The irony is that it isn’t secret, new, and it’s already used on street cars, and despite F1 parading itself as being super advanced. Sour grapes, sure.Just_a_fan wrote: ↑Thu Sep 09, 2021 10:55 pmAnd might be why the FIA specify that the temperature must be (ambient + 10deg C) in order to limit / prevent it.Hoffman900 wrote: ↑Thu Sep 09, 2021 10:37 pmI would be surprised if they all aren’t doing that to some degree. It’s not exactly a secret or new.gruntguru wrote: ↑Thu Sep 09, 2021 10:27 pm
Pretty sure two phase cooling is not allowed.
Sub-cooling of the charge could be done using the Porsche method which is essentially a vapour compression technique - boost higher than you need - intercool to near ambient temp - expand to the desired boost pressure and enjoy the associated temperature reduction. Similar to air cycle refrigeration used in some aircraft - with the exception that the expansion is done in a turbine for even lower temperatures and some energy recovery.
This is also why it has to be taken as an average, and is not an instantaneous reading.
I believe Mercedes large plenum (inside geometry is ?) has given them more freedom to control this expansion phase. I bet the internal geometry doesn’t mirror the outside. NHRA Pro Stock guys do stuff like that to hide internal plenum designs, especially in the carburetor wet plenum days.