ScuRoo Posted August 14, 2020 Report Share Posted August 14, 2020 A number of months ago I translated an Italian AG forum posted in 2006. For O2 equipped V11 owners I share what started as some interesting research and culminating in implementation which I’ll come to later... Let’s get into it! 👍😎 Google translated: motoube wrote: I'll tell you what I know and why in my opinion the probe used on the Guzzi can be thrown into the rock and replaced with a more modern one. the lambda probe, which some call the O2 sensor or lambda probe, is placed in the exhaust line. we are interested in the one positioned upstream of the catalyst. this probe generates an electrical signal (in our case between 0 and 1 volt nominal) whose value is related to the oxygen content in the exhaust gas this content varies with the variation of the more or less fat carburation. the control unit reads this signal and, taking into account many other factors (TPS position, air temperature, engine temperature ...) makes corrections using the maps it has loaded inside. it will increase injection times for fat and shorten for lean. in general, above a certain speed, the probe signal is ignored. the probe used by Guzzi corresponds to a BOSH probe which has certain characteristics corresponding to the BOSH specification "LSH15", in jargon called the LSh15 calibration curve this probe was used on cars starting from 1992/93, it was immediately seen that its sensitivity and response speed were INADEQUATE TO THE REAL CONDITIONS OF USE OF THE VEHICLE. BOSCH ran for cover and created the probe with the LSH24 calibration curve. much much faster and much much more sensitive. realize that the LSH15 probe has such a slow response time to the variation of the exhaust gases that the control unit takes a thousand or more readings of the lambda value .... the LSH24 instead has a very good sensitivity and a response time equivalent to the reading interval of the ECU. on the cars the lsh15 was replaced starting from 94 with the lsh24, ALSO ON THE CIRCULATING WHEEL, for example FIAT ordered the assistance network to replace the "office" probe on all the cars that for any reason showed up in the workshop but they did not make a nominal recall of the call. in this way, 95% of the current assets will be remedied within two years. it is for this reason that I recommend (and do) to replace the probe originally equipped with the most updated version. it costs something, but the bike is better, the catalyst benefits from it, consumes less, the bike is more fun, etc. among all the probes available on the market, I have indicated to you to ask the spare parts dealer for the PUNTO 55/60/75 probe from 98 with a single 4-wire connector. because'? because it has the same connector that we have, because it has the longest cable but it doesn't create problems because it is the version with the right calibration because that pointed model is the most widespread car of that period and therefore it is the car model for which the greatest number of spare parts are sold, which increases their availability and decreases their price. the same probe is in the universal version, without connector, it costs about 65 euros, you have to cut the wiring of your probe and weld the wires and seal wire by wire with heat shrink, you have to respect the correct wiring (ground, signal, two heater wires) , sometimes the color of the threads does not match. do what you like and let the guzzi do what she wants. I'm replacing the probe. Uberto End translation. It certainly pricked my interest so I went searching here @ V11lemans for more information - & found one lonesome piece of advice by SimoneV11 but it appears it may have been overlooked as no further discussion referenced it. Another excellent article source was found giving more helpful depth into what’s exactly required of the role O2 sensors play. If this interests you please take the time to read. http://www.autodiagnosticsandpublishing.com/feature/o2-sensor-testing.html So I’ll just add one more link for now about the O2 sensor upgrade (about 2/3’s down page). Ignore the heading ‘Breva’ as it pertains to our V11’s. http://www.guzzifan.com/moto-guzzi-tuning-codes-infos-tips/ Have to leave this for now but will get back with further report. 💤 1 1 Link to comment Share on other sites More sharing options...
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