I will test this on the way home from work tomorrow and see if I can do a proper datalog. Ho hum live and learn eh?Īnd Fred has just confirmed my dumbass status, thanks Fred I unwittingly used the configurator which apparently does nothing in MS2. So as Fred said earlier it sounds like it has not been configured properly in software by the dopey bloody owner, (me).Īnd just as I write this I think I have found that I have not setup the AFR table for my wideband controller using the tools, calibrate AFR tables. it also behaves exactly the same on the stim.
The EgoVGauge indicates the correct voltage as measured at the ADC pin of the MS2 for some reason the AFR value is subjected to some manipulation and the displayed values on the AFR Gauge and the AFR bar behaves as a NB signal. When you actually look at it the critical part is the probe the controller is just a glorified op amp well its actually a DSP and Microcontroller in the case of the one I have.Īs I posted earlier the sensor and controller are doing what they should its when the signal gets into the megatune software where things go tit's up. Trying to estimate what your engine will specifically need beforehand can be more confusing than productive.OK I understand that there may well be some manufacturers of wideband controllers out there that are considered the mutts fuzzy bits. In general, this is all much easier to understand when you are working on a running engine. Also see the code specific tuning parameter's guide for the code you are running, such as those for 2.905 or 3.770 Not doing so can cause damage to your engine. The most fundamental parameters are in the 12×12 volumetric efficiency (VE) table(s), the 12×12 air/fuel ratio (AFR) table(s), and the 12×12 spark advance table.īe sure to read all of this document, and the configuration document BEFORE starting to tune your engine. These include things like cold start pulse widths and acceleration enrichments. Tuning involves setting all the parameters that the MegaSquirt-II™ (or MicroSquirt®) controller uses to be optimal for your non-pollution controlled engine, injection components, and driving style. If you are not familiar with tuning EFI systems, you might want to review the material in the Principles of Tuning page before reading this document. Tuning Your MegaSquirt-II™ (or MicroSquirt®) Controller Setting the Cold Start and Warm-Up Enrichments.Manifold Absolute Pressure (MAP) Sensor.How an Internal Combustion Spark-Ignition Engine Works.Then your MegaSquirt-II controller will adjust the amount of fuel injected based on the AFR table until the wide band controller reports a voltage corresponding to the air/fuel ratio in the appropriate cell of the AFR table. If you have a wide band oxygen sensor & controller, choose 'Single Wide band' under Settings/EGO Control in TunerStudioMS, and be SURE to go to Tools/Calibrate AFR Table and select your controller type. What are the advantages & disadvantages? The AFR table is not used, instead a single VOLTOXTarget is used.Tuning Your MegaSquirt-II™ (or MicroSquirt®) Click on our menu buttons immediately below to find MegaSquirt® information quickly:
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