Originally Posted by Silverarrow

This is what we also experienced. That is why I bought the closed fuel rail from Bruce at TTM with the 550cc injectors. Now I can see that the pressure is constantly beteende 56-57PSI and the AFR is still around 10.1-10.3.
The car is still not tuned properly because we are having issues with the MAP sensor which seems to give a CEL. Rob has just sent a new one so lets see if this solves the problem. We dont seem to get higher boost then 15psi Even though we are running the 61mm pulley. The map sensor seems to read the atmospherical pressure wrong, the diagnostic is saying "unreasnible atmospherical pressure value"

Will also do a intake pressure test next week.

/Adam