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

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDE9.05-BOOST CONTROL – REACTIVE SOLENOID WGDC vRPM/TPSThere are three maps to control the REACTIVE SOLENOID WGDC, two high gearand one low gear as per the BOOST TARGET ENGINE LOAD maps. Un-like earlierEvos, the EvoX and RALLIART have 3D maps to set the base WGDC. They allow theECU to quickly get the duty cycle close to the required value, then with the aid ofthe correction table, get the load to match the BOOST TARGET ENGINE LOAD map+ the BOOST OFFSET value.Shown below are the maps from a stock RALLIART and below it a GST tunedRALLIART using a boost pill to restrict the total air flow. See how with the stocksetup the BCS has to be driven to 100% WGDC to get some measure of control anda decent boost level. With the new pill in place, a much higher level of control ispossible at higher boost levels.Figure 54:BOOST TUNING – REACTIVE SOLENOID WGDC % v RPM – RALLIARTREV: 0.K merlin@three.com.au Page 80 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDE9.06-BOOST TUNING - BOOST ERROR CORRECTIONThe table is used to correct the boost control solenoid (BCS) pulse duty cycle to getthe actual load to match the desired load. Shown below are three variants, from leftto right: stock EvoX, stock RALLIART and GST tuned RALLIART. Note that the errorcorrection only operates on the “Reactive Solenoid Base WGDC Maps”. Both theRALLIART and the EvoX have the reactive tables, only the EvoX has the passivesolenoid.Figure 55:BOOST TUNING – BOOST ERROR CORRECTIONWhen the engine is idling or cruising, the BCS is at 0% WGDC. When the enginestarts boosting and the load exceeds the MIN LOAD for BOOST CONTROL point, theECU sets the BCS pulsing with a duty cycle from the BASE WGDC v RPM 3D map. Atthat point the ECU compares the actual load to the BOOST TARGET ENGINE LOADmap (plus the BOOST LOAD OFFSET) and makes an appropriate adjustment to theWGDC to the BCS.The rate at which the tracking check is made is set by the ERROR CORRECTIONINTERVAL timer. The stock value of 10 results in a correction interval of 1000mSbetween adjustments to the WGDC. This interval can be shortened to providebetter boost control, a value of 3 gives a correction interval of 300mS and is a goodsetting to use with three corrections per second. By shortening the interval, theECU will much more rapidly respond to load deviations from the target load value.Recommended minimum value is 3-4 for faster boost error tracking. Note thatwhen using a reduced correction interval you should also reduce the BOOST ERRORCORRECTION table values to prevent over correction as the system will now haveless lag and is effectively more sensitive.Figure 56:BOOST TUNING – ERROR CORRECTION INTERVALREV: 0.K merlin@three.com.au Page 81 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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