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Gt3071 Or Gt3076

Philr32

By Philr32,
in Engines & Forced Induction

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Philr32 Proficient

Philr32

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Morning gurus,

I bought a skyline 12 months ago and the owner said he changed the turbo, I can't remember whether he said it was a 3071 or 3076. How do I tell the difference? It's internally gated if that helps (although I believe either can be internally gated?). I thinks it says 0.67 a/r on the turbo itself.

Any help would be great. Cheers

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jjman Mentor

jjman

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there should be a little metal plate with numbers n letters stamped on the core (around where the hoses go in and out of the centre of it).

take a photo of that plate and either take that to a turbo specialist or maybe even someone on here can help you to sus it out based on that. n yes, you'll also need to get the A/R ratio numbers stamped on the housings.

Lithium Grand Master

Lithium

Posted
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Most "real" GT3076Rs have an anti-surge housing - if it sounds like a jet spooling, its a 56-trim GT3076R with the anti-surge housing. If it doesn't, doesn't mean it's not from the range of "GT3076R" titled things... but it's much more likely to be a GT3071R.

Philr32 Proficient

Philr32

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Most "real" GT3076Rs have an anti-surge housing - if it sounds like a jet spooling, its a 56-trim GT3076R with the anti-surge housing. If it doesn't, doesn't mean it's not from the range of "GT3076R" titled things... but it's much more likely to be a GT3071R.

Hmmm not sure, it does scream when spooling but it's my first turbo car so can't really compare.

Philr32 Proficient

Philr32

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An original Garrett GT3071R will have 0.50 AR on the compressor housing , the real GT3076Rs have 0.60 AR compressor housings .

A .

Must be a 3076 then because I definitely remember 0.6x a/r on the comp housing

Philr32 Proficient

Philr32

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So, say it was a 3076 what is a safe level of boost to run at constantly? I've been told all I need is a stiffer waste gate spring and I can run 21psi, would that be too much for the turbo to handle long term?

Philr32 Proficient

Philr32

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I don't see why not, how much boost are you on now? also maybe talk to a tuner before you go raising boost too much

It's tuned for 7, 10 and 14 PSI currently, I won't be changing any boost pressures with out a tune. Just wondering if a 3076 could handle 21PSI day in day out or if it would need to be turned up to 21 sparingly

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