Al, after giving some thought about the directions that came with the Mallory pressure regulator, it states that if you are not using a turbo or some other boos
t device, to just leave the vacuum port open on the regulator, which may be my best option, as don't think I have any need to leave it hooked up. No sudden acceleration of engine anticipated. I plan on doing the orifices for the EC2 though. JohnD
Yes, I agree. I started out with a unit that was not pressure referenced; for the same reason – NA. But it turned out that Tracy’s EC2 was setup with the assumption of MAP referenced pressure, and I had trouble getting it tuned. So I replaced the regulator. This was in the early days of the EC2; maybe that more recent versions will tune fine without MAP reference.
Al
I agree guys, unless you have a valid ram air scoop. Or any pressure changing device that is connected to your intake. A good ram air will produce elevated pressure and no MAP reference pressure regulator can make your mixture go lean.
Bill Jepson