Boost Creep Issue
#1
Boost Creep Issue
After installing my Megan o2 housing and 10.5 hotside onto my VIII turbo, the boost slowly keeps rising in WOT until I let off.
Here are my current and only mods right now:
STM Intake
AMS FMIC
AMS LICP
Hallman Pro MBC
3" Turbo back
Megan o2 housing
10.5 IX Hotside
EVO IX BOV
I was told I should not be boost creeping with the Hallman MBC. Any ideas? The hallman is installed correctly and I did not have this problem until after the o2 and hotside install.
Thanks
Here are my current and only mods right now:
STM Intake
AMS FMIC
AMS LICP
Hallman Pro MBC
3" Turbo back
Megan o2 housing
10.5 IX Hotside
EVO IX BOV
I was told I should not be boost creeping with the Hallman MBC. Any ideas? The hallman is installed correctly and I did not have this problem until after the o2 and hotside install.
Thanks
Last edited by badev0; Jan 30, 2010 at 11:06 AM.
#2
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Very common issue. Small turbo, why not let it creep? If you search "boost creep" on here you will find numerous similar threads.
I personally when using a stock framed turbo, port the WG flapper and eliminate the issue.
I personally when using a stock framed turbo, port the WG flapper and eliminate the issue.
#3
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has ur hotside been ported? if not, then get it ported and like partyboy mentioned, port the heck out of the wg slots.
to rule out whether the mbc is bad or not, just run ur actuator's sgnal directly off the jpipe/in mannifold pressure, this way u should only hit 11-14 psi depending on the actuators spring load. if u hold 11-14psi till redline, then the conculsion should be that ur mbc is bad.
gl!
to rule out whether the mbc is bad or not, just run ur actuator's sgnal directly off the jpipe/in mannifold pressure, this way u should only hit 11-14 psi depending on the actuators spring load. if u hold 11-14psi till redline, then the conculsion should be that ur mbc is bad.
gl!
#5
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iTrader: (102)
ya iam having the same issue with mine and did all of the following except for porting the hotside:
1) boost leak check
2) swapped vacume lines
3) swapped mbc's
4) swapped 3 stock oem actuators
5) swapped o2 housings (currently have an innvedia on)
and will do the following:
1) slap on a forge actuator
2) port the hotside.
1) boost leak check
2) swapped vacume lines
3) swapped mbc's
4) swapped 3 stock oem actuators
5) swapped o2 housings (currently have an innvedia on)
and will do the following:
1) slap on a forge actuator
2) port the hotside.
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#10
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iTrader: (102)
I had to take the actuator off the turbo to get this done, it was tough doing it while its on the car.
#14
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only negative is you may notice a slight increase in spoolup.
another way you can get rid of boost creep is to remove the o2 housing and get the wastegate passage as its a big cause of boost creep.
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