C-Kwik wrote:Why is everyone here so quick to want to flame someone?
Because you SUCK!!! Now please, try to figure out when to die.(That's a joke btw

) Yoyo, I appologize for overreacting, C-Kwik is right, I misunderstood your post. That's the problem with the internet, it's easy to misinterpret what someone said so once again, sorry.
What I was going to say was that the wastegate acts as a vent of sorts for the turbo, it allows exhaust gasses to bypass the turbo, hence keeping the turbo from spooling up any more because there is an inadequate amount of exhaust gas for it to do so. Actually, if you have a wastegate that is too small then even when it opens fully the exhaust gasses cannot bypass the turbo enough and it continues to spool and hence, increase boost. This is frequently a problem with larger, internally gated turbos and is one of the reasons that externally wastegate setups are preferred. The wastegate is actuated by a vacuum line that takes it's signal from the intake manifold, basically when the turbo increases the pressure high enough in the intake manifold that same pressure makes it's way to the wastegate and in effect, pushes it open allowing the turbo to maintain a set level of boost. The level of boost is directly related to how stiff the spring in the wastegate is, a stiffer spring and it'll open later and allow the turbo to boost higher, a lighter spring and it'll open earlier stopping the turbo from boosting as high. What an electronic boost controller does is use a solenoid that basically actuates a valve in that vacuum line between the intake manifold and wastegate to limit the signal that the wastegate sees. An electronic boost controller can vary the amount that the valve allows through to adjust the boost on the fly and to adjust for boost spikes. A manual boost controller does the same thing, however it is not adjustable from in the ****pit because you manually have to tighten or loosen the valve, this is also why an MBC cannot react to boost spikes like an EBC can. Hopefully you can now see that because of how a boost controller works, it is not possible for it to vent any more exhaust gasses than the wastegate will allow. This also means that whatever spring is in your wastegate (for example, 7psi, 10psi, 15psi, etc.) you can never set the boost lower than that with an EBC because it cannot vent anything. The only thing capable of venting excess air in a turbo/intake system is the blow off valve, this is also actuated by a vacuum line off of the intake manifold. All a BOV does is open and allow compressed air to escape the intake system when the throttle butterfly is closed and a vacuum situation is encountered, such as when shifting or quickly closing the throttle at high rpms. This is done so that the turbo does not experience backpressure from the intake charge slamming up against the throttle butterfly with nowhere to go. Not only does it help keep the turbo spooled for the next gear (in a shifting situation) but it also prevents the turbo from being hurt by the sudden stoppage of airflow. I hope this explanation was thorough enough and not confusing, I'm pretty tired and probably not making much sense so if anything is confusing/wrong then you can call me on it
No hard feelings I hope!