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Old 09-16-2009, 10:15 PM   #1
turbo01gc8
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Default boost issues

is anyone familiar with a garrett T25 turbo? installed this kit 3 months ago with a pretty worn clutch and was making like 3psi and some cooler days was making like 4psi then it slipped badly. just replaced the clutch with a ceramic 4 puck disc and stock pressure plate. it seems like it will hold the power but i can't make over 2psi now??? i heard that there is a way to clock the compressor housing to adjust the internal wastegate but not sure if this is what i need to do. i also have a programmer that only controls 2 extra fuel injectors across the psi and rpm range. can anyone give me some advice??
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Old 09-17-2009, 12:10 AM   #2
legacydreamz
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check for boost leak or bad actuator. you really cant clock the compressor housing for much other than where you need the outlet to be.

pressure plates are what gives you the holding force, not so much the disk.
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Old 09-17-2009, 09:37 AM   #3
Odyknuck
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Make sure your turbine is spinning freely and you are getting plenty of oil to it. The actuator is usally factory set for 7 to 8 psi.
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Old 09-17-2009, 11:44 AM   #4
mlangejan
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sounds like a boost leak or there is something going on with your actuater get a air regulater and hook it up to the actuater and see when it is opening it should start to move around 6 psi if its opening with 1 or 2 psi thats your problem what type of ic are you running
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Old 09-17-2009, 08:35 PM   #5
turbo01gc8
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the intercooler is a pretty decent size. it came with the kit from Turbo Specialties and it's front mount. i just replaced the vacuum line from the compressor housing to the actuator with a rubber vacuum hose and small hose clamps and now it peaked at 4psi @ 5800rpm one time on the way home from work. it was feeling loose and it was that clear plastic junk with zip ties holding it on. the impeller spins freely and gets plenty of oil. about 80psi under load because i installed a pressure sender right at the feed line so i know at all times. i also fixed a slight exhaust leak at the manifold to the heads. still not happy with the boost i'm making how do i check the actuator?
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Old 09-19-2009, 12:00 AM   #6
turbo01gc8
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checked the wastegate actuator today and found it was holding pressure. guess the next step is to triple check for charge pipe leaks at every coupler, then to shortening to actuator rod b/c it's not adjustable
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Old 09-22-2009, 01:06 AM   #7
White 2.5rs
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how did you check it?
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Old 10-24-2009, 10:36 PM   #8
turbo01gc8
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with a vacuum guage and it pushed all the way open and held open. then i made the WG adjustment to almost a 1/2" shorter. now can make 7psi and peaked twice @9psi in 5th gear

Last edited by turbo01gc8; 10-24-2009 at 10:59 PM.
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