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The most obvious exception is the low rpm range. It's apparent that across most of the map the EU2 duration values are slightly higher. The EU3 durations are shown in red, and EU2 interpolation in light grey. Interpolating the EU2 durations for the 70mg IQ request column gives an indication of where EU3 duration would fall if the final column did not repeat the 50mg IQ request. The last two columns of EU2 map are repeated to approximate the EU3 final column. The following image shows the difference in cell values between the EU3 "0 degree" duration map and the EU2 "0 degree" duration, which has been interpolated to same IQ Request values. Difference between EU2 and EU3 duration mapsĭue to the differences in table breakpoints (axis values) it's a bit tricky to compare the EU2 and EU3 duration maps.īy interpolating the values from the EU2 duration maps to match those of the EU3 maps it's possible to get a sense of how different the Duration maps actually are. Again the idea is not to make broadscale tuning mods, but to allow the injectors to deliver the amount of fuel requested. In general terms the idea is that the upper column needs to be altered by extrapolating based on the increment and value increases present in the EU2 maps.
EU3 HOW TO GET CORE MODS
The EU3 mods I have in mind are currently untested and will require at very least a Wideband O2 sensor to verify "what you request is what you get". The EU3 motors present a far greater challenge as the duration maps are truncated to just above the expected operating maximum of approximately 50-55.00mg/stroke, so need to be modified to extend the range of usable IQs. Duration values are influenced by the behaviour of the combustion chamber, scavenging of exhaust gases and the fuel droplet size so seem to incorporate a degree of fitting to the engine design.įortunately with the EU2 motors the duration maps extend well past the normal operating range, so it's relatively straight forward to get away without adjusting the duration maps. I should note that the calibration maps are not an exact linear relationship of IQ request to duration. Altering the duration maps as a method of tuning destroys that relationship, in that a request for 35mg at 2500rpm might deliver 40.25mg by increasing the length of time the injector remains open.
EU3 HOW TO GET CORE DRIVER
The Driver Demand, Smoke Limiter and Torque Limiter IQ values are set on the basis that if the ECU requests 35mg of fuel at 2500rpm, the injectors are going to deliver 35mg. The idea that the duration maps are calibrated to deliver the correct amount of fuel for a specific Inject Quantity request is a fundamental idea to "new school" tuning. In effect the 3 or 4 individual maps create a 4 dimensional table with advance as the 4th dimension. The maps define duration at 0, 5, 10 and 25 (EU3 only) degree advance with the ECU interpolating values between the maps for intermediate values. The Duration maps are selected on the basis of overall Start of Injection timing.
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EU3 HOW TO GET CORE MANUAL
If a tuner modifies these maps there are no problems with "unknown" limiters restricting the requested IQ, and there is no need to account for map variations between Defender, D2 Manual or D2 Auto. The main reason this is done is because the injector open times looked from these maps are not modified - excepting for adjustments for injector performance codes - before being sent to the injector control code. Modifications to the inject duration maps are a key element of "old school" tuning.