Boost Creep with MBC???
The last poster beat me... I would replace the MBC with a straight coupler to test that the current lines will deliver a full and strong boost signal to the actuator with nothing else changed except removing the MBC from the setup. This should give you 12 PSI to redline or whatever our WG actuator is rated for. Possibly there is a leak in the hose where it bleeds the signal down at certain boost levels and the weak signal is allowing the WG to close again. If that still creeps then run a brand new line from the intake manifold to the WG actuator and ensure that there are no leaky lines and test again. If that creeps then likely you are just making good flow and power unless your WG actuator is not working properly... test with a pressure source outside the car to ensure it opens properly.
I've had really good luck with the Dejon Med-High dual boost controller. Spike is less than 1 PSI, good spool, and you can mount a switch inside that alternates between two boost settings on the fly. There's a decent spot right above the headlight dimmer switch area that has room to drill a hole out of sight and since that piece can be removed you aren't hacking your dash.
I've had really good luck with the Dejon Med-High dual boost controller. Spike is less than 1 PSI, good spool, and you can mount a switch inside that alternates between two boost settings on the fly. There's a decent spot right above the headlight dimmer switch area that has room to drill a hole out of sight and since that piece can be removed you aren't hacking your dash.
Originally Posted by Soon2BEVO
Well the thing is, before the MBC it wasnt creeping at all. It would just spike slightly then go to 19-20, then fall to 16 and HOLD to redline. As soon as I get the MBC on, theres been problems.
Its a very old Hallman MBC, like 4-5 years old, came off my 1G DSM. I used old vacuum lines not new ones, Im not sure if that matters. I didnt go buy a brand new new Hallman with new lines and such so I dont know if that could be causing the problem either. I might try shortening the line to the wastegate though! Thanks
Tom
Its a very old Hallman MBC, like 4-5 years old, came off my 1G DSM. I used old vacuum lines not new ones, Im not sure if that matters. I didnt go buy a brand new new Hallman with new lines and such so I dont know if that could be causing the problem either. I might try shortening the line to the wastegate though! Thanks
Tom
i believe that a stiffer spring would hold the ball closed more and would increase the restriction of boost signal into the waste gate thus increasing boost. if anything, he might need a softer spring.
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