As I see it there are two ways to control a wastegate: changing the spring pressure, or manipulating the boost reference signal.
What are the pros and cons to using one or the other? I get that having a very low pressure spring and manipulating the boost reference signal would allow you to easily run little or boost at all, but say you never plan to run any less than 10 psi; does it still make sense to have a 5 psi spring?
Unless I'm mistaken, using a controller won't let you build less boost, or let you build boost any slower, as compared to the spring alone. You can use a two-port electronic controller to build boost more quickly since you can keep the WG valve fully closed until you reach spring pressure by running a signal line to the top port of the WG & running 100% DC until you reach spring pressure. From there up, you can either set DC to 0% to let it run at spring pressure, or set it to 100% let it continue to spool up as fast as possible past WG pressure with the WG valve fully closed, or you can set them somewhere in between to slow down the spool/limit how high boost goes.
But as far as I know, a WG controller can't soften up the hit below spring pressure.
If you're on a 10 lb spring & break traction at 7lbs, then using a controller & a 5lb spring could help you get to 10 lbs & possibly above, but with traction.
That's sound advice. Keep a spring at a low tension and use a regulator to control the boost. Done right, the fail safe would be low boost.
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