Gt2860rs
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(and perhaps its gtx equivalent) is probably the only gt28 sized turbo that is going to be worth considering over the ct20b.
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At safe pump fuel boost levels for that turbo size
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(eg.
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17 to 18psi) you would gain a minor increase in power and perhaps a few hundred rpm improvement in spool over your current turbo.
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It's what I'd consider a
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'no compromise' turbo in that it offers you the best of what a small turbo can offer.
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.
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.but as to whether the performance upgrade over the ct20b is worth the
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££££ it will cost is down to the individual.
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As for gt turbo reliability
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- I think that's certainly up for debate.
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I personally had a gt2860rs and a gt3071r fail in relatively short periods of time.
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Both
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times the reasons were suspected incorrect oil restrictor sizes.
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I think you'd be doing extremely well to get anywhere near 90k out of one of these turbos
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