How stiff WG spring?

[Kiku]

Problem or question is that if i use 40mm turbosmart comgate instead of original. Then should i use 0.5bar or 1bar spring?
Car runs on rs2 turbo/em/dp/440 greens and custom map on ecu max 1.8 bar, nominal 1.6-1.7. Custom map is done with original wg but that ship is long gone because wg started to leak pressure quite bad.

I guess best is to map the ecu again?

[adam g]

Changing the WG spring now will mess up the engine map. The boost frequency valve won't know the spring has changed so you risk too much boost and engine damage.Decide on spring first then map it.

I had trouble stabilising boost with 0.5 bar spring. A 1 bar spring cured it.


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[Kiku]

I thought so, thanks !