External wg mbc questions
 

Hi,
I have a few q's about external wg boost control:
I am running an ssac external wg, I am controlling boost via a ball spring valve, using the bottom port of the wg. I currently have a 3.6 psi spring in there. My question is, If I switch to using the top port of the gate with the ball/spring valve, would it be better to use the 3.6 psi spring, or should I change it out for the 5.6 psi spring I have. I am hoping that changing to a stiffer spring along with switching to using the top port for boost control will solve my issues with huge boost spikes. I have also read that using the top port may minimize the spikes as opposed to my current way of controlling boost.
What do you guys think??

Re: External wg mbc questions
 

just leave it on the bottom where it belongs. if your using a cheepie boost controller that is brobably the problem :y

Re: External wg mbc questions
 

the whole on top is for a second stage i believe

Re: External wg mbc questions
 

i thought you could put a small amount of boost to the top hole to control it. the higher the boost on the top port the higher boost the engine sees.

Re: External wg mbc questions
 

I am using a pressure relief valve from grainger. I don't think that it is the problem.
I want add pressure to the top port of the gate to create an opposing pressure, thus necessitating more pressure to open my wastegate, similar to what was outlined here->> https://www.homemadeturbo.com/forum/...?topic=73405.0
I really just want to know if it would be better to run the 5.6psi spring to level out the boost spikes.

ha, yeah, I was looking up that tech article^^^ as you were typing.

Re: External wg mbc questions
 

from what i have read, you want to use the stiffest spring possible. basiclly if your low boost setting is 10psi and your high boost setting is 15psi then use a 10psi spring and a boost controller to get the 15psi. i hope that makes sence