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New turbo, not enough boost

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Old Sep 16th, 2019, 13:32   #1
zac123
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Question New turbo, not enough boost

Howdy Volvo lovers,

fitted a new turbo to my V50 this weekend. the bearing had failed on the old one and was making a hell of a noise.

stupidly i did not adjust the actuator arm on the new turbo to match the old turbo when i installed it and now i'm finding the new turbo doesn't boost up quite as much as the old one.
can anyone tell me which why i should twist it to increase boost.

clockwise or anti clockwise?

here is a picture of the old turbo in the correct orientation.
thanks
zac
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Last edited by zac123; Sep 16th, 2019 at 14:27.
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Old Sep 16th, 2019, 13:49   #2
rob99
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Howdy Volvo lovers,

fitted a new turbo to my V50 this weekend. the bearing had failed on the old one and was making a hell of a noise.

stupidly i did not adjust the actuator arm on the new turbo to match the old turbo when i installed it and now i'm finding the new turbo doesn't boost up quite as much as the old one.
can anyone tell me which why i should twist it to increase boost.

clockwise or anti clockwise.

here is a picture of the old turbo in the correct orientation.
thanks
zac
That core doesnt look new.

If you changed the core then the actuator arm should not of been moved only un-clipped from arm.

What may of happened is vnt tirbos work with the vacuum pulling the arm to the grub screw stop in your picture you must change this if the actuator arm length has not changed.

The grub screw stop is the start of where the vnt mechanism starts from if its not starting from the correct position then the cheese wedges of the vny will not be directing exhaust gasses onto your turbine correctly.
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Old Sep 16th, 2019, 13:52   #3
rob99
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Sorry thats your old turbo.

The stop screw must be set to the same length as the old one try and set it up best you can with the threads you can see from your old pic.

If you have unscrewed the actuator arm the again you need to set it up as best you can from your picture.

Or i would send the turbo off to get it setup properly.
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Old Sep 16th, 2019, 14:54   #4
Clan
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Originally Posted by zac123 View Post
Howdy Volvo lovers,

fitted a new turbo to my V50 this weekend. the bearing had failed on the old one and was making a hell of a noise.

stupidly i did not adjust the actuator arm on the new turbo to match the old turbo when i installed it and now i'm finding the new turbo doesn't boost up quite as much as the old one.
can anyone tell me which why i should twist it to increase boost.

clockwise or anti clockwise?

here is a picture of the old turbo in the correct orientation.
thanks
zac
The question which comes to mind is what did you do to ensure this turbo won't fail any time soon? Turbochargers generally do not wear out , 90% of failures are down to the oil supply . did you fit a new oil feed pipe and make sure large quantities of oil pumped out when you cranked the engine? Just wondered ..
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Old Sep 16th, 2019, 16:32   #5
zac123
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The question which comes to mind is what did you do to ensure this turbo won't fail any time soon? Turbochargers generally do not wear out , 90% of failures are down to the oil supply . did you fit a new oil feed pipe and make sure large quantities of oil pumped out when you cranked the engine? Just wondered ..
yes new feed pipe and banjo and properly primed with oil before cranking the engine for the oil pump to do its job.
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Old Sep 23rd, 2019, 13:30   #6
zac123
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to finish this tread off in case anyone else has the same question..

i adjusted the grub screw stop upwards by approx 3mm. I then released the locking nut on the actuator arm and wound the thumb turn section clockwise down until it met with the locking nut.
i made these adjustments based on information i gathered online. please do your own research first in case these adjustments are suitable for your setup.

the turbo now boosts the same as it did before and i'm happy its operating as it should.
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