well i finaly got my car running but my turbo is not boosting really to speak of my bov is going off but on the stock gauge it only gets to alittle above 0 and on the after market gauge the same its a s5 ported manifold and wastegate on a s4 motor any ideas i dont think its the fitting although all the emissions were taken off by the motors previous owner so the new fitting is a semi loose nipple on the side of the intake manifold it shows good vac on both gauges just no boost. plz help if posible

 

bump plz if you have any ideas is it posible somthing with the waste gate ?

 

what are your mods? What type of exhaust?

 

I gather that you have a S4 car with a S5 exhaust manifold.

The S4 computer and manifold controll boost different than a S5. The S4 uses a Twin scroll system. There is a flapper in the S4 manifold controlled by the actuator valve that helps the turbo spool up. The S5 controlls boost with a different wastegate solinoid controll valve. With all that said, you can an run a S5 manifold if you have a aftermarket boost control vave like a ACVR. You can find more information by comaparing the S4 vaccum drawings to the S5 drawings. Try a search on twin scroll.