What if?

[Chris Mallett]

I am sure I am not the first to think about this, and surely someone has done it. What if you were to use a stock style (or aftermarket for more pressure) spring diaphram waste gate actuator on the secondary, but put the hose on the primary, so once the primary creates 20-25psi, the wastegate opens completely, instead of drive pressure just forcing it open and possibly not opening enough to relieve drive pressure. My thoughts were that the enlarged wastegate would really be able to shine if it had a diaphram style to shove it open completely. These thoughts are on a setup like my 351/475 twins.

 

[Tate]

In my setup, I would be at 40-50 manifold pressure for the primary to come up to 20-25 psi. And its delayed more than the manifold pressure. Mine is setup that way. I didn't really see any benefit to it, I just haven't changed it back to the manifold pressure controlling the wastegate.