I had my Hallman set @ 21.5 PSI for about a year untouched (no adjusting and used the screw on the fan as in the the pic to mount the controller)

Well, i put in my helix intercooler pipes and the boost dropped to 19, as expected. I tried to crank it up and no matter how much I turned up the controller, the boost stayed at 19. I turned the Hallman as low as it could go and tried all over and got it to set to 22. For about a week, it stayed at 22 then out of the blue at WOT it dropped from 22 to 19. after that, 19 all the time no matter if I cranked the knob. I unscrewed the hallman from the fan, shook it - and it went right back to 22. Lasted about a month, then yesterday I had to take a 3 hr drive to san antonio. 22 when in boost until right when I was 20 miles from finishing trip, it dropped and stayed at 19. again, unscrewed from fan, shook it and I am back to 22. how do I make this stop?

 

maybe dirty, take it apart and clean it......

 

agreed. Otherwise call Hallman, and ask em.

Or, check the lines to make sure they aren't pinching.

 

Friend had the same problem, that was the solution.

 

Should have Stoped there and fixed that prob 1st before cranking up the boost . Sound like a boost leak .

 

i have to ask, even though may be a dumb question, but did u buy the pro rx? if so, did u replace the light spring with the heavier spring? if not, the boost will only hold to 19-20psi or 22 like mine did at first and then steady at 19-20psi with the boost turned up and then replaced the ORIGINAL spring with the HEAVIER spring that comes with the pro rx. all the sudden.....28psi! then i adjusted it back down to 22psi for everyday driving and it holds great!

 

you just need the stronger spring in the rx

 

yeah id try the heavier spring

 

I never got a heavy spring. Do I need a heavy spring because I have been running 22 PSI for over a year without dropping. I think it maybe dirty because it sounds grity when I turn the knob. Anyone know how to take it apart?

 

Guy's , his mbc was working @21PSI UNTIL he put on pipes (AKA as I have a new boost leak b/c the hose are not on right/tight..) ! Or did i read the 1st post wrong

 

I don't think I have a boost leak because all I need to do is shake my MBC ( i don't even need to disconnect it) and I will have 22 PSI for a week or so. I would like to know how I clean out my MBC.

 

the internals are dirty. there is a ball in there that regulates the boost. it needs to be cleaned and oiled up

 

thanks, do you know how and what oil to use?

 

Ok , I didnt read the "shake-n-bake" part , Just sounds funny that you change parts and then you loose boost . I still think you should Know if there any leaks , not guess ..... Take the mbc apart use brake-clean and some WD40 and see if that helps any

 

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