NOS + Boost = Fun
Join Date: May 2003
Location: Ormeau, Gold Coast
IMO, water-air are better. A preperly set water-air cooler can be more efficiant than an air-air, as you can control the temp of the cooling fluid. With ari-air, you are depending on external temp to cool your charged air, and on a hot day, an air-air can actually increase air temp rather than decrease. With water-air, you can put ice in your header tank, or run an extra ice box to run the water over, and you can also set it up with an aircon type system to cool the air, so it is much more efficient than an air-air.
The other reason i like them is there is usually less plumbing. As an air-air needs air flow to work, it generally needs to mounted in the front of your car, so you have long pipes from turbo/blower to the cooler, with can atract heat soak, and slow air speeds due to bends, then the intercooler/interheater in front, and then more long bendy pipes, with more heat soak, and then finally into the TB.
With a water-air, you can put it directly between the blower/turbo, and the TB. Less bends, less heat soak, more direct travel for charged air.
But as i said, this is just my opinion.
70 GT Ford Capri
302 Windsor (347 someday)
Auto, Manual - Manual, Auto.
(I'll work it out one day)
Hilux Diff - 4.1 Detroit Locker