Have stage 1+ Motoza tune and decided to buy forge 008 (swapped base spring for next firmer since I am planning on 17 - 20 psi boost) and new n75(E) valve, and new cooler plugs from ECS. Installed all and went for ride.

Idles smoother, but on wot it will not go beyond 7 psi boost. I was getting around 13 psi before I changed the hardware. Would installing the diverter valve or n75 backwards cause this (I am trying to look at big picture first.

Did I install something backwards...)? Of course I think things are installed right, but would a gross mistake like swapping the inlet/outlet on either the diverter or n75 give this symptom of no boost past stock?

I ran the logging on Motoza software, and the requested boost is around 15 psi, but actual is reading 6 or 7 like I said. So it is not tune related, it is something I messed up but I do not know what.

I wanted to upgrade/replace these parts before installing the snow WMI kit and new tune file from Motoza and now I am bummed because the car rides like it did before getting the tune. Smooth and nice, but no grunt!

Any guess on what might be wrong?

 

I installed the n75 in wrong orientation. Fixed it today and now all is well again.