Thread: VF570 installed
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      12-18-2012, 07:09 AM   #110
pokeybritches
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Drives: ESS/G-Power Z4M, VF Z4, 996tt
Join Date: Sep 2009
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2006 BMW Z4M  [10.00]
2006 BMW Z4M  [8.50]
2003 BMW Z4 3.0i  [9.00]
Quote:
Originally Posted by aerobod View Post
I believe that under WOT conditions the car should be running open loop and there should be no feedback from the O2 sensor (unless a non-OEM wideband sensor is being used).
I think the precat O2 sensors are wideband, and that open-loop operation at WOT is a thing of the past for BMW's. I was under the impression that newer BMW's ran closed-loop all the time.

Quote:
Originally Posted by BMW Maniac
This is a MAF based system, correct, and not a MAP based?
I think the VF420 kit is MAF-based, and the 480/570 are MAF-less tunes.

Edit: I'm not where I heard this, and I'm reading different information on VF's website.
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