I installed the Hallman Pro RX MBC on my 91 SS. With the soft spring I can run about 10psi...with the stiff spring...it only runs 10 psi as well...all the way cranked down.....
I am stock all around....what are results of others using similar MBC's?
I was thinking that maybe the exhaust is limiting the boost
Hallman Pro RX max boost?
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Hallman Pro RX max boost?
maciek puszynski
01 Impreza | v6 STi RA | 5mt | ej236t
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How have you hooked up the boost controller?
Josh
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surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
The bottom tube I spliced into the line coming off the intake manifold...the side tube to the wastegate....capped off the turbo nipple.....that's it
it definitely works....but can't go over 10psi
it definitely works....but can't go over 10psi
maciek puszynski
01 Impreza | v6 STi RA | 5mt | ej236t
93 Legacy Turbo | TW | 4eat | ej22t
16 WRX | 6mt | fa20
98 Legacy GT | wagon | 5mt | ej25d
2.36L Turbo - RSTi Build
01 Impreza | v6 STi RA | 5mt | ej236t
93 Legacy Turbo | TW | 4eat | ej22t
16 WRX | 6mt | fa20
98 Legacy GT | wagon | 5mt | ej25d
2.36L Turbo - RSTi Build
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Should work. I have a Hallman, I think the exact same model, and I was up at 12-13psi no prob.
As a separate issue: Don't plumb it off the intake manifold, plumb it from the compressor to the MBC to the wastegate. That way you won't overboost the turbo at part throttle. Doesn't answer your question, though.
As a separate issue: Don't plumb it off the intake manifold, plumb it from the compressor to the MBC to the wastegate. That way you won't overboost the turbo at part throttle. Doesn't answer your question, though.
'00 Impr RS - sold
'91 Legacy Turbo 5MT - mothballed
13psi, TurboXS TBE, WRX IC, Hallman MBC, TurboXS FCD, KYB AGX, Phil's STI seat, SPT short shifter, David Carter hood, Zeitronix widebandO2, Kuhmo rally tires, STI IC spray, thanks:gearboxtech.com
'91 Legacy Turbo 5MT - mothballed
13psi, TurboXS TBE, WRX IC, Hallman MBC, TurboXS FCD, KYB AGX, Phil's STI seat, SPT short shifter, David Carter hood, Zeitronix widebandO2, Kuhmo rally tires, STI IC spray, thanks:gearboxtech.com
You mean from the turbo to the MBC to the wastegate?
maciek puszynski
01 Impreza | v6 STi RA | 5mt | ej236t
93 Legacy Turbo | TW | 4eat | ej22t
16 WRX | 6mt | fa20
98 Legacy GT | wagon | 5mt | ej25d
2.36L Turbo - RSTi Build
01 Impreza | v6 STi RA | 5mt | ej236t
93 Legacy Turbo | TW | 4eat | ej22t
16 WRX | 6mt | fa20
98 Legacy GT | wagon | 5mt | ej25d
2.36L Turbo - RSTi Build
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yes, the nipple on the compressor side of the turbo
'00 Impr RS - sold
'91 Legacy Turbo 5MT - mothballed
13psi, TurboXS TBE, WRX IC, Hallman MBC, TurboXS FCD, KYB AGX, Phil's STI seat, SPT short shifter, David Carter hood, Zeitronix widebandO2, Kuhmo rally tires, STI IC spray, thanks:gearboxtech.com
'91 Legacy Turbo 5MT - mothballed
13psi, TurboXS TBE, WRX IC, Hallman MBC, TurboXS FCD, KYB AGX, Phil's STI seat, SPT short shifter, David Carter hood, Zeitronix widebandO2, Kuhmo rally tires, STI IC spray, thanks:gearboxtech.com
Not familar with the hallman, but if there is no bleed/vent of air you will not be able to increase boost (MBC's are just adjustable boost leaks).
If there are just 2 fitting on your MBC with no vent on its body then 1 of the fittings is the vent.
I have a cheap-o e-bay MBC in the LSS at the moment & I "T'd" 1 fitting into the line going to the wastgate, the other fitting was left disconnected (or connected to the coffee-mug) as it is the vent that allows you to raise boost.
If there are just 2 fitting on your MBC with no vent on its body then 1 of the fittings is the vent.
I have a cheap-o e-bay MBC in the LSS at the moment & I "T'd" 1 fitting into the line going to the wastgate, the other fitting was left disconnected (or connected to the coffee-mug) as it is the vent that allows you to raise boost.
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Nope. Disregard what BXSS said. He is correctly speaking about one type of MBC, but it's just that he doesn't understand how a ball-and-spring MBC works.
'00 Impr RS - sold
'91 Legacy Turbo 5MT - mothballed
13psi, TurboXS TBE, WRX IC, Hallman MBC, TurboXS FCD, KYB AGX, Phil's STI seat, SPT short shifter, David Carter hood, Zeitronix widebandO2, Kuhmo rally tires, STI IC spray, thanks:gearboxtech.com
'91 Legacy Turbo 5MT - mothballed
13psi, TurboXS TBE, WRX IC, Hallman MBC, TurboXS FCD, KYB AGX, Phil's STI seat, SPT short shifter, David Carter hood, Zeitronix widebandO2, Kuhmo rally tires, STI IC spray, thanks:gearboxtech.com