Its just a warmup turbo. Remember my original setup was an Ebay turbo, pretty large one, but still ebay turbo. You can stay forever with your warmup turbo unless it decides to blow up.
It does sound like there was some power on the table with AFR more like a 12.5-12.9 and other things you mentioned. It is cool going on a dyno at the start, then being able to hit the dyno with turbo.
6 cylinders can make about as much HP as they have # of injector x10. That is if you run a real EMS setup.
The Duster on E70 and 47# injectors ran out of fuel with megasquirt at 13 or 14 pounds (that was with supplemental 100% methanol in 2500cc flavor. On Rising Rate regulator, and only 33# injectors, it did not run out of injector, but out of fuel pump above 20psi. :P The pump was okay most of the time but you need to have a large margin of safety on your pump for those times it bogs down.
Everyone should know that from watching me go boom boom.
300whp is possible on those injectors he has. With increased fuel pressure he can probably make a lot more if he has enough fuel pump. Hotwire the pump and you have more to play with. I also suggest blocking off the bypass without breaking the pump in the process like I JUST did.
There is also a huge difference between running out of fuel injector according to megasquirt, and actually running out of fuel and going boom boom. I was running 9+ millisecond pulse widths so that is why I decided I was out of fuel on Megasquirt. Not that I can remember now why 9 milliseconds is the limit.