the Greddy Profec B electronic controller and the TurboXS for a manual controller.
do i need both of them in order to work, is it really need for turbo's car ? can i run without them ? if so how can i change my boost
thanks

 

You only need one of the boost controllers to control boost not both. If you run without one, boost will be whatever the wastegate spring is. So if you have to find out what your wastegate comes with if you don't plan on using a boost controller.

The downside is you can't control boost without a boost controller. Even if you get a boost controller, you can only boost up and not down. The lowest boost you will have is the spring in the wastegate.

 

have any idea of what's the lowerest boost on tial 35 mm ?

 

That would depend on what spring it has.

Available spring pressure: .3Bar (4.35psi), .45Bar (6.53 psi), .65Bar (9.43 psi), .8Bar (11.60 psi)
High Pressure Spring Pressures available .95Bar 13.78 psi), 1.1Bar (15.95 psi), 1.35Bar (19.58 psi), 1.5Bar (21.75 psi)