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I know, this is somthing I'm going to have to tackle, making the modulator on my Cruisomatic C4 work, with the boost. I know that I have to put a check valve in the vac line, so it won't boost to the modulator, but also, the modulator would also have vac all the time, because of the check valve, how do I overcome this? I'v been told to create a slow leak in the vac line, and it would 'work' but I don't think that's a good idea, unless that's the only way to do it.
Stick an electric solenoid valve in the line, Then have a pressure sensor mounted on the manifold when it goes into boost it activates the vave and shuts of the line.
never thought of that
:LOL: Thats what geezers are here for :D :D
Here's what a typical mod set up looks like for a turbo auto. You can get the relief valve at most parts stores. The valve will let it suck but it won't let it blow.:LOL:
Jud
http://www.turbograndprix.com/VacModChk1.jpg
I Know for the c-6 they make an adjustable vac. modulator. check NAPA & see if they make 1 for the c-4. 31 5w