For 5 psi, I can see not using one. But why in the hell would you buy a $2500 turbo, plumb it and only run 5 psi? At 5 psi and no intercooler you might as well buy one of those ebay electric "turbos".
My first turbo car -a Sunbird- had no intercooler. It was a hoot to drive, but I wouldn't call it reliable. When was the last time you saw one?
If you ask Tlowe how hot the turbos charge pipe was on the 250 dyno engine,, he might change your mind.. It gets hot!
My bros 91 mercury turbo car boost pressure was 5 psi stock, it had an air to air intercooler factory.
His car was designed to use 87 octane fuel.
If the factory did not install one does not mean it would not have run better if it had an intercooler.
Intercoolers & plumbing cost money to install.
I think most all those turbos recommended in the Hot Rod article will boost way more than 5 psi & be more efficient over 5 PSi, those turbos have room to grow & boost more.
MBHD
