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

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDEAnd another top installation pix with AMS parts from BigStevebowski onevoxforums.com.Figure 46:BOOST TUNING – SYNAPSE BOV on EVO X, on AMS intake pipeAnother very good BOV is the APS twin vent in plumb-back configuration. This is aconventional piston design, but made very well with good spring ratings for the EVOX.Figure 47:BOOST TUNING – APS TWIN VENT BOVREV: 0.K merlin@three.com.au Page 76 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDE9.02-BOOST CONTROL - AIRFLOW / BOOST LIMIT v RPMThe factory ECU tune has a set of parameters, called BOOST LIMIT, which isdirectly related to the calibrated output from the MAF. Once the ECU senses the airflow and thus the engine load, is at the BOOST LIMIT, as shown in the table below,it will cut fuel to protect the engine. This is referred to as the boost cut function,but is more accurately called Air Flow Cut. Once the MAF reads below the AIRFLOWLIMIT value, the ECU will inject fuel once again. If the values of AIRFLOW LIMIT areset at maximum, to eliminate the boost cut function, there is no over boostprotection, which is not good idea.Figure 48:BOOST TUNING – stock AIRFLOW BOOST LIMIT v RPM, RALLIARTFigure 49:BOOST TUNING – stock AIRFLOW BOOST LIMIT v RPM, EVO XNote how the values roughly follow the expected boost curve, offset some 30%higher, thus allowing for some variations in temperature and operating conditions,gear etc. When raising the boost level, this table will have to be raised or you willvery quickly hit boost cut.The BOOST CUT DELAY TIMER sets the time in milli-seconds after the BOOST LIMITis exceeded before fuel cut is instigated. Setting the BOOSTCUT DELAY to threeseconds will effectively allow for a mild over-boost spike without triggering boostcut. This can be quite a useful feature.Figure 50:BOOST TUNING – BOOSTCUT DELAY TIMERREV: 0.K merlin@three.com.au Page 77 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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