Yet another VNT control question

[aidan]

My Ranger has an ecu controlled IDI engine, EGR and wastegate turbo that has no electronic control.
I've been trying to think of ways to control a VNT properly.

Can you tell me if my theory is correct?

EGR operates at idle and at part throttle cruise?
EGR valve is vacuum operated?

I could use a standard wastegate actuator with a pressure feed from the compressor housing to the existing port, and connect vacuum from egr to the other side of the diaphragm (drill/tap, screw-in nipple of some kind?)

Also would it be fair to assume as there is no electronic boost control, the ecu matches fuel to mass air flow and will increase fuel automatically at lower revs to match the quicker spool?

[jtanguay]

EGR should only come on when the engine is cold.  if it comes on when the engine is hot it will cause stalling issues (basically chocking the engine)

i dont think it will work right that way.  best to stick with the mechanical linkage setup  :lol: the electronic control versions seem too complicated and expensive.

[aidan]

I was wrong now I read more about it, EGR is not active at idle, only at cruise. Which is fine, not a problem.
I can't find any article to back-up the only active when cold comment, no article mentions engine temperature apart from one that says its only on a warm engine.