After some recent mods, I noticed by manifold boost pressure is not reaching target levels as the rpms climb. I found some very interesting info in this thread http://rennlist.com/forums/997-turbo...s-it-safe.html
about the ECU effectively capping power. My car is reaching target boost levels pre throttle, but post throttle the pressure is bleeding off. I performed a boost leak test from turbo outlet to turbo outlet and everything was holding pressure up to 22.5 psi. The logs back this up showing pre throttle boost pressure at or above target levels, only after the throttle and at upper rpms does the post throttle pressure drop.
The turbos are capable of producing 20+ psi and the manifold is capable of containing it as witnessed by the log showing between 19 and 21 psi from ~3800 to ~4000 rpm as the pull starts.
2008 997 turbo cab 6MT
Cobb Stage 2 93 octane OTS tune
do88 inlets, ICs, and y-pipe
FVD headers and catted exhaust
Max IAT 77* F
0 knock retard
Full log here:
zoomed log here:
What say those wiser than I? Boost leak in the manifold? Weak/leaking diverter valves? ECU shenanigans?