Weird NS boost problem
#1
Ozone Depleter
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Weird NS boost problem
hey every1,
So my boost used to be controlled by a home depot MBC, worked fine for a few months, then it stopped giving me 10psi...OK, so i threw that away and put in a Turbo XS MBC (the little blue one), tuned it and it held 10psi for a good year. Now this weekend im back at 10psi in the x-over pipe and 8psi at the UIM (typical 2psi pressure loss for the stock IC) and turning the adjustment screw does nothing. What could it be? The line from the y-pipe to the MBC to the wastegate actuator is good. The turbos have 30k miles on them, so i doubt it would be the actuator...but at the same time how could i "break" two MBC's in a year?
any help would be appreciated cuz im stumped.
-Zach
So my boost used to be controlled by a home depot MBC, worked fine for a few months, then it stopped giving me 10psi...OK, so i threw that away and put in a Turbo XS MBC (the little blue one), tuned it and it held 10psi for a good year. Now this weekend im back at 10psi in the x-over pipe and 8psi at the UIM (typical 2psi pressure loss for the stock IC) and turning the adjustment screw does nothing. What could it be? The line from the y-pipe to the MBC to the wastegate actuator is good. The turbos have 30k miles on them, so i doubt it would be the actuator...but at the same time how could i "break" two MBC's in a year?
any help would be appreciated cuz im stumped.
-Zach
#2
Tony Stewart Killer.
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zack you just answered your own question verifying that you dont have a leak
arent there nipples on the front turbo compressor housing? put one side of the vacuum line there and the other to the left nipple on the wastegate actuator and cap the right side.
if this doesnt work then id say you need to get another boost controller. Id suggest a profec it really is that nice.
arent there nipples on the front turbo compressor housing? put one side of the vacuum line there and the other to the left nipple on the wastegate actuator and cap the right side.
if this doesnt work then id say you need to get another boost controller. Id suggest a profec it really is that nice.
#3
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Originally posted by SurgeMonster
zack you just answered your own question verifying that you dont have a leak
arent there nipples on the front turbo compressor housing? put one side of the vacuum line there and the other to the left nipple on the wastegate actuator and cap the right side.
if this doesnt work then id say you need to get another boost controller. Id suggest a profec it really is that nice.
zack you just answered your own question verifying that you dont have a leak
arent there nipples on the front turbo compressor housing? put one side of the vacuum line there and the other to the left nipple on the wastegate actuator and cap the right side.
if this doesnt work then id say you need to get another boost controller. Id suggest a profec it really is that nice.
#4
Racecar - Formula 2000
Maybe the Bonez cat is collapsing, and that's why you can't get the boost you previously had?
#5
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Originally posted by DaveW
Maybe the Bonez cat is collapsing, and that's why you can't get the boost you previously had?
Maybe the Bonez cat is collapsing, and that's why you can't get the boost you previously had?
It's not a constant problem either...Its come and gone once and its back again after a year. It's specifically a problem with the WG Actuator and/or MBC, but i dunno which or the reasoning behind it.
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