[94-turbo]

My 1994 gm 6.5 td with OBD1 computer uses an electronicly controlled vacuum operated waste gate to regulate boost.

I've read that opening the waste gate while cruising where the turbo is not needed can improve mpg! The turbo is actually a bottleneck causing back pressure and poor economy.

I built a turbo master that uses a spring to regulate boost pressure, and is manually adjustable. but that system closes the waste gate until exhaust pressure overtakes spring pressure, and creates back pressure during cruising, likely destroying fuel economy.

I reinstalled the original system and I am thinking of building an electronic circuit that can have a 3 way toggle switch for economy, power. And normal . For economy the switch opens the waste gate until needed, possibly with a throttle activated switch to resume ecm control above 1/2 throttle, and for power, an electronic manual control for boost like the turbo master had-non ecm control. I'd be using the vacuum - electronic solenoid but under my control for boost.

Anyone try opening the waste gate to increase economy?