Originally Posted by mberndt
I know it's for show, but it's SHOWING me that I have a rich mixture....
I understand why I would need a wideband with datalogging so I know where to make improvements, but why would I need a wideband to tell me the same thing that the other is telling me, that it's running rich?? I don;t wanna spend $200 for something that's gonna tell me the same thing, that it's running rich under boost...
It is showing you that you have a rich mixture but it doesn't tell you how rich it is, so how can you accurately tune it? you can install a AFC or even an EMS if you like. But if you add or subtract fuel for your WOT fuel values it will still read 10AFR.
An AF gauge hooked up to a narrowband (NB) sensor only tells you that you are rich, it doesn't tell you how rich you are. A NB setup is not calibrated to the same accuracy as a wideband setup. So that means your actual AFR could be off by as much +/- 1-3 points from what the gauge displays.
If you had a wideband hooked up it will display precisely what your actual AFR is. It wont just say "10" or "14.7" like your NB setup would. It will say 10.1, 10.2, 10.3, 11.5, 11.6, 13.0 15.1, 15.5, etc etc. A wideband with datalogging doesn't just tell you where to make the changes. It will tell you exactly how much to change it by.
If you insist on tuning your turbo setup with using a cheap AFR guage and the narrowband sensor you might want to start saving up for a new motor or a rebuild. Here is some more stuff for you to read
http://www.pgmfi.org/twiki/bin/view/Library/WideBandO2