I've built and had my forged ca mapped running 1.4bar low boost and 1.8bar high boost, took it on a trackday and noticed it pushing coolant out the expansion, not massive amounts.
I have pressure tested each cylinder and with 100+ psi in cylinder 4 the coolant level is rising slowly.
It is not mixing coolant and oil.
Anyone experienced this? I have a cometic 1.6mm headgasket fitted and arp head studs and head and block both skimmed to cometics recommended 40 ra finish.
The gasket was fitted dry with no sealer or copper spray.
I have since retorqued the head and this has reduced the pressure leak into the coolant.
I need to remove the head to inspect and also make sure the locating dowels are both inserted, has anyone ever installed a metal headgasket with a sealer if so what sealer?
I have also fitted an aftermarket pas reservoir fitted on the slam panel (tubbed arches) and this also is pushing fluid out, a fair amount too.
Originally I figured I overfilled it but once cool the level was well low.
I am going to try and modify the stock reservoir to fit but are there any other known reasons as to why I am pushing pas fluid out?