Grubbster Posted October 18, 2009 Share Posted October 18, 2009 I know what it measures but does it actually do anything dynamically within the ECU? I have an Emerald fitted and the same question applies - I want to remove the std lambda and fit a wide band one connected to a gauge so I can make some adjustments in prep for MOT - but this means there won't be one connected to the ECU. As I am running 'open loop' I assume this doesn't matter? Solent Se7ens Web! Link to comment Share on other sites More sharing options...
henry21p Posted October 18, 2009 Share Posted October 18, 2009 At lower revs, it corrects the fuelling depending on the output of the engine. As I understand on the MEMS it can affect the fuelling up to 25%. At higher revs, the system operates in the other mode (I can never remember whether it is open or closed loop) and has no effect. With the Emerald, I have no idea. Link to comment Share on other sites More sharing options...
Mankee Posted October 18, 2009 Share Posted October 18, 2009 Can you not weld in another lambda boss for your wideband sensor and plug stick a bung in it if you decide that you don't need it after sorting out your MOT? Link to comment Share on other sites More sharing options...
Grubbster Posted October 18, 2009 Author Share Posted October 18, 2009 I could add a second boss (there is one in my normal exhaust but not in the MOT one!) but really just wanted to know whether it gets used int eh standard set up. I just removed it completely, fitted the wideband, connected to the gauge and set up one map in the Emerald ready for MOT - fingers crossed for next week. I'll talk to Dave Walker sometime about running in adaptive mode with a wideband sensor, it may be something to do before next year. Link to comment Share on other sites More sharing options...
rj Posted October 18, 2009 Share Posted October 18, 2009 It depends on whether your Emerald has been set up to running closed loop. With an R300 (K-series, MBE) I have seen up to 25% correction - at up to 3750RPM. To reach closed loop condition the RPM and throttle both needs to be steady. /r Edited for spelling bot not = both 😳 Edited by - RJ on 18 Oct 2009 19:57:58 Link to comment Share on other sites More sharing options...
anthonym Posted October 18, 2009 Share Posted October 18, 2009 which explains why I suspect my new one (the old one was shattered and fried) is making such a difference, it feels like someone is constantly adjusting the fuel mix a nano second after it needs it, whereas before I just experienced all sorts of muck. However, this is alpine driving and variations within that scenario, so nothing to do with mot. I do wonder how long it takes before it goes closed loop... perhaps I can look it up before RJ tells me :-) under 4,500? and about a minute? Anthony Link to comment Share on other sites More sharing options...
rj Posted October 18, 2009 Share Posted October 18, 2009 Anthony, I can't tell for the R500 engine, but for the R300 the lambda sensor is assumed warm after 45 secs. Speed tolerance for closed loop is 50RPM, water temp min 65deg. There seem not to be a time issue before it starts adjusting which is configurable, so I can't tell you how long it takes until it starts adjusting. Link to comment Share on other sites More sharing options...
anthonym Posted October 18, 2009 Share Posted October 18, 2009 what's "speed tolerance"? Anthony edit: I'll go read the book again 😳 Edited by - anthonym on 18 Oct 2009 21:06:34 Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted October 18, 2009 Share Posted October 18, 2009 50 rpm ?? Sounds like a large marine diesel !! Link to comment Share on other sites More sharing options...
rj Posted October 18, 2009 Share Posted October 18, 2009 the engine speed is considered steady if it's within 50 rpm ie 2950 to 3050 Link to comment Share on other sites More sharing options...
Mowerman Posted October 19, 2009 Share Posted October 19, 2009 Hi Steve If you take your car down to my 'usuall' place in Pompey for servicing MOT, he will use comon sense to get the car through emissions, Dans went through the other week.... Link to comment Share on other sites More sharing options...
Grubbster Posted October 19, 2009 Author Share Posted October 19, 2009 Cheers LK if you could email me the place that would be helpful in case I still struggle this time. We haven't seen you or BD around for ages! What's going on? Link to comment Share on other sites More sharing options...
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