Turbo BS Thread

Does the target boost have any influence on spring pressures? I would not think so. Cam lift and Max. RPM would be what I expect influence spring pressure needs. Consult your camshaft specs or manufacturer.

 

Boost does influence spring choice because there's pressure on the back of the valve effectively canceling some of the spring force that would otherwise be available to close the valve. 20psi on the back of a 38mm valve is about 35lbs of force.

 

I think that may be a wholesale price because it's similar to what I saw on Aliexpress for orders with a minimum quantity.

 

Of course, makes sense, is pressure on back of both the intake and the exhaust. Not sure how long it might have taken me ot realize that, but Of Course.

 

You can run off spring alone if no boost reference is added to the wastegate. Would be trial and error to dial it in unless someone has the same WG and runs same boost as your target.