Quote:
Originally Posted by unreal-
I've been having problems with my 3871. For the past few weeks ive been tracking down a overboosting issue. Ive replaced all visible vac lines, FPR has its own vac line from manifold, BOV and boost gauge share a source. Hallman MBC is installed, but it overboosts whether it is installed or not.
Boost leak check revealed no leaks except at the turbo itself. Sounds like its coming from the CHRA area. Rest of the motor is air tight (FMIC couplers, injector o rings and insulators, TB and IM gaskets, EGR blockoff gasket, BOV flange)
My setup:
3871 with garrett 7# actuator
ISIS FMIC
ISIS V1 manifold+dp+elbow
Five-o 580cc inecjtors
Enthalpy tune
Z32 MAF
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any reason your not using the ISIS adjustable wastegate actuator?
because the factory ISIS WGA holds about 12-14psi... and you should not be able to overboost without a MBC hooked up..
If it is still overboosting means ur wastegate isnt opening, disconnect the actuator and see if you can swing the flapper.