Duty cycle issue...

[ManicMike]

Had my car on the dyno yesterday and it was doing good on low boost (12 psi/18degs (yes, verified actual vs commanded)).. ended up at 540whp. After that it didn't seem to pick up much per psi (ended at 615whp, 22psi/12 degs), noticed IDC was high (130%) but VE table was not excessive. Cranked base pressure to 60psi vs 43psi.. didn't help. Still high IDC. At this point I'm not sure if it's a injector issue (80 lbs siemens deka's) or fuel pump (AEM external 380 lph). Not logged, but was watching fuel pressure gauge on regulator, and it rose and held to end of pull.


Basic rundown.
MS3 Goldbox (1.4.1 FW) with micro TCU (1.0.1 FW)
88/83 T4 Turbo
LJMS Stage 2 cam with BTR .660 springs and pushrods
24x 5.3 LS
80 lb injectors
AEM 380 lph fuel pump
-8 feed and -6 return
100 micron pre filter
10 micron post filter

Included the last pull log. I don't have the tune on this pc, can add it when I get home.

[Valeriy]

Add your MSD tune please here .

[tryingbe]

From the log, the engine is clearly running out of injectors.
What type of fuel were you using?
I noticed your battery voltage is dropping from 14.0v to 13.1v by the end of the dyno.
What voltage do you get at the fuel pump when the car is running?
Have you tested your fuel system for flow? The way I test my system is have the return hose goes into a gallon container, then the fuel pump on for 30 seconds, then use math to get litre per hours for flow. Let's say you get 2.5 qt*, 2.5qt x 120 = 300 qt per hour of flow, then, divided it again by 1.05669 and you'll get 283.90 litre per hour.
Then, you can bump up the fuel pressure and do the test again, higher fuel pressure = lower fuel flow.

[jsmcortina]

That's a good way to test and is thoroughly recommended. You can apply regulated compressed air to the pressure regulator to mimic boost.

James