Dynodom Posted May 30, 2022 Report Share Posted May 30, 2022 Hi Vehicle: GTR R32 We are having to pass EURO2 emmisions test on this Vehicle. (Failed once already) For this purpouse, I am using the two factory narrowband O2 sensors for Cat precision, mapping very closely to Lambda-1, in closed Loop NB dither mode. The exhaust system is also equipped with two Link Can2Lamdda modules, not yet connected though. Is it possible on the Xtreme G4+ system, to use both, NB and WB sensors, by defining a switchover point, ie Map or TP or LA-target based, so that NB O2 sensors would be used in all areas where Lambda-1 is the target and all richer target areas would use WB ? TIA Quote Link to comment Share on other sites More sharing options...
Dynodom Posted May 31, 2022 Author Report Share Posted May 31, 2022 @Adam Linkecu Can you look into this? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted May 31, 2022 Report Share Posted May 31, 2022 3 minutes ago, Dynodom said: @Adam Linkecu Can you look into this? Thanks in advance. Don't forget the time difference... He's in NZ mate. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 1, 2022 Report Share Posted June 1, 2022 There is no way to switch between narrowband control and wideband. However, narrowband cant do anything a wideband cant. If you use the "Stoich Mode (wide band)" CLL mode then the CLL works like a traditional narrowband by dithering the fuel mixture 0.02 lambda either side of target. So if your target is lambda 1.00 it will work just like a traditional narrowband. Then say above 100kpa you can target a richer mixture. It will still dither either side of target but 0.02 lambda would not be a concern for most. This mode is typically a bit slower at high loads than the auto mode however. Quote Link to comment Share on other sites More sharing options...
Dynodom Posted June 1, 2022 Author Report Share Posted June 1, 2022 Thank you Adam. Quote Link to comment Share on other sites More sharing options...
Dynodom Posted June 2, 2022 Author Report Share Posted June 2, 2022 Hello Adam In response to your elaborate answer, I have one more question. <<However, narrowband cant do anything a wideband cant. If you use the "Stoich Mode (wide band)" CLL mode then the CLL>> I am aware of that. But, isn't a narrowband sensor more accurate, respectively faster responding at L1, compared to a linear wideband signal? D Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 2, 2022 Report Share Posted June 2, 2022 Not significantly as far as I have seen. The system doesnt even need to be particularly fast, most OEM CLL systems only oscillate at 5Hz or less. I think the main reason for narrowbands in older OEM's was cost - it was the cheapest way to achieve the objective. Most modern cars have changed to wideband sensor pre and post cat now as emissions output has gotten more stringent. A wideband has exactly the same narrowband nernst cell inside - it just has an oxygen pump cell working beside it at the same time, when you are at L=1 the oxygen pump is doing nothing. Quote Link to comment Share on other sites More sharing options...
Dynodom Posted June 3, 2022 Author Report Share Posted June 3, 2022 Thanks for the Insight Adam. Best regards D Quote Link to comment Share on other sites More sharing options...
Dynodom Posted June 4, 2022 Author Report Share Posted June 4, 2022 Hi Adam One more question came up. What is the function of the afr target table in Narrowband stoich mode? Is it still being looked at by the ECU in the Background? Load Input for Fuel is Alpha N, TP by the way. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 4, 2022 Report Share Posted June 4, 2022 In Fuel Main settings if "Open loop lambda table" is set to on, then the lambda target is taken into account as part of the fuel equation - much like a modelled/VE type strategy. Ie You can change the target lambda later after tuning and the mixture should follow without needing to retune the fuel table. The target table will always be used for CLL target regardless of this option being on or off in wideband stoich mode. Quote Link to comment Share on other sites More sharing options...
Dynodom Posted June 5, 2022 Author Report Share Posted June 5, 2022 Thank you Quote Link to comment Share on other sites More sharing options...
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