Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDE11.06-IDLE CONTROLThis section of the ECU has been inaccurately described in the past and even in thecurrent release of EcuFLASH (v1.42 at time of writing) the definitions are inaccurate.Mrfred and gunzo have done the dis-assembly of the idle control sub-routines inthe ECU for ROM 88590015 (USDM9) and found it to be extremely convoluted andcomplicated. So we no longer have nice simple ISCV tables and idle rpm v temptables. Depending on the ROM version there are approximately twenty four definedparameters, including sixteen ISCV Demand tables.I will limit this topic to the parameters that are most likely to be adjusted from thestock settings.This is the idle speed target that the ECU will try to achieve, however there are fiveof these tables and no clear description on when they are used. The values at 77*Cand 82*C may require some adjustment when using high lift and high durationcams.Figure 75:IDLE CONTROL – TARGET MINIMUM IDLE v TEMP, EVO XREV: 0.K merlin@three.com.au Page 104 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDESECTION 12 – ECU OPTIONS12.01-ECU OPTIONS BIT PARAMETERSThere are six sets of sixteen bit data parameters, called the ECU OPTION SETS,which used to be named Periphery bits. These are mainly single bit controls toenable or disable functions/attributes/tests/fault codes. The data can be presentedin raw hex format, or as bits with some explanatory text if the function is known(and the xml file up-dated).Not all the bits have been defined, mrfred, jcsbanks, Mattjin, acamus andothers are continuing to work on identifying parameters as and when they can.The usual arrangement is a 0 will disable the function, a 1 will enable it. Some bitscontrol several functions at the one time. Some are used in conjunction withanother bit as an “or” function for the parameter.ECU OPTIONS SET #2 seems to be the most useful at the moment. I have editedmy definition files to better present the current data lists. OPTIONS bits can also beedited/changed entering a new hex value into the table.Figure 76: ECU OPTION SET #2If you are using a high-flow front pipe, you may be getting some rear O2 sensorfault indications on the CEL indicator. Attempting to disable this function via theECU OPTION SET #2 bit-01 will usually not give a satisfactory result. You need toalso do the DTC Disable items. There is also a simple mechanical fix, fit a 90 degreeelbow to the rear lambda sensor. This moves the sensor tip out of the direct gaspath and effectively simulates a front CAT.REV: 0.K merlin@three.com.au Page 105 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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