Quote:
Originally Posted by beatr911
That is a good plan for the O2 sensor. If no changes are made to the engine systems you're mixture is probably pretty good. Jetting changes made with plug checks is a guess at best with todays fuels. Feedback is the only way to do it with any sort of accuracy. The GS500F carbs have 3 distinct circuits and the O2 feedback will let you know how each is operating, something a plug check is very very difficult to do. Because the narrow band sensors and gauges are so inexpensive it's really worth it to use this method for a benefit for years to come.
I question the use of a vacuum gauge, as the CV carbs doesn't let port vacuum drop so far as to be a problem. The good point though is it gives some feedback on engine load, which may be your goal.
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Thanks for the feedback on vacuom guage and constant Velocity carb's. I was forced to think more clearly about how they are different from other carb's. the throatle plate opens and closes like other carbs but the vacuom controled slide opens the throate of the carb at a controled rate that is slower than the plate thus the change in manifold pressure is slower/less than what would be encountered with a throatle plate alone. This would result in an atenuation of the vacuom signal. i guess they call them constant velocity carbs for a reason!
With respect to a O2 sensor I would plan to install it in the exhaust cross over tube between the 2 headers close to the heads or further down the exhaust system where the two tubs join before the muffler. What are the pros and cons for that type of O2 sensor? Could you recomend a source, Part number or brand name? Do they come as a kit with a digital read out? My only experiance with O2 sensors is testing them with a scan tool and replacing defective ones, and basic theory of operation. Designing them into a system was not part of my training. This will be a good learning experiance.
