Hallman MBC Problem
#1
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Hallman MBC Problem
Some quick background-
I installed my new Hallman Pro Kit (on the stock 16g turbo) and I am only seeing 16 PSI boost with the knob turned all the way.
Here is what I did to trouble shoot:
1) Boost leak test - none
2) Turned the knob on the controller all the way down, only to get 16 PSI (Yes I was turning it the correct way, clockwise) -- *EDIT*
3) Changed the vacuum hoses and made sure everything was zip tied
4) Switched the vacuum hoses around, when I did this I only saw wastegate pressure, 11 PSI
5) I plugged the vacuum line going from my MBC to my boost source and left my wastegate open to atmosphere and it boosted without issue.
6) On my Apexi AVC-R electronic boost controller, I was able to run well over 16 PSI - (22-23 PSI)....I just hated configuring the duty cycles, that's why I switched the Hallman
Is there another spring I am supposed to have with the kit? Do I only have the light spring?
I would like to run my boost at 25 PSI but cannot boost above 16 PSI.
FWIW, This is the spring I have with the kit now:
Any thoughts or suggestions would be much appreciated!
Thank you
-Bink
I installed my new Hallman Pro Kit (on the stock 16g turbo) and I am only seeing 16 PSI boost with the knob turned all the way.
Here is what I did to trouble shoot:
1) Boost leak test - none
2) Turned the knob on the controller all the way down, only to get 16 PSI (Yes I was turning it the correct way, clockwise) -- *EDIT*
3) Changed the vacuum hoses and made sure everything was zip tied
4) Switched the vacuum hoses around, when I did this I only saw wastegate pressure, 11 PSI
5) I plugged the vacuum line going from my MBC to my boost source and left my wastegate open to atmosphere and it boosted without issue.
6) On my Apexi AVC-R electronic boost controller, I was able to run well over 16 PSI - (22-23 PSI)....I just hated configuring the duty cycles, that's why I switched the Hallman
Is there another spring I am supposed to have with the kit? Do I only have the light spring?
I would like to run my boost at 25 PSI but cannot boost above 16 PSI.
FWIW, This is the spring I have with the kit now:
Any thoughts or suggestions would be much appreciated!
Thank you
-Bink
Last edited by binky; Apr 16, 2009 at 05:58 AM.
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What do you mean by, "the correct way", and, "all the way up"? FYI, to get max boost, you should crank it all the way in, or down, clockwise. Is this, in fact, what you did?
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It may very well be that your wastegate actuator is not preloaded at all and thus is set to open at base wastegate pressure(10-11 PSI).
Route a length of 4mm vacuum hose directly from your boost reference source(compressor outlet nipple, or intake manifold/DV "T") to the nipple on your WGA. Increase boost by rotating the turnbuckle on the end of the threaded actuator rod inward, which effectively shortens actuator rod length, thus increasing WG spring pressure. Preload the WG to between 14-17 PSI and then you can increase from that point on up to your target boost level with your MBC.
Route a length of 4mm vacuum hose directly from your boost reference source(compressor outlet nipple, or intake manifold/DV "T") to the nipple on your WGA. Increase boost by rotating the turnbuckle on the end of the threaded actuator rod inward, which effectively shortens actuator rod length, thus increasing WG spring pressure. Preload the WG to between 14-17 PSI and then you can increase from that point on up to your target boost level with your MBC.
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It may very well be that your wastegate actuator is not preloaded at all and thus is set to open at base wastegate pressure(10-11 PSI).
Route a length of 4mm vacuum hose directly from your boost reference source(compressor outlet nipple, or intake manifold/DV "T") to the nipple on your WGA. Increase boost by rotating the turnbuckle on the end of the threaded actuator rod inward, which effectively shortens actuator rod length, thus increasing WG spring pressure. Preload the WG to between 14-17 PSI and then you can increase from that point on up to your target boost level with your MBC.
Route a length of 4mm vacuum hose directly from your boost reference source(compressor outlet nipple, or intake manifold/DV "T") to the nipple on your WGA. Increase boost by rotating the turnbuckle on the end of the threaded actuator rod inward, which effectively shortens actuator rod length, thus increasing WG spring pressure. Preload the WG to between 14-17 PSI and then you can increase from that point on up to your target boost level with your MBC.
Thanks!
-Mike
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I used brand new vacuum lines from Autozone, they have no restrictions in them.
Yes, the boost will change from 11 PSI turned all the way up to 16 PSI turned all the way down.
-Bink
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Hallman makes two springs for their MBCs. They both come in the kit (that I got). Maybe yours was missing, or you got a lower priced kit that comes with only one spring. Either way, I'd check with Hallman and confirm which spring you have in your MBC, then get the heavier one if you have the light one only.
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Hallman makes two springs for their MBCs. They both come in the kit (that I got). Maybe yours was missing, or you got a lower priced kit that comes with only one spring. Either way, I'd check with Hallman and confirm which spring you have in your MBC, then get the heavier one if you have the light one only.
I hooked mine up to the WGA & Turbo nipple and had the same issue - I changed to the heavier (supplied) spring and had to turn it many times clockwise to get the boost up to 21/22 psi.
Best of luck!
Best of luck!
I spoke to Emery at Street Tuned Motorsports today and he wants me to send it back to him, so he can check it out.
Thanks Guys......If you have anymore ideas before I send it out let me know. I'll post back to let you know what ends up happening anyways....
-Bink