06-26-2014, 06:00 PM | #23 | ||
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Drives: CTS
Join Date: Mar 2014
Location: Minneapolis
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Quote:
I would be exceptionally careful with that piece of advice. AFR are post. at full tilt, it will not take but less than 1 second to pop that motor. AFR gauges whether wideband or not will be a reactionary device (ie the lean condition has to happen before it is picked up). At 600hp, you go lean, you MIGHT get lucky to take your foot off the throttle intime to prvent something. I kindly label such devices "explosion detectors". Why? well, when an explosion happens, not only do you know but everyone else. It is definetly a post event sensor. with that said, The Bosch EMS are some of the most sophisticated EMS in the world. I am talking about 4 dimensional maps and probably more. The change of going lean due to turbo overspeed is for the most part nonexistent as the car is measuring the air in through the hot film air mass meter. In other words it knows exactly how much air is gulped by the engine at ANY given time (that includes load, TP % etc). Deleting exhaust restrictions will only move the VE% in a different "cell" with minor adjustments done through the closed loop cycle with the Wideband O2. at full boost.. 11.5 ( I prefer lambda as that is across the board and in 11.5 afr translated to around lambda .85) is as high as you will want to go. 12.5 is asking for trouble. Now if you are lucky enough to be able to handle e85... 10 (lambda = .7) is the magic number. Quote:
I know you mean well but this is easily searched. The engine has one Wideband sensor (The LSU ADV) which is pre-cat and one narrow band (also known as switching) LSF4.2 which is the monitor (in between the two ceramic substrates of the cat). http://aa-boschap-de.resource.bosch....magefolder.pdf page 7 for the LSU ADV, page 5 for LSF |
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