On my lq4 say I have a wastegate that has a spring of 5psi and I'm getting 8 psi max if I replace the vacuum line with a manual boost controller does that meen that the more you screw the **** in the more boost you will have because the boost reference has to fight through the spring and ball valve tension before it can open the gate? I'm new to turbocharging so just wondering if this is correct

 

Your spring puts pressure holding the gate closed. If you want it to make more boost you put more pressure on top the spring, to keep the gate closed at higher pressures. You can use a small valve but the problem is the pressure is continually rising as the boost rises. So if you are making 8psi, you are putting that 8psi on top the spring to make more, and it will keep rising. Best to use a mini air regulator like this.
http://www.grainger.com/Grainger/WIL...214?Pid=search
Because 8psi on top the gate will have more pressure (8psi x diaphragm diameter).
With a regulator you can fine tune it and keep it so it stays steady.

So a hose from pressure side of cold pipe to the regulator and to the top of the gate. You can mount he regulator inside the car also. The regulator in the link is also a panel mount one so you can mount in a console, dash, wherever..

 

gotcha , why do the diagrams show the top of the gate being vented and the manual controlling valve suppling boost pressure underneath the spring that is opposite of what you have explained to me il post a diagram link

 

http://www.perrinperformance.com/sha...ystemsmall.jpg

 

There are at least three different stratagies. It depends on the controller. Some are air bleeds that reduce the pressure to the diaphram. Some block boost to the wastegate (yours I think) until an internal spring valve is over come. Dual hose units apply boost to both sides of the diaphram and the controller limits the amount of boost to the top holding the valve closed.

Manual controllers vary depending on temperature. Scaling more than 50% gets pretty sketchy.

 

When you say scaling at more then 50% do you mean for example if you had a 5lb spring you wouldn't want more then 7.5 to 8lbs of boost?

 

The pressure/spring from the regulator would be holding the gate closed... so depending on which way you are holding it, which ever port holds the gate shut.

 

But if your turning to much boost you would have to change springs correct? If your gate has an 8lb spring and it pushes 11 pound with just a vacuum line and no controller once you put the controller on you cannot go any lower then 11 psi just more then 11psi? Correct

 

Right.

 

Thanks man now gotta figure out what gate to buy maybe a 44mm? It's an lq4 with a turbo cam and a gt45 that everyone says is to small lol

 

Yes if you are looking for any consistency.

My LS2 GT45 is quite happy at 7psi. Are you wanting more?

 

like to be in the neighborhood of 10 to 12 psi your ls2 has higher compression then my lq4 if you still have the 243s and stock bottom end

 

I ran a MPGT45 on a 6.0 and it worked good. Instant boost, 15psi.
Might not be optimal but it worked.

 

What size wastegate and psi spring did you run?

 

Tial 44mm and a 15psi spring, or 1 bar I believe it was. actually 14.50psi or something like that