Guest |229| Posted December 19, 2009 Report Share Posted December 19, 2009 Hi all. I'm setting up me individual cylender correction, but what is the best way to do it? RPMS Vs. MGP? RPMS Vs. TPS? Quote Link to comment Share on other sites More sharing options...
rayhall Posted December 20, 2009 Report Share Posted December 20, 2009 Use RPM Vs. MGP or RPM Vs. MAP Ray. Quote Link to comment Share on other sites More sharing options...
nissan200sx.dk Posted April 30, 2014 Report Share Posted April 30, 2014 Sorry for digging up an old thread, but this will keep the topic in one thread. If I make a correction to one cylinder will my overall AFR then change? Or will the ECU compensate? Also, can I just calculate the % difference in temperature and then add or reduce with that amount? The biggest difference I have in temp is ~50 degrees celcius. Any starting points for how much to add to correct for X temp? Quote Link to comment Share on other sites More sharing options...
Simon Posted April 30, 2014 Report Share Posted April 30, 2014 The AFR reading will change as it is the average across all cylinders (assuming only one wideband input) AFR corrections the ECU does, are to the main table so are a global correction across all cylinders. One thing to keep in mind is the ignition timing can also have a big impact on the exhaust temp as well. There is no calculation method that I know of to work out the correction required. Some of the tuners out there will likely have more info on this. Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted April 30, 2014 Report Share Posted April 30, 2014 Hi, Simon is correct, to have true individual fuel trim you must run 1 pyro/cylinder or 1 wideband sensor/cylinder. Otherwise you are purely tuning with data that is an average sum of all cylinders. You have no way of knowing if a single cylinder is running leaner or richer than any of the other cylinders. This is why when tuning I target a richer AFR as normally I use 1 wideband sensor 4 cyl and 6 cyl. Sometimes I tune with dual widebands on V8's and tune the AFR as an AVERAGE. I have attached a screen shot of a 2 stroke V6 Outboard I did with a V88, I used 1 pyro/ cylinder and dual wideband sensors. The screen shot is of the Individual cylinder fuel trim tables I created for each cylinder with EGT on the Y axis and RPM on the X axis. Regards Dave. Quote Link to comment Share on other sites More sharing options...
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