Hi Niel.  For the first few years I had a 1/8 hole drilled in a restrictor plate.  Later I tried it without any restriction except the distance of -4 hose and a remote oil shut-off valve that provides a little resistance.  As long as the return line is adequate, that seems to be the best solution for me.

The outlet of my intercooler does just what you describe.  I still think it is a good plan.  Fabricated my intercooler mounts from 1/4 inch chromoly tube to put it exactly where I wanted.  Same with oil cooler.

Dave Leonard

On Thu, Jul 23, 2020 at 3:04 PM 12348ung@gmail.com <flyrotary@lancaironline.net> wrote:

Gents

what size restriction did you put into the oil line feeding the turbo?  I assume it is just a small hole drilled into the feeder line?  Many interesting times trying to fit even half the junk under the cowl.  Just bought as second intercooler as the first similar to the stock RX7 intercooler had no hope, and am trying to get the outlet from the cooler to blow over the turbo and manifold, to cool same to some degree.  Interesting to say the least,

Neil.