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PN77631 Datasheet(PDF) 9 Page - Mallory performance club

Part # PN77631
Description  MSD Boost Control Module
Download  12 Pages
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Manufacturer  MALLORY [Mallory performance club]
Direct Link  http://mallory-ignition.com/
Logo MALLORY - Mallory performance club

PN77631 Datasheet(HTML) 9 Page - Mallory performance club

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INSTALLATION INSTRUCTIONS
9
MSD •   W W W. M S D PE R F OR M A NC E . C OM   •   ( 91 5 )   8 55 - 7 12 3   •   F AX   ( 91 5 )   8 57 - 33 4 4
willnotmake27psiofboostpressure.Itwouldn’tbeuncommontosee18-20psiofboostpressure
inthatscenario.Thewaytodeterminehowmuchboosttheturbowillmakeinrelationtopressure
increasesonthewastegateisthroughtesting.Therearephysicallimitationsintheturbocharger
system,wastegatesizeandplacement,pressuredrop,andenginelimitationsthatwillaffecthow
muchboostpressuretheturbowillactuallymake.
BOOST CONTROL: SPOOL (FIGURE 9)
Figure 9 Boost Control: Boost Curve
Thenextsettingsfunctionasaspoolrev-limiterorretardwithoutwiringupthe5thstepretardwire
asaspoollimiter.
Spool Boost Target:Usedtosetthetargetspoolpressure.Therangeofadjustmentis2.9psito75psi.
Launch RPM above Target: SetsthelaunchRPMoncetheSpoolBoostTargetisreached.Thesetting
canbeadjustedfrom0RPMto12000RPM.
Note: ThissettingwillfunctiononlyifsetbelowthelaunchrevlimiterwithinthePN7730.
Spool Boost Retard: Aretardusedtohelpspooltheturboduringstaging.Adjustablefrom0-30*
TheBoostControlModulehastwodifferentmethodswhichaidinspoolingtheturbo.Thesemethods
workseamlesslywithouttheneedforadditionalwiringofthestepretardwirestoactivethespool
rev-limiterinthePowerGrid.
Note:Onlyonemethodforspoolboostrev-limiting/retardingwillworkatanygiventime.Thetwo
methodscannotbeusedtogetheratthesametime.
Method 1: LowerthelaunchRPM.StartbysettingtheSpoolBoostRetardto0.SettheSpoolBoost
TargettothedesiredMAPpressureatlaunch.SettheSpool/LaunchRPMtothedesiredlaunch
RPM.Thiswillworkasthelaunchlimiteroncetheboostpressureisatthedesiredlevel.Set
theLaunchRevLimiterinthePowerGrid7730Rev-limitertoahigherlimittoactastheSpool
Rev-Limiter.Forexample,ifthedesiredmanifoldpressurewas12psi,andthecartypically
launchedat4400RPM;TheLaunchRevLimitercouldbesetto4800RPMtoaidinturbospool.
TheSpool/LaunchRPMcouldbesetat4400RPM.Oncetheturbospooledandbuiltmore
than12psiofboost,theBoostControlModulewouldautomaticallyswitchfromthe4800RPM
rev-limittothe4400RPMrev-limit.
Method 2: SettheSpoolBoostRetardtothedesiredretardamount.SettheSpoolBoostTargetto
thedesiredMAPpressureatlaunch.SettheSpool/LaunchRPMtotheminimumRPMthat
theretardwillactivateat.
Note:OncetheSpoolBoostTargetisachieved,theSpool/LaunchRPM(Method1)orSpoolBoost
Retard(Method2)willclampdownlaunchvalue,evenifthepressuredropsbelowtheSpool
BoostTarget.Thisistopreventthelimiter/timingfrom“hunting.”


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