Update WN.....
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Yeah, I have been so preoccupied with the cooling issues that I have not looked into it at all yet.Your turbo problems are interesting. We've got a few Aussies running the TD04HL-19T. Another installed one this week (still sorting out the tune) and reports 22psi.
I would be too if I had not done that appon assembly already. It seats flat and tight against the housing.I'd be checking how well the wastegate flap seals.
You are indeed correct. In all my reading in this turbo is was widely publicized that the conical was 5cm, the flat like mine was 6cm and the angled was 7cm. It appears that was incorrect and would indeed lead to the lazy response of this turbo. Would be good as the larger turbo in a small compound setup...... [emoji6]Your boost issue is just as if you are using a 7cm housing. I had a dig back through the thread and found a pick of your turbine housings page 14, post 279 the part # on the conical housing 89-11800 7 is a 7cm. I cant see the flat face housing part # (which from what I can make out is what you are using), but if is 6cm it should be 115 89-710 6. The 7cm is 115 89-810 7.
edit just found another pic post 606, page 31. looks like 115 89 11810 7 is the housing you have on and it is definitely 7cm.
Temp gauges reading wrong could be a bad earth.