Well, I've been having a lot of problems with going past 4k rpms or making .5bars of boost. I borrowed my friends commander and set it to watch my injector duty cycle. Giving it about 40% throttle (staying off boost) I watch the cycle clime higher and higher. The second I hit the 4k mark all of a sudden it drops instantly to half of where it was at. I know the secondaries are kicking on, but is it supposed to be illustrated like that? Should I be seeing a solid build up to 8k? Whats the cause of the inj duty to drop like that?

 

If your engine only boosts to 4K then drops on it's face, there is no need for more fuel. Thus the injectors would drop off.


I suggest your friend watches both boost and inj duty and see if both drop off together.