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Old 11-11-2009, 11:39 AM   #1
Scooby Newbie
Member#: 106020
Join Date: Jan 2006
Default Calibrating wideband, changing WEGO GRAD CAL question...

As some of you know, I have been trying to get to the bottom of my poor fuel economy issues with my gt35r STi. Conservative driving yields less than 10mpg combined.

After a lot of detective work, I have become suspicious of my wideband sensor. The tune is great (by Scott Siegel), and after emailing Phil (who is a very nice, professional guy), he suggested that I check the calibration of my wideband sensor, so I followed the instructions.

Anyway, the second part of the wideband calibration process is to modify the WEGO GRAD CAL value to ensure that the sensor reads between 20.7-20.8 in free air. Mine read 19.6 prior to adjusting this value. Following the instructions, I adjusted this value to 230, which yielded the required reading of 20.7.

Now my question is this, is this a setting that is saved in the hydra itself or is it simply a software setting in the nemesis tuning program? Basically, I am curious if changing the wego grad cal value will solve my fuel economy problems.

Thoughts? I just re-read my post and I hope that I am making sense.

Thanks everyone!
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Old 11-11-2009, 12:13 PM   #2
Element Tuning
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Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
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The Zero Grad Cal and the Wego Grad Cal are part of your map. So if you load a new map you need to enter those calibrated values.

Hydra 2.5 and older is calibrated free air to 20.7

Hydra 2.6 is calibrated free air to 21.5

If your car was tuned with an incorrectly calibrated sensor or you were running "closed" loop fuel control with the wrong settings then yes your fuel economy would suffer.

My 08 WRX gets about 16 mpg mostly city driving and having fun. On the highway we were getting over 400 miles to the tank which worked out to about 29 mpg. For you to only be getting 10 mpg you are either driving in boost more than you think or your tune is WAAAAAAYYYYYY off.
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