RS Engineering metal expansion tanks?

[Italian_Tuneup]

Anyone used one of those? I cannot keep pressure in the system, new cap and tic-tac and it still will foam over when I shut the car off after a drive. System is fully burped, it's not getting hot, running a needle width over mid point but it will vomit coolant out from the threads of the cap. Thinking a metal tank with a proper american style metal radiator cap and not plastic might be the ticket? Note, I am running the E38 setup, so I don't have the built in over the intake style expansion tank.

[zukgod1]

Just spit balling here but, have you tried a new cap? Sent from my Pixel 4 XL using Tapatalk

[Italian_Tuneup]

Just spit balling here but, have you tried a new cap? Sent from my Pixel 4 XL using Tapatalk

Yeah, I replaced the brand new Uro one with a Brand new BMW one... BMW one is better, but still vents improperly. Bought the RS tank. Going to start with a Stant 20psi cap and go up from there

[WYZEUP]

Im using a metal expansion tank on my m60 - but i noticed the m60's have a higher pressure rating than the m20's. Ended up buying a 2.0 bar radiator cap from mishimoto and haven't had any problems

[Italian_Tuneup]

Im using a metal expansion tank on my m60 - but i noticed the m60's have a higher pressure rating than the m20's. Ended up buying a 2.0 bar radiator cap from mishimoto and haven't had any problems

Yeah, the M60's run crazy high pressure. THe old eta was 1.2 bar. I'm not at 2 with a 20 psi cap, barely above 1.2 bar but if it will actually hold pressure and not puke all over my coils I'll be happy for now. A 2 bar cap makes me worry I'll blow my heater core and scald the shit outta my leg.