How can I get a higher psi setting on a waste gate that is set at 5.5 psi?

 

boost controller..

 

Thanks. Is that all I need to get to raise vavle opening pressure?

 

yup, the boost controller goes inbetween the source of vaccum and the wastegate. Basically the boost controller will change the signal (amount of boost/vacuum) that gets to the wastegate itself.

Jeff

 

Ok, you have pressure. You have a wastegate. The wastegate has a diaphram in it. The plunger in the wastegate is held down by a spring.

When the pressure on the BOTTOM side of the diaphram is higher than the rated level for the spring, the wastegate OPENS. If you connect the top port to vacuum, it will OPEN the wastegate when your motor is in VACUUM And it will keep it shut when the motor is in boost... this is surely not what you want. (Exhaust leak all the time until you hit boost and then boost is limited to say 25psi or the limits of your turbo!)

If you want to control boost, there are two ways to do it. You can equalize pressure on the other side of the diaphram (how the AVC-R works), or you can limit the seen pressure on the bottom side of the diaphram (how the TurboXS works).

For your setup, DO NOT CONNECT ANYTHING TO THE TOP PORT ON THE WASTEGATE. Leave it open to atmosphere! Of course the turbo "spools faster" when you have a pressure line hooked up to it because you will have boost limited ONLY by the flow/pressure capabilities of your turbo & motor setup. The wastegate will /NOT/ be regulating boost because there will be equal pressure on both sides of the wastegate diaphram.

Also, you DO NOT want to use the compressor as your pressure source. You lose pressure through the IC and piping, so the wastegate will open before you reach your desired boost. Use a pressure source from the manifold, I like the brake booster line before the check valve.

 

an internal wastegate only has 1 hole. thats for boost controller. but external has 2 holes.