Uhm...
Just to be sure I got this right.

You have the boost reference hooked up to...somewhere before the throttle?
There is a hose from the intake manifold to the "other" side of the wg actuator, with no thingies in the line?

I would just disconnect the vacuum hose...and plug the hole in the manifold.
Then leave the extra port on the wg open.

I hope someone smarter than me comes to correct my mistakes

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I have no idea what I am talking about.

I went out and tested it tonight. The spring brings the boost in a little later, but does not limit the upper end. It still peaks at around 9 PSI, but starts a tad later. I think in order to limit boost, I might have to modify the wastegate itself to let more gas to flow.

Sam

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Boost control articles

part 1
http://www.autospeed.com/A_111348/cms/article.html

part 2
http://www.autospeed.com/A_111350/cms/article.html

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Thanks EMS. That was interesting. I bookmarked both articles for future reference. However, this approach assumed not enough boost, and not too much. This seems to be the standard concern of most articles about boost control.

I think I know enough now to trouble shoot the existing system. I will rig up a fitting to plumb my air compressor to the actuator, and see if it is doing its job, and to see if full motion is present. And, I will be able to monitor the air pressure required to get the actuator moving. Then I will move on from there.

Sam

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Sounds like a good idea to me!

I would still remove the vacuum line first, and see if that helps, as boost on both sides of the diaphragm would be...useless, kinda...

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I have no idea what I am talking about.

I will check that out. I am pretty sure there is a check valve in the vacuum line. Its purpose to help keep the wastegate closed.

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