Originally posted by GSGoinFast

Originally posted by Ducking_Fumbass If you run them in parallel, the pressure loss would be the average of the three. If you run them in series, the pressure loss would be the total, added together. Try running them in parallel. It would be interesting to see how well this translates to the real world. Plumbing two (or three!) intercoolers in parallel would be difficult, though, especially with limited space under the hood.

trying to relate it to resistors and resistance?

It is uncanny how closely fluid dynamics can be related to electricity.

Each particle of air will only go through one of the intercoolers when they are plumbed in parallel, so to calculate the pressure drop, it would be something like pressure drop/CFM of flow for each intercooler, and totalled up.

For the cooling capacity, it would be (at least theoretically) very close to the sum total of all of the intercoolers, for slightly more obvious reasons. All of the air will be going through an intercooler
and the overall system capacity would increase.