Boost Help...can't get it under control.

[bcn30141]

Hey Gents, my boost is shooting up to 30 psi very rapidly...I wanted to keep it around 25 or so. The Evolution wastegate has a 20 pound spring I think, at least it takes that much pressure to accuate the rod in the gate. It has a 0-25 psi T-netics boost controller. I has all new rubber vacuum lines and double checked the line arrangements. Any tips on what I'm missing? Thanks

[TexasT]

Sounds like the waste gate doesn't have the capacity to handle the volume it needs to vent to keep the boost where you want it.
Without knowing your combo it is hard to speculate. I see a gn1 downpipe in your Sig. Is it an internal waste gate version or are you relying on this EVO waste gate. You might need a larger gate with a bigger capacity.

[Forzfed]

How big is the wastegate and how do you have it hooked up?

[bcn30141]

It is a external tnetics evolution wastegate, I have a hose coming from the backside of the WG and turbo T'd together to the inlet of the BC, then a hose from the outlet of the BC to the front side of the WG. Only way I can keep the boost down is to peddle the throttle, not easy. Texas T you might have a good point about wastegate capacity, how is that figured?

[Forzfed]

I have a delta gate that everyone says sucks instead of blows.     Lowest boost I can get is 14psi but I can easily go up to 30psi.  And it stays at exactly where I put it at with no spiking.  You're hooking it up in boost sensing mode.  I basically set mine up so I have a low pressure side on the wastegate and a high pressure side.  I don't connect to the boost sensing port on the turbo.  I have a high pressure side and low pressure side connected to my controller.  I don't vent one side of the controller.  Working with differential pressure cells I thought this method would work much better and it definitely does.  I have no spiking and bang on boost control.

[bcn30141]

I have a delta gate that everyone says sucks instead of blows.     Lowest boost I can get is 14psi but I can easily go up to 30psi.  And it stays at exactly where I put it at with no spiking.  You're hooking it up in boost sensing mode.  I basically set mine up so I have a low pressure side on the wastegate and a high pressure side.  I don't connect to the boost sensing port on the turbo.  I have a high pressure side and low pressure side connected to my controller.  I don't vent one side of the controller.  Working with differential pressure cells I thought this method would work much better and it definitely does. 

Diagram picture on paper by chance, I'm not sure I follow, my fault as I am new to this stuff. Thanks

[Forzfed]

I'm on nights, so I'll get back to you in a day or two with a diagram.

[TWIN86GNS]

I'm with Forzfed, I like the Delta gates!!!    A lot of people don't like them, but I do, that is why I have them on both of my cars.