I finally finished my setup and found time to get dyno tuned. I want to leave my tuner out of this discussion because I don't like the public "judging" that sometimes happens on forums. He's been doing this a VERY long time and more importantly, is a decent human being. Back on topic. My setup:

Stock block.
Induction: Vortech Si trim blower with silicon intakes heat exchanger, mezzier water pump. The blower had no miles since the Si trim upgrade.
Fuel: 900cc FIC injectors, aem fuel pump with relay rewire.
anti detonation: Devils own meth kit with aem failsafe. I was running their number 7 nozzle that flowed 560 ml/min. It's rated at 441 mL/min however I increased the pump's pressure to maximum and flow rates were checked with a graduated cylinder and stopwatch and confirmed by the aem failsafe.
exhaust: Stock exhaust, berk HFC
dynojet dyno.

Results:
The aem pump failed on the dyno. I was very disappointed with that. This was a brand new pump whose only mileage was the trip to the dyno. Threw an aeromotive in there and all was good. whp was 404. Boost was 17.5 psi at 9k. Injectors were at 95% duty cycle, afr were 11.7-11.5. So the motor was making the boost it should of, the injectors were at where they should of been for the cfm of the blower, and the afr were also good, however the power just wasn't there. Added some timing and the motor didn't add appreciable power. It appears I did get some exhaust valve float at higher rpm so I'm upgrading to supertech dual spring valve train. Gonna check my cat, do another compression check and leakdown test later. Any ideas why the power wasn't there.

I did a leak down of the motor before the dyno session and all cylinders were 6% or less.

 

How do you know?

 

Aeromotive 340 pump with 900cc injectors and the stock fuel pressure regulator? If so, you need to check your base fuel pressure... I bet its too high. I had a similar fuel setup on my CT supercharger (Aeromotive 340, ID1000's, stock FPR) and my base fuel pressure was 64 psi which caused all kinds of havoc with my top-end power. Replaced the stock FPR with the AEM FPR (largest gold orifice installed) and the base fuel pressure was back down to 43 psi and my tuner said it was easy to get the power that he expected out of the car after that. Because the base pressure was so high, when the injectors got to firing quicker the rail pressure actually dropped, causing tuning issues.

 

Regarding valve float:
The exhaust became scarey loud at peak higher rpm and lots of sooty smoke out of the exhaust.

Fuel pressure:
43 psi without vacuum and 40 psi with vacuum. Going to put an AEM fpr on anyhow.

 

How did you check your fuel pressure? Do you have a gauge tapped into the rail?

I get sooty smoke out the back of my car at full throttle pulls... didn't know that was a bad thing? I have no cat.

 

Sorry for the poor details. Have a summit gauge with oil on the fuel rail. I drilled a pressure relief hole on the stock fpr and used a B&M to raise to stock Fuel pressure. I ordered a test pipe too. Gonna dyno with that as well.

The sound was a louder change during the dyno run. The whole shop stopped and looked it was THAT loud.

 

If exhaust gets LOUD...its usually floating valves. Same thing happened to a gsr my brother bought. Some asshat before him put the wrong springs(possibly just the outer springs) in the head, so at 8k the exhaust got really loud and power fell drastically.

Sent from my Samsung Galaxy S4

 

What does the power curve look like? If you're getting valve float the curve would drop off when it started occurring. My curve and most other SC curves I've seen are straight linear all the way to the end.

 

Rail pressure will only drop if the fuel pump can't keep up. How much boost were you running?

 

The power did drop off up top. So everything appears consistent with valve float. Still, it didn't appear I dropped off *that* much to account for approx 60 whp which I think this setup should at least be good for.

Ironic part is I recently swapped all the retainers and new valve seals. Had I known I'd of upgraded the valve springs while there. Live and learn.

Boost was approx 17.5 psi at 9k

I'm going to re-dyno but not until I get the valve train upgraded. Supertech dual springs kit has already been ordered.