24psigti

Engine has ~ 41k

Chipped (EPL)
Samco TBB
710n's

Over the past few months I have been losing boost. I now spike 15 at the most and as soon as it spikes it drops to 10-12. I cannot recall what the numbers used to be, but they were quite a bit higher than now.

I have not done a pressure leak test yet and that is my next plan.

I did the 40k mile service 1500 miles ago and havn't had a chance to change the fuel filter.

Could the old fuel filter be causing the loss in performance?

Also, after searching I found that I need to check requested vs. actual boost on the vag. Which blocks are these in?

WindyCityS4

15 psi taper to 12 psi sounds about right for my MTM chip in the winter (40 degree F and lower).

If you are in a climate without cooler winters, then it might be a leak.

24psigti

I am in North Carolina all year except the summers when I go back to Connecticut. This problem happened when there was still a moderate to warm climate.

I will check for leaks. Thanks for the suggestion.