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

MERLINS RALLIART & EVOLUTION-X TUNING GUIDE9.03-BOOST CONTROL - BOOST TARGET LOAD v RPMThe ECU has three maps, called BOOST TARGET ENGINE LOAD, (#1A High GearRange, #1B High Gear Range and #2 Low Gear Range) which with the addition ofthe BOOST CONTROL LOAD OFFSET parameter, sets the target boost level. So, foran ADM RALLIART, as shown in the tuning example below, with 98 in the DESIREDBOOST ENGINE LOAD table and an offset of 80 from the BOOST OFFSET data, givesa desired peak boost load level of 178. Or, roughly 15-17psi boost level.Figure 51:BOOST TUNING – BOOST CONTROL LOAD OFFSET, stock & tunedIn the GST tuned ROM for the same car, the BOOST CONTROL OFFSET has beenbumped to 125 and the BOOST TARGET ENGINE LOAD map has been raised tovalues of 118 through the peak torque rpm band. This should give a desired peakboost load level of 243, or roughly 21psi.Figure 52:BOOST TUNING – TARGET LOAD, RALLIART, stock & tuned by GSTNote that the precise usage of map #1B is not currently known, set it the same as#1A. The switching between maps 1 and 2 is controlled by RPM/MPH CROSSOVER.The table below will provide a rough guide (for a stock turbo) as to what the boostlevel is for a given load. The actual pressure will vary with gearing/temp/altitudeand the rate of load change.Table 3ROUGH GUIDE TO LOAD v BOOST LEVELLOAD 120 140 160 180 200 220 240 260 280 300BOOST 4.5 7.5 11 15 17 19 21 23 25RANGE 7.5 11.0 15 17 19 21 23 25REV: 0.K merlin@three.com.au Page 78 of 134