2LiterTurboSeR

Running a 44mm wastegate on my setup, I have been told that if I am running a Manual Boost Controller, that the MBC won't be able to change the boost if I am running anything over what the wastegate spring is at?

Reason being, I want a 10 psi spring, no wastegate when I'm just cruising around at 6 psi, and then turn the boost up to 15+ when I'm racing. I want to be able to turn the boost up, and I've been told I can't. Is this true?

Also, what is the advantage of a larger psi wastegate spring? No one I know seems to be able to explain this to me.

Thanks!

beepy

You can increase boost over what the wastegate is rated at but cannot reduce it.

So if you have a 10 PSI spring you will run 10 PSI with no MBC. With a MBC you can easily turn it up to 15 PSI. However, you cannot turn it down to 6 PSI.

A MBC can only increase boost about 50% over the spring rating safely, so you want a larger spring if you are going to run more boost.

vaporboy12

im running a 9psi spring and boosting 20psi+ witha mbc no problem here