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Boost Issue

Jhols1

By Jhols1,
in General Maintenance

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Jhols1 Explorer

Jhols1

Posted
Posted

Long story short, exhaust manifold stud was stripped out, so pulled turbo and manifold off, install helicoil, re-install manifold and turbo. I also removed the cat.

It usually hits full boost at 4000rpm, but now it has no boost until like 6000rpm and even then it's only a couple pounds at most.

Car is 32 gtr rb26 t04z turbo.

As far as I can tell every bolt and hose clamp I undid I have done back up tight as it was.

Thinking computer issue or waste gate issue???

Turbo spins fine and freely as it should.

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https://www.sau.com.au/forums/topic/460866-boost-issue/
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statue Enthusiast

statue

Posted
Posted (edited)

Similar thing happened to me 2 weeks ago.

  • Boost suddenly slow. Full boost at 4500 rpm instead of 3600 rpm
  • Manifold stud went missing
  • Turbo spins fine
  • Hardly any shaft play
  • Compressor wheel looks fine

Mine however, made a noise. When the turbo was removed, the turbine wheel was checked - a fin was chipped and another is cracked

Hopefully its not the same issue.

Since yours isnt making a noise (is it?) and also a big jump from 4000 to 6000 then I'd also say its your gate being partially open.

Good luck

Edited by statue
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