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