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I can remember being in my brothers car with a HKS2540 surging its head off, sounded like it was going to explode. He flogged it like that for a while and it gradually started smoking and he replaced with a hypergear. Was quite entertaining.

mass thread bump. anyhoo.

Scotty, what type of turbo wheel do we have in the s1 stag? They're ceramic aren't they?

Mine has been on 10psi for over 6 years, and has never been changed, and has maybe 0.5mm movement forward to backward. Being an auto it is always on boost.

I can only guess that good oil will have a big involvement in turbo life?

Of course, good oil is critical as there are multiple restrictors in the oil feed line. A small particle can block the feed easily.

The S1 uses a 33 turbo, known to let go fairly easily when the boost is upped. I ran my m35 ceramic turbo at 19-20 psi for 6 odd months on e85 without the sky falling, but perhaps they had redesigned the shaft/ceramic?

I would say it is more dependant on how many K's were wound off it in Japan before it was shipped over.

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