Not Boosting over 7psi

[mr299ron]

Take a breath mate!

I'm not entirely sure if you understand how the boost control circuit works or not, in some posts you seem to get in but then in others you seem confused about it.

Just to clarify (disregard the vsv for a moment), boost pressure is controlled by the wastegate actuator, once boot pressure reaches the required pressure to overcome the spring inside the actuator it will move thus opening the wastegate and regulate boost. This is how boost is controlled when cold and the vsv shut.

The vsv operation is nothing to do with boost creep or boost spikes, those are two different phenomenon which can occur with turbo setups.
So when 'hot' the VSV is open, by bleeding off a small amount of air (via the VSV) a higher boost pressure is now required to overcome the actuator spring (needs to compensate for the loss in pressure via VSV).

I'm not sure if people run a mbc with the VSV still connected or not as i'm new to 3SGTE engines (had c20lets before) but if you were to remove it from the boost control circuit and just use a mbc then whatever you set that to is what you will get. Depending on whether you use a bleed valve type or dawes device (ball and spring) you may get a boost spike then if setup wrong.

Yeah I get it dude that's why I created a seperate post lol. I couldn't find my issue anywhere, so I've tried to understand how it all works to see if I can troubleshoot it myself.

Thanks for the reply though bud

99ron