Thanks for your replies guys, mole sorry to hear it damaged your engine that sucks
I'm hoping as mine has forged rods and won't boost higher than 0.5 bar anyway it will be ok! I'm now doing what your doing, starting from the lowest spring. I think part of the problem I'm seeing is the distance the wastegate arm travels per pressure. For example my stock gate only opens about 5mm at 0.2 bar then maybe 1.2 cm at 0.5 bar whereas the new one opens nearly a cm at 0.2 bar and further still at 0.5 according to my pump. They both start to open now at the same pressure. This would suggest that the reason my boost is low is that the bcs is maybe pushing on the gate as it would normally but causing the arm to move more than expected so lessening boost.
No idea how to resolve that unless the ecu eventually learns it...
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