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What could cause a 8-8-10 boost pattern?

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Old 03-21-04, 06:18 PM
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Question What could cause a 8-8-10 boost pattern?

What could cause a 8-8-10 boost pattern? Ever since I installed my PWR radiator, I don't get full boot on the primary anymore -- it also takes forever to build up 8psi. Could it be the couplers or something of that sort?
Old 03-21-04, 06:25 PM
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While installing could you have kinked or pulled a hose out?
Old 03-21-04, 06:31 PM
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Originally posted by Fatman0203
While installing could you have kinked or pulled a hose out?
I don't think so -- I didn't go near the vaccum lines.
Old 03-21-04, 06:34 PM
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Nor the ones near the acuators? Cause that would probably be the most likely ones.
Old 03-22-04, 12:51 AM
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Originally posted by Fatman0203
Nor the ones near the acuators? Cause that would probably be the most likely ones.
I don't think I did.
Old 03-22-04, 11:50 AM
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Check your two vacuum lines leading from the intake side of the primary turbo (just before the compressor housing). Those two can get jostled around when you're messing with the radiator and fan brackets.
Old 03-22-04, 12:38 PM
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Originally posted by Kento
Check your two vacuum lines leading from the intake side of the primary turbo (just before the compressor housing). Those two can get jostled around when you're messing with the radiator and fan brackets.
It leads from the primary turbo to which other line?
Old 03-22-04, 12:55 PM
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they go to the wastegate and turbo precontrol actuators. They are in close proximity to the left radiator hose so there could have been some contact with those vacuum lines.
Old 03-22-04, 06:52 PM
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Originally posted by 2a+RoN
they go to the wastegate and turbo precontrol actuators. They are in close proximity to the left radiator hose so there could have been some contact with those vacuum lines.
I readjusted my manual boost controller, and that didn't help much. Could it be my couplers? I was thinking that it couldn't be it because I still get full boost on the secondary.
Old 03-22-04, 07:34 PM
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Originally posted by WaLieN
I readjusted my manual boost controller, and that didn't help much. Could it be my couplers? I was thinking that it couldn't be it because I still get full boost on the secondary.
Check the boost at the Y-pipe and you will know for sure.
Old 03-22-04, 08:12 PM
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Originally posted by WaLieN
I readjusted my manual boost controller, and that didn't help much. Could it be my couplers? I was thinking that it couldn't be it because I still get full boost on the secondary.
Did you check those two vacuum lines that lead to the TPC actuator and wastegate? Make absolutely sure they're on tight and not cracked and hard from heat cycling.

No, it's not your couplers, because secondary boost would immediately cause a leak.
Old 03-22-04, 10:48 PM
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If it were me, I would check for a boost leak. If it is a small one, both turbos can overcome it to make 10psi, where as just the primary cannot. I've had this happen before, so it is a legitimate possibility. If you still have a stock y-pipe, I'd check that first and then the lower IC hose for cracks.

I'm gonna say probably not a vacuum line since it's only the primary turbo.
Old 03-23-04, 03:51 AM
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The weird thing is that my vaccum is still normal at idle 16-18in/hg(depending on the elevation). Would that mean that it's somwhere in my couplers/pipes?
Old 03-23-04, 07:11 AM
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Check the precontrol rod, the C clip might have fallen off the precontrol wastegate.
I had the same problem last week, slow build in primary full boost in secondary.
Old 03-24-04, 02:16 AM
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Originally posted by Jack
Check the precontrol rod, the C clip might have fallen off the precontrol wastegate.
I had the same problem last week, slow build in primary full boost in secondary.
Do you have a pic of that?
Old 03-24-04, 02:43 AM
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You'll be able to see it from under the car.
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