About two years ago I installed a dual dawes setup-first with a TPS switch and electronic control, then with a simple "high/low" manual switch. I ran 10 psi low and 17 psi high. Logic was to save on fuel with low boost when puttering around.
Watching fuel consumption over two years I have discovered there is virtually no fuel saving, EGTs are similar, and the GU certainly runs better on the higher boost.
Final outcome--I removed the low boost dawes and now run a single system.
BTW, anyone needing a dawes valve should PM me.
Reply With Quote