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Hi guys last week I upgraded my turbo and I had it tuned yesterday and they found that it is not holding boost.

Basically they set the boost to 17psi and it drops straight away down to 13.5. Then comes back up to 16 then back down and keeps on dropping down to 12psi. that’s with my boost controller but it also does the same without the controller.

Does anyone have any ideas?

The turbo is a trust TD05 18g

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Yeah, check actuator lines, also got a blow off valve? Might be leaking over 12PSI, dropping boost pressure...

Check clamps on FMIC piping you you have a cooler... Im guessing you do running that boost...

Edited by BookyVL

find out what psi rating the actuator is. if its like a 7psi spring and your trying to run 16psi through the boost controller has to work very hard to maintain the balance and it may not be able to keep up as well. what controller u using?

My mates actuator stuck on his td05 as the shaft angled slightly when the wategate flap was open and so jammed the shaft against the bracket.

You dont have any factory boost contollers or that sort of thing hooked up do you? And how is the actuator plumbed in? Can you remove the boost contoller from the loop completely as a test?

ive seen this before.

check or tighten the wastgate actuator.

with it of the wastgate flap you should have to pull it about 4mm or so to slide it over the flap leaver(what the rod pushes on)

also to stop that anoying boost dropping at hi revs hook the main feed directly to the plenum. not the outlet of the turbo.

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